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▪ Simulation of an open thermistor chain (∞ Ω): Remove the jumper us ed f or t he s hort -circuit
simulation and switch on the voltage supply; the relay remains s witched of f ; no connect ion
between terminals M1 and M2.
If one of the above conditions is not met, the module is defective and has to be exchanged.
NOTE: The function of the module should be tested each time the fuse in the control circui t
breaks the power supply. This ensures the contacts did not stick.
4.6
High-potential testing
WARNING
Conductor cables! Electrical shock hazard! Shut off power supply bef ore
high-potential testing.
CAUTION
Internal arcing! Motor destruction! Do not carry out high-voltage or
insulation tests if the compressor housing is under vacuum.
Emerson subjects all scroll compressors to a high-voltage test after final as sembly . E ach motor
phase winding is tested, according to EN 0530 or VDE 0530 part 1, at a d if f erent ial voltage of
1000 V plus twice the nominal voltage. Since high-voltage tests lead to premat ure ageing of t he
winding insulation additional tests of that nature are not recommended.
If it has to be done for any reason, a lower voltage must be used. Disconnect all electronic devices,
eg, motor protection module, fan speed control, etc prior to testing.
AGL_HP_ST_ZHK1P_EN_Rev00
23
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