K3G250-AV29-B2 Operating instructions ebm-papst Mulfingen GmbH & Co. KG Bachmühle 2 D-74673 Mulfingen Phone +49 (0) 7938 81-0 Fax +49 (0) 7938 81-110 [email protected] www.ebmpapst.com 1. SAFETY REGULATIONS AND NOTES Please read these operating instructions carefully before starting to work with the device. Observe the following warnings to prevent malfunctions or physical damage to both property and people. These operating instructions are to be regarded as part of this device. If the device is sold or transferred, the operating instructions must accompany it. These operating instructions may be duplicated and forwarded for information about potential dangers and their prevention. Translation of the original operating instructions CONTENTS 1. SAFETY REGULATIONS AND NOTES 1 1.1 Levels of hazard warnings 1 1.2 Staff qualification 1 1.3 Basic safety rules 1 1.4 Electrical voltage 1 1.5 Safety and protective functions 2 1.6 Electromagnetic radiation 2 1.7 Mechanical movement 2 1.8 Emission 2 1.9 Hot surface 2 1.10 Transport 2 1.11 Storage 2 1.12 Disposal 2 2. PROPER USE 3 3. TECHNICAL DATA 4 3.1 Product drawing 4 3.2 Nominal data 5 3.3 Data according to ErP directive 5 3.4 Technical features 5 3.5 Mounting data 5 3.6 Transport and storage conditions 5 3.7 Electromagnetic compatibility 6 1.3 Basic safety rules 4. CONNECTION AND START-UP 6 4.1 Connecting the mechanical system 6 Any safety hazards stemming from the device must be re-evaluated once it is installed in the end device. Observe the following when working on the unit: 4.2 Connecting the electrical system 6 4.3 Connection in terminal box 7 4.4 Factory settings 8 4.5 Connection screen 9 4.6 Checking the connections 10 ; Check the electrical equipment of the device at regular intervals, refer to chapter 6.2 Safety test. 4.7 Switch on device 10 ; Replace loose connections and defective cables immediately. 4.8 Switching off the device 10 5. INTEGRATED PROTECTIVE FUNCTIONS 10 6. MAINTENANCE, MALFUNCTIONS, POSSIBLE CAUSES AND REMEDIES 11 6.1 Cleaning 11 6.2 Safety test 11 1.1 Levels of hazard warnings These operating instructions use the following hazard levels to indicate potentially hazardous situations and important safety regulations: DANGER Indicates an imminently hazardous situation which, if not avoided, will result in death or serious injury. Compliance with the measures is mandatory. WARNING Indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury. Exercise extreme caution while working. CAUTION Indicates a potentially hazardous situation which, if not avoided, may result in minor or moderate injury or damage of property. NOTE A potentially harmful situation can occur and, if not avoided, can lead to property damage. 1.2 Staff qualification The device may only be transported, unpacked, installed, operated, maintained and otherwise used by qualified, trained and authorised technical staff. Only authorised specialists are permitted to install the device, to carry out a test run and to perform work on the electrical installation. ; Do not make any modifications, additions or conversions to the device without the approval of ebm-papst. 1.4 Electrical voltage DANGER Electrical load on the device Risk of electric shock → Stand on a rubber mat if you are working on an electrically charged device. WARNING Terminals and connections have voltage even with a unit that is shut off Electric shock → Wait five minutes after disconnecting the voltage at all poles before opening the device. Item no. 50679-5-9970 · Revision 82546 · Release 2014-05-08 · Page 1 / 12 ebm-papst Mulfingen GmbH & Co. KG · Bachmühle 2 · D-74673 Mulfingen · Phone +49 (0) 7938 81-0 · Fax +49 (0) 7938 81-110 · [email protected] · www.ebmpapst.com K3G250-AV29-B2 Operating instructions CAUTION In the event of failure, there is electric voltage at the rotor and impeller The rotor and impeller are base insulated. → Do not touch the rotor and impeller once they are installed. → Protect long hair by wearing a cap. 1.8 Emission CAUTION If control voltage is applied or a speed setpoint is stored, the motor automatically restarts, e.g. after a power failure. Danger of injury WARNING Depending on the installation and operating conditions, a sound pressure level greater than 70 dB(A) may arise. Danger of noise-induced hearing loss → Keep out of the danger zone of the device. → Take appropriate technical safety measures. → When working on the device, switch off the mains supply voltage and secure the latter from being switched on again. → Protect operating personnel with appropriate safety equipment, e.g. hearing protection. → Wait until the device stops. → After working on the device, remove any used tools or other objects from the device. 1.5 Safety and protective functions DANGER Missing safety device and non-functioning safety device If there is no safety device, you could be seriously injured, for example if you reach into the running device or your hands are sucked into it. → Operate the device only with a fixed and isolating safety protection and a fixed guard grille. The guard must withstand the kinetic energy of a fan blade detaching at maximum speed. → The device is a built-in component. You, the owner/ operator, are responsible for providing adequate protection for the device. → Shut down the device immediately if you detect a missing or ineffective protective feature. 1.6 Electromagnetic radiation Interference from electromagnetic radiation is possible, e.g. in conjunction with open and closed-loop control devices. If unacceptable emission intensities occur when the fan is installed, appropriate shielding measures have to be taken by the user. Translation of the original operating instructions → Do not wear any loose clothing or jewellery while working on rotating parts. NOTE Electrical or electromagnetic interferences after integrating the device in installations on the customer's side. → Verify that the entire setup is EMC compliant. 1.7 Mechanical movement DANGER Rotating device Body parts that come into contact with the rotor and impeller can be injured. → Also observe the requirements of local agencies. 1.9 Hot surface CAUTION High temperature at the electronics enclosure Danger of burn injuries → Ensure that sufficient protection against accidental contact is provided. 1.10 Transport NOTE Transport of device → Transport the device in its original packaging only. → Secure the device so that it does not slip, e.g. by using a clamping strap. 1.11 Storage ; Store the device, partially or fully assembled, in a dry and weatherproof manner in the original packing in a clean environment. ; Protect the device from environmental impacts and dirt until the final installation. ; We recommend storing the device for a maximum up to one year to guarantee proper operation and longest possible service life. ; Even devices explicitly suited for outdoor use are to be stored as described prior to being commissioned. ; Maintain the storage temperature, see chapter 3.6 Transport and storage conditions. ; Please make sure that all screwed cable glands are fitted with dummy plugs. 1.12 Disposal When disposing of the device, please comply with all relevant requirements and regulations applicable in your country. → Secure the device against accidental contact. → Before working on the system/machine, wait until all parts have come to a standstill. WARNING Rotating device Long hair, loose items of clothing and jewellery could become entangled and pulled into the device. You could be injured. Item no. 50679-5-9970 · Revision 82546 · Release 2014-05-08 · Page 2 / 12 ebm-papst Mulfingen GmbH & Co. KG · Bachmühle 2 · D-74673 Mulfingen · Phone +49 (0) 7938 81-0 · Fax +49 (0) 7938 81-110 · [email protected] · www.ebmpapst.com K3G250-AV29-B2 Operating instructions 2. PROPER USE The device is exclusively designed as a built-in device for moving air according to its technical data. Any other or secondary use is deemed improper and constitutes a misuse of the device. Installations on the customer's side must meet the mechanical, thermal and service life-related stresses that can occur. Proper use also includes: ● Moving air with a density of 1.2 kg/m³. ● Using the device in accordance with the permitted ambient temperature, see chapter 3.6 Transport and storage conditions and chapter 3.2 Nominal data. ● Operating the device with all protective features in place. ● Minding the operating instructions. Improper use Using the device in the following ways is particularly prohibited and may cause hazards: Operating the device with an imbalance, e.g. caused by dirt deposits or icing. ● Opening the terminal box during operation. ● Moving air that contains abrasive particles. ● Moving highly corrosive air, e.g. salt spray mist. Exceptions are devices that are intended for salt spray mist and protected accordingly. ● Moving air that contains dust pollution, e.g. suctioning off saw dust. ● Operating the device close to flammable materials or components. ● Operating the device in an explosive atmosphere. ● Using the device as a safety component or for taking on safetyrelated functions. ● Operation with completely or partially disassembled or modified protective features. ● In addition, all application options that are not listed under proper use. Translation of the original operating instructions ● Item no. 50679-5-9970 · Revision 82546 · Release 2014-05-08 · Page 3 / 12 ebm-papst Mulfingen GmbH & Co. KG · Bachmühle 2 · D-74673 Mulfingen · Phone +49 (0) 7938 81-0 · Fax +49 (0) 7938 81-110 · [email protected] · www.ebmpapst.com K3G250-AV29-B2 Operating instructions 3. TECHNICAL DATA 3.1 Product drawing All measures have the unit mm. Cable diameter: min. 4 mm, max. 10 mm; tightening torque: 2.5±0.4 Nm Inlet nozzle with bleeder connection for pressure relief (k-factor: 70) Tightening torque 3.5±0.5 Nm Translation of the original operating instructions 1 2 3 Item no. 50679-5-9970 · Revision 82546 · Release 2014-05-08 · Page 4 / 12 ebm-papst Mulfingen GmbH & Co. KG · Bachmühle 2 · D-74673 Mulfingen · Phone +49 (0) 7938 81-0 · Fax +49 (0) 7938 81-110 · [email protected] · www.ebmpapst.com Operating instructions K3G250-AV29-B2 Mounting position 3.2 Nominal data Motor M3G084-FA Phase Nominal voltage / VAC Nominal voltage range / VAC Frequency / Hz 1~ 230 200 .. 277 Type of data definition Speed / min-1 Power input / W Current draw / A Min. ambient temperature / °C Max. ambient temperature / °C ml 3450 750 3.3 -25 Condensate discharge holes Operation mode Motor bearing Technical features 50/60 40 ml = Max. load · me = Max. efficiency · fa = Running at free air cs = Customer specs · cu = Customer unit Subject to alterations 3.3 Data according to ErP directive Installation category Efficiency category Variable speed drive Specific ratio* * Touch current acc. IEC 60990 (measuring network Fig. 4, TN system) Electrical leads Motor protection A Static Yes 1.01 Specific ratio = 1 + pfs / 100 000 Pa Actual Overall efficiency ηes / % Efficiency grade N Power input Ped / kW Air flow qv / m³/h Pressure increase total psf / Pa Speed n / min-1 62.5 74.3 0.75 1755 889 3490 Request 2013 46.2 58 Request 2015 50.2 62 Data definition with optimum efficiency. Translation of the original operating instructions The ErP data is determined using a motor-impeller combination in a standardised measurement configuration. 3.4 Technical features Mass Size Surface of rotor Material of electronics housing Material of impeller Material of mounting plate Material of support bracket Material of inlet nozzle Number of blades Direction of rotation Type of protection Insulation class Humidity class 10.1 kg 250 mm Coated in black Die-cast aluminium Aluminium sheet Sheet steel, galvanised Steel, coated in black Sheet steel, galvanised 7 Clockwise, seen on rotor IP 54 "B" F3-1 Protection class Product conforming to standard Approval Shaft horizontal or rotor on bottom; rotor on top on request Rotor-side S1 Ball bearing - Output 10 VDC, max. 10 mA - Output 20 VDC, max. 50 mA - Output for slave 0-10 V - Input for sensor 0-10 V or 4-20 mA - Alarm relay - Motor current limit - PFC, active - RS485 MODBUS RTU - Soft start - Control input 0-10 VDC / PWM - Control interface with SELV potential safely disconnected from the mains - Over-temperature protected electronics / motor - Line undervoltage / phase failure detection <= 3.5 mA Via terminal box Thermal overload protector (TOP) wired internally I (if protective earth is connected by customer at the connection point of the housing) EN 61800-5-1; CE CCC; EAC For cyclic speed loads, note that the rotating parts of the device are designed for maximum one million load cycles. If you have specific questions, contact ebm-papst for support. 3.5 Mounting data ; Secure the mounting screws against accidentally coming loose (e.g. by using self-locking screws). Strength class for mounting screws 8.8 You can obtain additional mounting data from the product drawing if necessary. 3.6 Transport and storage conditions ; Use the device in accordance with its protection type. Max. permissible ambient motor temp. (transp./ storage) Min. permissible ambient motor temp. (transp./storage) +80 °C -40 °C Item no. 50679-5-9970 · Revision 82546 · Release 2014-05-08 · Page 5 / 12 ebm-papst Mulfingen GmbH & Co. KG · Bachmühle 2 · D-74673 Mulfingen · Phone +49 (0) 7938 81-0 · Fax +49 (0) 7938 81-110 · [email protected] · www.ebmpapst.com Operating instructions K3G250-AV29-B2 3.7 Electromagnetic compatibility 4. CONNECTION AND START-UP EMC interference immunity EMC harmonics EMC interference emission 4.1 Connecting the mechanical system Acc. to EN 61000-6-2 (industrial environment) Acc. to EN 61000-3-2/3 Acc. to EN 55022 (Class B, household environment) CAUTION Cutting and crushing hazard when removing the fan from the packaging → Carefully remove the fan from its packaging. Make sure to avoid any shock. → Wear safety shoes and cut-resistant safety gloves. CAUTION Heavy load when taking out the device Bodily harm, e.g. back injuries, are possible. → Two people should remove the device out of its packaging together. ; Check the device for transport damage. Damaged devices must no longer be installed. ; Install the undamaged device according to your application. 4.2 Connecting the electrical system DANGER Electric voltage on the device Electric shock → Always install a protective earth first. → Check the protective earth. DANGER Incorrect insulation Risk of fatal injury from electric shock → Use only cables that meet the specified installation requirements for voltage, current, insulation material, load etc. → Route cables such that they cannot be touched by any rotating parts. CAUTION Electrical voltage The fan is a built-in component and features no electrically isolating switch. Translation of the original operating instructions → Only connect the fan to circuits that can be switched off with an all-pole separating switch. → When working on the fan, you must switch off the installation/machine in which the fan is installed and secure it from being switched on again. NOTE Water penetration into leads or wires Water enters at the cable end on the customers side and can damage the device. → Make sure that the cable end is connected in a dry environment. Connect the device only to circuits that can be switched off using an all-pole disconnecting switch. Item no. 50679-5-9970 · Revision 82546 · Release 2014-05-08 · Page 6 / 12 ebm-papst Mulfingen GmbH & Co. KG · Bachmühle 2 · D-74673 Mulfingen · Phone +49 (0) 7938 81-0 · Fax +49 (0) 7938 81-110 · [email protected] · www.ebmpapst.com K3G250-AV29-B2 Operating instructions 4.2.1 Prerequisites ; Check whether the data on the type plate agree with the connection data. ; Before connecting the device, ensure that the supply voltage matches the operating voltage of the device. ; Only use cables designed for current according to the type plate. For determining the cross-section, follow the basic principles in accordance with EN 61800-5-1. The protective earth must have a cross-section equal to or greater than the outer conductor crosssection. We recommend the use of 105°C cables. Ensure that the minimum cable cross-section is at least AWG26/0.13 mm². Earth wire contact resistance according to EN 61800-5-1 Compliance with the impedance specifications to EN 61800-5-1 for the protective earth circuit must be verified in the end application. Depending on the installation situation, it may be necessary to install an additional protective earthing conductor via the additional protective earth connection point available in the terminal box. 4.3.2 Connecting cables with terminals WARNING Terminals and connections have voltage even with a unit that is shut off Electric shock → Wait five minutes after disconnecting the voltage at all poles before opening the device. ; Remove the cap from the screwed cable gland. Remove the cap only in those places where cables are inserted. ; Insert the line(s) (not included in the standard scope of delivery) into the terminal box. ; Connect the lines to the corresponding terminals. Use a screwdriver to do so. During the connection work, ensure that no cables splice off. 4.2.2 Idle current Because of the EMC filter integrated for compliance with EMC limits (interference emission and interference immunity), idle currents in the mains cable can be measured even when the motor is at a standstill and the mains voltage is switched on. ● The values lie in a range of typical < 250 mA. ● The effective power in this operating state (readiness for operation) is simultaneously at typical < 4 W. 4.2.3 Locked-rotor protection Due to the locked-rotor protection, the start-up current (LRA) is equal to or less than the nominal current (FLA). 4.3 Connection in terminal box Translation of the original operating instructions 4.3.1 Preparing connection lines for the connection Strip the cable just enough so that the screwed cable gland is tight and the terminals are relieved of strain. Tightening torque, see chapter 3.1 Product drawing. Fig. 2: Connecting the wires to terminals ; Seal the terminal box. 4.3.3 Cable routing No water may penetrate along the cable in the direction of the cable gland. When routing the cable, ensure that the screwed cable glands are arranged at the bottom. The cables must always be routed downwards. Fig. 1: Recommended stripping lengths in mm (inside the terminal box) Legend: CL = control lines Item no. 50679-5-9970 · Revision 82546 · Release 2014-05-08 · Page 7 / 12 ebm-papst Mulfingen GmbH & Co. KG · Bachmühle 2 · D-74673 Mulfingen · Phone +49 (0) 7938 81-0 · Fax +49 (0) 7938 81-110 · [email protected] · www.ebmpapst.com Operating instructions K3G250-AV29-B2 Fig. 3: Cable routing for fans installed upright. 4.4 Factory settings Factory settings with which the device is pre-set by ebm-papst. PWM controlling PWM controlling 01 100 8,0 No Analogue (linear) Positive (heating) Positive (heating) Translation of the original operating instructions Control mode parameter set 1 Control mode parameter set 2 Fan / device adress Max. PWM / % Min. PWM / % Save set value to EEPROM Set value control Control function parameter set 1 Control function parameter set 2 Item no. 50679-5-9970 · Revision 82546 · Release 2014-05-08 · Page 8 / 12 ebm-papst Mulfingen GmbH & Co. KG · Bachmühle 2 · D-74673 Mulfingen · Phone +49 (0) 7938 81-0 · Fax +49 (0) 7938 81-110 · [email protected] · www.ebmpapst.com K3G250-AV29-B2 Operating instructions Translation of the original operating instructions 4.5 Connection screen No. PE KL1 KL2 KL2 Conn. 1, 2 1 2 Designation PE N, L NC COM KL2 KL3 3 1 NO OUT KL3 KL3 KL3 2, 8 3, 7 4 GND 0-10 V +10 V KL3 5 +20 V KL3 KL3 KL3 6 9, 11 10, 12 4-20 mA RSB RSA Function / assignment Protective earth connection Supply voltage, 50/60 Hz Floating status message contact, break for failure Floating status message contact, changeover contact, common connection (2 A, max. 250 VAC, min. 10 mA, AC1) Floating status message contact, normally open, make for failure Analogue output, 0-10 VDC, max. 3 mA, SELV, Output of the current motor level control coefficient: 1 V corresponds to 10% level control coefficient, 10 V correspond to 100% level control coefficient. Reference mass for control interface, SELV Use control / actual value input 0-10 VDC, impedance 100 kΩ only as alternative to 4-20 mA input, SELV Voltage output 10 VDC (+/- 3%), max. 10 mA, Supply voltage for ext. devices (e.g. potentiometer), SELV Voltage output 20 VDC (+25%/-10%), max. 50 mA Supply voltage for ext. devices (e.g. sensors), SELV Use control / actual value input 4-20 mA, impedance 100 Ω, only as alternative to 0-10 V input, SELV RS485 interface for MODBUS, RSB RS485 interface for MODBUS, RSA Item no. 50679-5-9970 · Revision 82546 · Release 2014-05-08 · Page 9 / 12 ebm-papst Mulfingen GmbH & Co. KG · Bachmühle 2 · D-74673 Mulfingen · Phone +49 (0) 7938 81-0 · Fax +49 (0) 7938 81-110 · [email protected] · www.ebmpapst.com K3G250-AV29-B2 Operating instructions 4.6 Checking the connections 5. INTEGRATED PROTECTIVE FUNCTIONS ; Make sure that the power is off (all phases). ; Secure it from being switched on again. The integrated protective functions cause the motor to switch off automatically in case of faults described in the table. ; Check the correct fit of the connection lines. Malfunctions ; Screw the terminal box cover closed again. Terminal box tightening torque, see chapter 3.1 Product drawing. ; Route the connecting cables in the terminal box so that the terminal box cover closes without resistance. ; Use all plug screws (the entire number). In doing so, insert the screws manually to avoid damage to the thread. ; Make sure that the terminal box is correctly closed and sealed and that all screws and screwed cable glands are properly tightened. Rotor position detection error Locked rotor Line under-voltage (mains input voltage outside of permitted nominal voltage) Description / Function of safety feature An automatic restart occurs. ; After the blockage is removed, the motor restarts automatically. ; If the mains supply voltage returns to permitted values, the motor restarts automatically. 4.7 Switch on device The device may only be switched on if it has been installed properly and in accordance with its intended use, including the required safety mechanisms and professional electrical connection. This also applies for devices which have already been equipped with plugs and terminals or similar connectors by the customer. WARNING Hot motor housing Fire hazard → Ensure that no combustible or flammable materials are located close to the fan. ; Inspect the device for visible external damage and the proper function of the protective features before switching it on. ; Check the air flow paths of the fan for foreign objects and remove any that are found. ; Apply the nominal voltage to the voltage supply. ; Start the device by changing the input signal. 4.8 Switching off the device Switching off the device during operation: ; Switch off the device via the control input. ; Do not switch the motor (e.g. in cyclic operation) on and off via power supply. Translation of the original operating instructions Switching off the device for maintenance work: ; Switch off the device via the control input. ; Do not switch the motor (e.g. in cyclic operation) on and off via power supply. ; Disconnect the device from the supply voltage. Item no. 50679-5-9970 · Revision 82546 · Release 2014-05-08 · Page 10 / 12 ebm-papst Mulfingen GmbH & Co. KG · Bachmühle 2 · D-74673 Mulfingen · Phone +49 (0) 7938 81-0 · Fax +49 (0) 7938 81-110 · [email protected] · www.ebmpapst.com Operating instructions K3G250-AV29-B2 6. MAINTENANCE, MALFUNCTIONS, POSSIBLE CAUSES AND REMEDIES Overtemperature of electronics/motor Insufficient cooling Do not perform any repairs on your device. Return the device to ebmpapst for repair or replacement. WARNING Terminals and connections have voltage even with a unit that is shut off Electric shock Ambient temperature too high → Wait five minutes after disconnecting the voltage at all poles before opening the device. CAUTION If control voltage is applied or a speed setpoint is stored, the motor automatically restarts, e.g. after a power failure. Danger of injury Unacceptable operating point → Keep out of the danger zone of the device. → When working on the device, switch off the mains supply voltage and secure the latter from being switched on again. → Wait until the device stops. → After working on the device, remove any used tools or other objects from the device. If the device remains out of use for some time, e.g. when in storage, we recommend switching the device on for at least two hours to allow any condensate to evaporate and to move the bearings. Translation of the original operating instructions Malfunction/error Impeller running roughly Motor does not turn Possible cause Imbalance in rotating parts Mechanical blockage Mains supply voltage faulty Faulty connection Thermal overload protector responded Possible remedy Clean the device; if imbalance is still evident after cleaning, replace the device. If you have attached any weight clips during cleaning, make sure to remove them afterwards. Switch off, deenergise, and remove mechanical blockage. Check mains supply voltage, restore power supply, apply control signal. De-energise, correct connection, see connection diagram. Allow motor to cool off, locate and rectify cause of error, if necessary cancel restart lock-out Improve cooling. Let the device cool down. To reset the error message, switch off the mains supply voltage for a min. of 25 s and switch it on again. Reduce the ambient temperature. Reset by reducing control input to 0. Correct the operating point. Let the device cool down. If you have any other problems, contact ebm-papst. 6.1 Cleaning NOTE Damage to the device during cleaning. Malfunction possible → Do not clean the device using a water jet or high-pressure washer. → Do not use any cleaners containing acids, bases or solvents. → Do not use any pointed or sharp-edged objects to clean. 6.2 Safety test NOTE High-voltage test The integrated EMC filter contains Y capacitors. Therefore, the trigger current is exceeded when AC testing voltage is applied. → Test the device with DC voltage when you carry out the high-voltage test required by law. The voltage to be used corresponds to the peak value of the AC voltage required by the standard. What has to be tested? Check the protective casing against accidental contact for damage and to ensure that it is intact Check the device for damage to blades and housing Mounting the connection lines How to test? Frequency Visual inspection At least every 6 months Which measure? Repair or replacement of the device Visual inspection At least every 6 months Replacement of the device Visual inspection At least every 6 months Fasten Item no. 50679-5-9970 · Revision 82546 · Release 2014-05-08 · Page 11 / 12 ebm-papst Mulfingen GmbH & Co. KG · Bachmühle 2 · D-74673 Mulfingen · Phone +49 (0) 7938 81-0 · Fax +49 (0) 7938 81-110 · [email protected] · www.ebmpapst.com K3G250-AV29-B2 Visual inspection At least every 6 months Replace wires Visual inspection At least every 6 months Clean or replace impeller Visual inspection At least every 6 months Retighten, replace if damaged Open bore holes Visual inspection At least every 6 months Translation of the original operating instructions Check the insulation of the wires for damage Impeller for wear/deposits/ corrosion and damage Tightness of screwed cable gland Condensate discharge holes for clogging, as necessary Operating instructions Item no. 50679-5-9970 · Revision 82546 · Release 2014-05-08 · Page 12 / 12 ebm-papst Mulfingen GmbH & Co. KG · Bachmühle 2 · D-74673 Mulfingen · Phone +49 (0) 7938 81-0 · Fax +49 (0) 7938 81-110 · [email protected] · www.ebmpapst.com