The power unit doors can only be opened under the following conditions:
● The firing pulses are disabled.
● Voltages at the input and output sides are below a minimum value.
● The circuit breakers are open.
● The mushroom pushbutton on the control unit is actuated.
You can open the power unit door when the green "Door lock release" lamp is lit.
WARNING
Danger due to high voltages although the door interlocking has been released
Even when the door interlocking is released, dangerous high voltages can still be present at
the auxiliary circuits (fans, anti-condensation heating, closed-loop control, etc.). High voltages
can cause death or serious injury if safety rules are not observed or if equipment is handled
improperly.
● Make sure that work is only carried out by qualified personnel under due observance of the
five safety rules, the warning information in these operating instructions, and the safety-
related information on the product itself.
If the auxiliary voltage fails, you can only unlock the doors manually. To unlock the doors,
proceed as described in the chapter titled "Preparation for use".
See also
Opening doors in preparation for use (Page 50)
9.4 Preventive maintenance
The purpose of an inspection is to ascertain and evaluate the current status of the equipment.
An inspection mainly comprises visual checks. Inspections should be carried out based on a
schedule that meets the needs of the special ambient conditions at the location of use. The
following servicing and inspection instructions are used as the basis for regular inspection of
the equipment.
Maintenance work Carried out by Frequency Comments
Check the cooling system Operating
company
After 30 000 op‐
erating hours
Check the fans
Clean the outside of the cabinet Operating
company
As required Visual inspection, clean if re‐
quired
Clean the inside of the cabinet Siemens serv‐
ice personnel
Annually Visual inspection, clean if re‐
quired
Check power and control con‐
nections
Operating
company
After one year,
and every four
years thereafter
Maintenance
9.4 Preventive maintenance
SINAMICS SL150 6SL38600UL432AA0Z
Operating Instructions Rev.201910281433 EXAMPLE 79
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