Siemens SIMOTRAS 6SG7050 Operating Instructions Manual page 571

01.04
13 Maintenance
WARNING
Hazardous voltages are present in this electrical equipment during operation.
A hazardous voltage may be present at the signalling relays in the customer installation.
Non-observance of the safety instructions can result in death, severe personal injury or
substantial property damage.
When carrying out maintenance work on this converter, please read all safety instructions
included in this section and attached to the product itself.
•
Maintenance work on the converter may be carried out only by qualified personnel who are
thoroughly familiar with all safety notices in this manual and with the installation, operating
and maintenance instructions.
•
Before carrying out visual checks and maintenance work, ensure that the AC power supply
is disconnected and locked out and that the converter is grounded. Before the AC supply is
disconnected, both converters and motors are at hazardous voltage levels. Even when the
converter contactor is open, hazardous voltages are still present.
•
The snubber capacitors continue to carry hazardous voltage for up to 2 minutes after
isolation from the supply. For this reason, the converter must not be opened for at least two
minutes after switch-off.
Only spare parts authorized by the manufacturer may be used.
The SIMOTRAS HD converter must be thoroughly protected against the ingress of dirt so as to
prevent voltage flashovers and thus irreparable damage. Dust and foreign bodies, and especially
contamination drawn in through the cooling air flow, must be carefully removed at regular intervals
depending on the degree of pollution, but at least once every 12 months. The converter must be
cleaned with dry, compressed air, max. 1 bar, or with a vacuum cleaner.
Please note the following with respect to SIMOTRAS HD converters with forced air cooling:
The fan bearings are designed for a service lifetime of 30000 hours. The fans should be replaced in
plenty of time in order to maintain the availability of the thyristor sets.
SIEMENS AG 6SG7000-0BA76
SIMOTRAS HD Operating Instructions
Maintenance
13-1