Checking The Insulation Of The Assembly - ABB ACS800 Hardware Manual

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Note: The optical components (transmitter and receiver) on a fibre optic link must be
of the same type.
Plastic optical fibre (POF) cables can be used with both 5 MBd and 10 MBd optical
components. 10 MBd components also enable the use of Hard Clad Silica (HCS
cables, which allow longer connection distances thanks to their lower attenuation.
HCS
The maximum lengths of fibre optic links for POF and HCS
metres respectively.
®
HCS

Checking the insulation of the assembly

Every ACS800-104 inverter module has been tested for insulation between the main
circuit and the chassis (2500 V rms 50 Hz for 1 second) at the factory. Therefore, do
not make any voltage tolerance or insulation resistance tests (e.g. hi-pot or megger)
on the inverter units or modules. Check the insulation of the assembly as follows.
WARNING! Check the insulation before connecting the drive to the main supply.
Make sure that the drive is disconnected from the mains (input power).
1. Check that the motor cable is disconnected from the drive output terminals U2,
V2 and W2.
2. Measure the insulation resistances of the motor cable and the motor between
M
each phase and the Protective Earth by using a measuring voltage of 1 kV DC.
ohm
The insulation resistance must be higher than 1 Mohm.
PE
Electrical installation
®
cables cannot be used with 5 MBd optical components.
is a trademark of SpecTran Corporation.
®
cables are 20 and 50
®
)