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Measuring the insulation resistance of the DC cabling
WARNING!
Obey the safety instructions of the drive. If you ignore them, injury or
death, or damage to the equipment can occur. If you are not a qualified
electrical professional, do not do installation, commissioning or
maintenance work.
WARNING!
Open the DC switch/disconnector [Q11] of the unit. Make also sure that the
charging switch [Q10] is open.
WARNING!
Do not do voltage withstand or insulation resistance tests on the drive. The
tests can cause damage to the drive. Every drive is tested for insulation between
the main circuit and the chassis at the factory. Also, there are voltage-limiting
circuits inside the drive which cut down the testing voltage automatically.
Measure the insulation resistance of the DC cabling as follows:
1.
Make sure that the cable is disconnected both at the drive end and at the other
end: all conductors (including the grounding conductor) and the cable shield.
2.
At the drive end, connect all conductors and shield of the cable together and to
the grounding busbar (PE).
3.
Disconnect one conductor and measure the insulation resistance between the
conductor and the grounding busbar (PE) by using a measuring voltage of 1 kV
DC. The insulation resistance must be higher than 1 Mohm.
4.
Disconnect another conductor and measure its insulation resistance. Repeat this
for all remaining conductors (including the cable shield).
Electrical installation 29
Ohm
11
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