132 Maintenance
In order to ensure reliable drive operation, replace the power modules according to the
maintenance interval table.
Reforming capacitors of the power modules
Power modules that are used as spare parts must be installed and operated in a drive
every 2 years in order to reform the capacitors and thus reduce the risk of a potential
hazard.
Testing main power supply circuit
The main power supply circuit must be tested regularly according to the preventive
maintenance interval table. The tests consist of the actuation and checking of proper
reaction of
• Emergency stop
• MCB door button (Main power supply OFF and ON)
• Panel stop
• customer specific devices
Replacing the control panel battery
The battery is housed on the rear of the control panel. Replace with a new battery. Dispose
the old battery according to local disposal rules or applicable laws.
For details refer to the ACS-AP-X assistant control panels user’s manual.
Circuit board replacements
Control unit (BCU) and memory unit (ZMU)
To locate the BCU see figure Control compartment with open swing frame on page 33.
NOTICE
Electrostatic discharge (ESD) can damage electronic boards and components.
Do not touch printed circuit boards or other sensitive components without applying
static-sensitive handling precautions!
Do not touch the components without wearing ESD protection device.
Put the board or component on a grounded working surface protected against
electrostatic discharges.
Hold a board only at the edge.
Handle a faulty board as carefully as a new one.
NOTICE
Any electrical board replacement must be done after power is off. Only qualified
electricians are allowed to carry out electrical parts replacement.
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