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62 Electrical installation
Checking the insulation of the energy storage cable
WARNING!
Obey the safety instructions given in Safety instructions for ACS880
liquid-cooled multidrive cabinets and modules (3AXD50000048633
[English]). If you ignore the safety instructions, injury or death, or damage
to the equipment can occur.
If you are not a qualified electrician, do not do installation or maintenance
work.
WARNING!
Open the DC switch/disconnector [Q11] of each DC/DC converter.
WARNING!
Do not make any voltage withstand or insulation resistance tests on any part of
the drive as testing can damage the drive. Every drive has been 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.
Check the insulation resistance of the energy storage as instructed by its manufacturer.
Check the energy storage cable as follows:
1. Make sure that the cable is disconnected from the DC/DC converter and energy storage:
all conductors and the shield.
2. At the converter unit end, connect all conductors and shield of the cable together and
to the grounding terminal (PE).
3. Disconnect one conductor and measure the insulation resistance between the conductor
and the PE by using a measuring voltage of 1 kV DC. The insulation resistance must
be higher than 1 Mohm.
4. Reconnect the conductor, disconnect another conductor and measure its insulation
resistance. Repeat this for all remaining conductors (including the cable shield).
ohm
+
Energy storage
-
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