Operating instructions

Drive converter cabinet units
Operating Instructions, 10/2008, A5E00288214A
431
Maintenance and servicing
11
11.1 Chapter content
This chapter provides information on the following:
● Maintenance and servicing procedures that have to be carried out on a regular basis to
ensure the availability of the cabinet units.
● Exchanging device components when the unit is serviced
● Forming the DC link capacitors
● Upgrading the cabinet unit firmware
● Loading the new operator panel firmware from the PC.
DANGER
Five safety rules
When carrying out any kind of work on electrical devices, the "five safety rules" must
always be observed:
1. Disconnect the system
2. Protect against reconnection.
3. Make sure that the equipment has zero potential
4. Ground and short-circuit.
5. Cover or fence off adjacent components that are still live.
DANGER
Before carrying out any maintenance or repair work on the de-energized cabinet unit, wait
for 5 minutes after switching off the supply voltage. This allows the capacitors to discharge
to a harmless level (< 25 V) after the supply voltage has been switched off.
Before starting work, you should also measure the voltage after the 5 minutes have
elapsed. The voltage can be measured on DC link terminals DCP and DCN.
DANGER
When the external power supply for individual options (L50 / L55) or the external 230 V AC
auxiliary supply is connected, dangerous voltages are still present in the cabinet unit even
when the main circuit breaker is open.