PTC Thermistors Temperature Sensors for Motor Protection and Electronics (temperature-sensitive resistors) FEATURES – rapid response protection for electrical machines – compact size for easy assembly into windings – silvered copper leads YD YG YD YG EF YGM YGM TKA TKA 1 1 3 3 1 1 3 1 2 DESCRIPTION PTC thermistors act as thermal protection for electrical machines, and are well known particularly as motor-protectors. They are available with or without insulating sleeve and have flexible connecting leads. PTC thermistors have a non-linear resistance/temperature response, and at a specified temperature the resistance changes rapidly to a very high value. DIMENSIONS PTC-Thermistors 02-02-02 1000-Y-180 YD 1 Single thermistor with shrunk-sleeve YGM 1 Mini-version with shrunk-sleeve YD 3 Triplet version (in series) YGM 3 Mini-version EF 1 Sensor Standard mini threaded CANTHERM 8415 Mountain Sights Avenue • Montreal (Quebec), H4P 2B8, Canada Tel: (514) 739-3274 • 1-800-561-7207 • Fax: (514) 739-290 E-mail : [email protected] • Website: www.cantherm.com Cantherm OPERATION PTC thermistors exhibit very high sensitivity over a narrow temperature band. For temperature measurement in this range, NTC thermistors are easier to measure and more accurate. - PTC’s are classified according to their nominal response temperature qNAT but all have similar resistance characteristics to simplify the choice of switching device; the relationship of resistance to temperature of all these PTC’s is as follows: STANDARD RESISTANCE VALUES PTC thermistors are especially suited as temperature sensors for monitoring the windings of electric machines, and also for use in simple fail-safe circuitry. When a given temperature (nominal response temperature qNAT) is exceeded, the circuit can be switched off through a relay or amplifier, since the PTC-sensor will have an extremely high ohmic value in the region of its response temperature. This will have the same effect as a break in the circuit or a failure of the thermistor. TECHNICAL DATA Temperature °C – 20 to q q q q NAT q NAT Resistance V – 20 –5 NAT measuring Voltage V 250 max./100 max. 2.5 550 max. 2.5 1.000 2.5 NAT +5 1.330 min. 2.5 NAT + 15 4.000 min 7.5 Triple PTC Nominal response temperature 80 ° to 180 °C in steps of 10 °, plus 145 ° and 155 °C Maximum allowable operating temp. Tmax. 200 °C Max. allowable operating voltage at + 25 °C Umax. 25V (per bead) Max. allowable power dissipation at + 25 °C 690 mW Insulation strength (between leads and outer insulation) also for threaded sensor 2.5 kV Conductors - silvered copper wire with teflon insulation PTFE Insulation stripping approx 10 mm Conductor cross-section 0.25 mm for single, double and triple PTC’s 2 CONDUCTOR LENGTHS Single PTC Double PTC Triple PTC Single PTC 500 mm 6 10 mm 500 - 180 - 500 m 6 10 mm 500 - 180 - 180 - 500 mm 6 10 mm Temperature °C – 20 to q q q q NAT Resistance V – 20 measuring Voltage V 750 max./300 max. 7.5 NAT –5 1.650 max. 7.5 NAT +5 4.000 min. 7.5 NAT + 15 4.000 min.* 7.5 * one PTC might reach qNAT + 15 °C, while the second or even both of the others could still remain at room temperature. The PTC’s resistance values for motor protection are specified in DIN 44081/44082. Resistance values below qNAT –20 are not specified, and resistance when cold is no indication of the PTC’s condition. It is ideally between 40 - 200 ohms but can be anywhere between 35 - 250 ohms. The greatest resistance change occurs between 65 °C either side of qNAT, being at least 15%/K. SPECIAL VERSIONS PTC’s are also available in many special housings (can be manufactured to customers specifications) For PTC temperature sensors in electrical windings: - the thermistors can only be inserted in the windings before impregnation - it is advisable to embed one in each phase, if possible in the centre of the coil generating most heat, and generally on the outflow side of any air movement - air inflow onto the temperature sensor will interfere with heat transfer - if using varnish/lacquer which is not chemically neutral, suitability tests must be undertaken by the customer - WARNING! It is very important that the sensor must be installed parallel with the copper of the winding, so that the teflon leads can assume the form of the rest of the winding and thereby retain the highvoltage resistance rating. Twin/double and triple PTC’s are available with standard or mini-bead. QUALITY STANDARD Random testing is carried out according to DGQ P90/P10 (DIN 40080). AQL values can be fixed by arrangement. ORDERING INFORMATION Quantity Type Temperature code No. Resistance max. 1.000 YD1 C 510 250 ohms PTC-Thermistors 02-02-02 1000-Y-180 INSTALLATION TIPS Single PTC YD = standard size bead 4 mm with shrunk-sleeve YG = standard size bead 4 mm with shrunk-sleeve and epoxy seal YGM = mini-bead 3 mm with shrunk-sleeve and epoxy seal Type YD1 Type YG1 Type YGM1 YD1 C508 YG1 C508 YGM1 C508 80 65 white - white YD1 C509 YG1 C509 YGM1 C509 90 65 green - green YD1 C510 YG1 C510 YGM1 C510 100 65 red - red YD1 C511 YG1 C511 YGM1 C511 110 65 brown - brown YD1 C512 YG1 C512 YGM1 C512 120 65 grey - grey YD1 C513 YG1 C513 YGM1 C513 130 65 blue - blue YD1 C514 YG1 C514 YGM1 C514 140 65 white - blue YD1 C545 YG1 C545 YGM1 C545 145 65 white - black YD1 C515 YG1 C515 YGM1 C515 150 65 black - black YD1 C655 YG1 C655 YGM1 C655 155 65 blue - black YD1 C516 YG1 C516 YGM1 C516 160 65 blue - red YD1 C517 YG1 C517 YGM1 C517 170 65 white - green YD1 C518 YG1 C518 YGM1 C518 180 65 red - white TEMPERATURE-RESISTANCE CURVE Resp. Std. Colour code temp.qNA Triple PTC YD = standard size bead 4 mm with shrunk-sleeve YG = standard size bead 4 mm with shrunk-sleeve and epoxy seal YGM = mini-bead 3 mm with shrunk-sleeve and epoxy seal Type YD3 Type YG3 Resp. temp.qNA Std. Colour code YD YG YD3 C508 YG3 C508 80 65 YD3 C509 YG3 C509 90 65 green - black - black - green YD3 C510 YG3 C510 100 65 red - black - black - red YD3 C511 YG3 C511 110 65 brown - black - black - brown YD3 C512 YG3 C512 120 65 grey - black - black - grey YD3 C513 YG3 C513 130 65 blue - black - black - blue YD3 C514 YG3 C514 140 65 white - black - black - blue YD3 C545 YG3 C545 145 65 white - black - black - black YD3 C515 YG3 C515 150 65 black - black - black - black YD3 C655 YG3 C655 155 65 blue - black - black - black YD3 C516 YG3 C516 160 65 blue - black - black - red YD3 C517 YG3 C517 170 65 white - black - black - green YD3 C518 YG3 C518 180 65 red - black - black - white white - black - black - white Mini PTC Threaded housing PTC-Thermistors 02-02-02 1000-Y-180 YGM = mini-bead 3 mm with shrunk-sleeve and epoxy seal Type YGM3 Resp. temp.qNA YGM3 C508 80 65 YGM3 C509 90 65 YGM3 C510 Std. Colour code YGM3 YGM mini-bead 3 mm with shrunk-sleeve and epoxy seal Type EF1 Resp. temp.qNA Std. Colour code white - yellow - yellow - white EF1 C508 80 65 green - yellow - yellow - green EF1 C509 90 65 green - green 100 65 red - yellow - yellow - red EF1 C510 100 65 red - red YGM3 C511 110 65 brown - yellow - yellow - brown EF1 C511 110 65 brown - brown YGM3 C512 120 65 grey - yellow - yellow - grey EF1 C512 120 65 grey - grey YGM3 C513 130 65 blue - yellow - yellow - blue EF1 C513 130 65 blue - blue YGM3 C514 140 65 white - yellow - yellow - blue EF1 C514 140 65 white - blue YGM3 C545 145 65 white - yellow - yellow - black EF1 C545 145 65 white - black YGM3 C515 150 65 black - yellow - yellow - black EF1 C515 150 65 black - black YGM3 C655 155 65 blue - yellow - yellow - black EF1 C655 155 65 blue - black YGM3 C516 160 65 blue - yellow - yellow - red EF1 C516 160 65 blue - red YGM3 C517 170 65 white - yellow - yellow - green EF1 C517 170 65 white - green YGM3 C518 180 65 red - yellow - yellow - white EF1 C518 180 65 red - white white - white When ordering please specify thread size, otherwise the stock M4 size will be supplied. PTC SWITCHING DEVICE TYPE TKA1, TKA2 PTC RELAY UNIT TYPE TKA1, TKA2 FEATURES ● sensor and relay unit are both interchangeable ● fixed sensor response temperature from 80 - 180 °C ● safe monitoring of sensing circuit and sensor ● upto 6 PTC’s can be connected ● quick installation housing (DIN-EN 50022) or screw fixing (M4) ● also available with push-button test light (can be retrofitted) DESCRIPTION These PTC relay units have been developed as state of the art devices. All other commercially available units can be replaced with ours. Relay unit and sensors as per DIN 44081 and 44082 give optimum protection against thermal overload. Together they provide a rapid and reliable motor-protection system. Two basic formats are available: TKA1 for applications where space is at a premium TKA2 in a DIN housing, eg. for use in control panels Any PTC thermistors that conform to DIN 44081 or 44082 can be connected to these relay units. ELECTRICAL DATA POWER SUPPLY: Voltage: 42 V, 110 V, 230 V, 400 V, 415 V0 ac Special voltages: eg dc, please ask Tolerance: + 10 % ... – 15 % Power consumption: less than 3VA Frequency: 40 – 60 Hz Operating temp.: – 20 °C to 60 °C RELAY OUTPUT 1 change-over contact Switching capacity at 250V Use category AC 11 3A Continuous current rating 6A Max. current rating of overload fuse 6 A VOLTAGE TESTING Test voltage between supply, relay contacts and PTC circuit, 2.5 kV Test voltage on output contacts, 1.0 kV PTC CONNECTION Max. quantity of PTC connectable: 6 pcs Terminal voltage for PTC’s Range: larger 1.6 k Smaller 3.6 k +/- 10 % SPECIAL VERSIONS PTC sensors can be delivered with a warning label/ tag. This has a 4 cm cord, so that the tag can be seen from the exterior when attached to the motor, equipment or plant, and will warn against applying voltages higher than 2.5V (surely this should be 2.5 kV). The ordering code for this label ist K105. INSTALLATION Screw or snap-on fixing TKA2 Installed on a 35 mm rail to DIN 46277 B.3 by means of an integral snap-on housing. Screw fixing TKA1 CANTHERM 8415 Mountain Sights Avenue • Montreal (Quebec), H4P 2B8, Canada Tel: (514) 739-3274 • 1-800-561-7207 • Fax: (514) 739-290 E-mail : [email protected] • Website: www.cantherm.com PTC-Thermistors 02-02-02 1000-Y-180 We reserve the right to alter specifications without notice.