Installation And Maintenance Work - ABB ACSM1 Hardware Manual

6

Installation and maintenance work

These warnings are intended for all who work on the regen supply module.
WARNING! Ignoring the following instructions can cause physical injury or death, or
damage to the equipment.
Only qualified electricians are allowed to install and maintain the regen
supply module.
•
•
•
•
•
Notes:
•
WARNING! Ignoring the following instructions can cause physical injury or death, or
damage to the equipment.
•
Safety instructions
Never work on the regen supply module when input power is applied. After
disconnecting the input power, always wait for 5 minutes to let the intermediate
circuit capacitors and WFU-xx regen filter module capacitors discharge before
you start working on the regen supply module.
Always ensure by measuring with a multimeter (impedance at least 1 Mohm)
that:
1. There is no voltage between terminals L1, L2 and L3 and the ground.
2. There is no voltage between terminals U2, V2 and W2 and the ground.
3. There is no voltage between terminals UDC+ and UDC– and the ground.
4. There is no voltage between terminals R+ and R– and the ground.
Do not work on the control cables when power is applied to the regen supply
module or to the external control circuits. Externally supplied control circuits
may carry dangerous voltages even when the input power is switched off.
Do not make any insulation or voltage withstand tests on the regen supply
module.
If a regen supply module or WFU-xx regen filter module whose varistors are not
disconnected is installed on an IT power system (an ungrounded power system
or a high resistance grounded [over 30 ohms] power system), the regen supply
module will be connected to earth potential through the varistors. This may
cause danger or damage the regen supply module.
If a regen supply module or WFU-xx regen filter module whose built-in varistors
are not disconnected is installed on an corner-grounded TN system, the regen
supply module will be damaged.
Depending on the external wiring, dangerous voltages (115 V, 220 V or 230 V)
may be present on the terminals of the relay output(s) of the regen supply
module.
The regen supply module is not field repairable. Never attempt to repair a
malfunctioning regen supply module; contact your local ABB representative or
Authorized Service Center for replacement.