83003702.K Operating Instruction
Type KPC 108-L-U/S
page 38
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Single-Stage Hermetic Compliant SCROLL Motor-Compressor
Type ZR xx K3E-TWD-561
Module
For protection in case of blocked rotor one thermistor for each phase is embedded in the winding heads on the upper
(suction gas) side of the compressor motor (NAT 100 °C). A fourth thermistor is located in a winding head at the lower end
of the motor (NAT 140 °C). A fifth sensor is located in the discharge port of the fixed scroll to control discharge gas
superheat (NAT 140 °C). The entire chain is internally led to the fusite from where it is connected to the module connections S1
and S2. When any resistance of the thermistor chain reaches the tripping value, the module interrupts the control line
and causes the compressor to switch off. After the thermistor has cooled sufficiently, its resistance drops to the
reset value but the module itself resets after a time delay of 30 minutes and restarts the compressor.
Protector Functional Check and Failure Detection
Prior to start-up of the compressor a functional check shall be carried out:
- Switch off power!
- Disconnect one terminal either S1 or S2 of the electronic module. If the compressor is now switched on, the motor should not start.
- Switch off power.
- Reconnect the disconnected thermistor line. If the compressor is now switched on the motor must start.
