Terminal Box - Metal Ip65; Motor Insulation; Motor Protection; High-Potential Testing - Emerson Copeland Scroll ZR24KRE Application Manuallines

4.3.2 Terminal box – Metal IP65
Compressor models ZR108KRE to ZR190KRE with BOM 411 contain a metal terminal box IP65.
The first two nuts already installed on the Peko bolts shall not be removed, as they will ensure a
good tightness of the terminal box assembly. Make sure to assemble the ground connection of the
Peko bolt with a torque of 4 - 4.4 Nm and the ground connection between the cover and the body of
the terminal box with a torque of 1.8 - 2 Nm.
Figure 21: Terminal box IP65 and correct electrical installation, model range ZR108-190KRE BOM411
Make sure to assemble the cable gland M25 with a torque of 9.8 - 10 Nm. The cable gland is designed
for cable diameters of 10 to 17 mm – see Figure 21. The degree of protection (IP) will be safeguarded
only if sealing and cable glands are properly assembled. Only run the compressor with permanently
wired cables. The system manufacturer/installer shall provide the required strain relief.
Finally, close the cover of the terminal box applying a torque of 1.8 - 2 Nm. The degree of protection
(IP) will be safeguarded only if the cover is properly assembled.

Motor insulation

4.4
The motor insulation material is class "B" (TF*) for all ZR*KRE models within maximum allowable
operating temperatures according to IEC 34-1 or DIN 57530.

Motor protection

4.5
Independently from the internal motor protection, fuses must be installed before the compressor. The
selection of fuses has to be made according to EN 60269-1 or EN 60204-1 and compressor
maximum operating current (MOC). Not installing fuses before the compressor or selecting
inappropriate fuses may result in compressor failure.
Conventional inherent internal line break motor protection is provided for the complete range of
ZR*KRE compressors.

High-potential testing

4.6
WARNING
Conductor cables! Electrical shock! Shut off power supply before 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 assembly. Each motor
phase winding is tested according to EN 60034-1 at a differential voltage of 1000 V plus twice the
nominal voltage.
Since high-voltage tests lead to premature ageing of the winding insulation, further additional tests
of that nature are not recommended. However, if it has to be done for any reason, it shall not be
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