Technical guide V - TECHNOLOGIES BEARING SYSTEMS tropical environment. In particular, protection against humidity complies with norm NFC20703 (test 3B 21 days) # MIL STD 202* methode 103B. CODE 14 - The reference is followed by 3 digits. They are allocated to each individual case. This requirement is always produced to customers’ specification. It is suitable for fans to operate in temperatures lower than - 10°C and higher than + 70°C or in special environmental conditions. CODE 17 - This manufacturing method could apply to marine specifications. • Salt spray protection (non operating) E 507 specification issued by RCPM. Paragraph 3-21. Severity 6. • Dry heat (non operating) E 507 specification issued by RCPM-Paragraph 3-21. Severity 5. • Damp heat (operating) NFC 20703 specification (severity 5 Ref.3B) # MIL STD 202* methode 103B. • Shocks (operating) NFC 20727 specification (test 8B. Severity 30 A / 30 g - 11 ms) # MIL STD 202* methode 213B. • Vibrations (operating) E508 specification issued by RCPM. Paragraph 2-32 (23 Hz; +- 1 mm, 1 hour) This manufacturing method applies to most of ball-bearing fan versions. The fan rotors are equipped with two sleeve bearings or 2 sealed ball bearings lubricated for life, according to the required life expectancy, noise level and environmental conditions. They can also be equipped with mixed bearings. Shielded, stainless steel bearings, very high temperature grease are available for extended temperature range. DESIGN CODE Our fans can be made in accordance with four internal manufacturing codes which are identified as follows: a) according to the maximum air temperature at the inlet of the fan b) according to the climatic environment (humidity, tropical surroundings,etc.) The manufacturing methods are coded as follows: CODE 11 - Suitable for fans to operate in an atmosphere without special humidity conditions. CODE 13 - Suitable for fans to operate in an atmosphere between - 10°C and + 70°C in humid VI - OPTIONS DEGREES OF PROTECTION - IP rotation will vary according to the ambient temperature. For more information regarding the VARIOSPEED Fans, please consult factory. ETRI supplies a full range of AC and BDC fans offering high level of protection against dust or water. Most of our standard models, and all our high performance fans are available with protection for use in specific conditions, up to IP55 environments. SPEED SENSORS AND ALARM SIGNALS Most ETRI DC and AC Fans feature a speed sensor that detects number of pulses per revolution, or a rotation detector (on/off signal) which indicates if the fan works correctly. These options are codified as follow: Speed sensor: 3 - Eg.: 280DH2LP13000 Alarm: 4 - Eg.: 280DH2LP14000 ETRI provides also a full range of alarm box (relay + dry contact) to read directly the signal of the speed sensor or alarm output (see pages 164-166). For more information regarding the protection levels, see the corresponding table page 170. VARIABLE SPEED The "VARIOSPEED" option is now available on some BDC series. With this option, the speed CONVERGIE Group • Website: www.etrinet.com 8 • E-mail: [email protected]