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MAINTENANCE & INSPECTION
The maintenance and inspection should be carried out only after the main fuse box in the
3-phase AC line is turned OFF or disconnected properly.
Maintain and inspect the set regularly as per following guidelines:
a) Regular Inspection (Every 3-6 months, depending on operation frequency):
Inspection
Fuse Box
Input and Output
Terminals
Line Contactor Confirmation of abrasion at Contact
Inside the power
source
b) Cautions to H.V. Test & Insulation Resistance Measurement Test
Careless execution of these tests will cause damage to the power source since thyristors
and other semiconductor parts are in this unit. While conducting these tests according to
the by-laws of your company, the following steps should be performed first:
o Take off the cables from the switch box that are connected to the three input
terminals and short-circuit the three input terminals.
o Take off the cable that is connected to two output terminals and short-circuit the
two output terminals.
o Short circuit between anode and cathodes of thyristors SCR1-6.
o Remove the two ground conductors. (Take off the left side panel. Remove one
conductor near the contactor on the upper panel and also the other conductor near
to the leg of the reactor at lower front of the power source).
o Use 500 V DC Megger only.
o Go back to original conditions by removing short-circuit etc. once the test is over.
Inspection Point
Loose connection / damage
Confirmation of proper use
Proper tightening of connections
Confirmation of insulation
points
Sedimentation of Dust
Trace of overheating and damage
to cables / wiring
Maintenance Method
Repair if necessary, refer to
Power Equipment Capacity
Tighten first and then insulate
Replace with new one
Blow out the dust using dry
Repair the damaged section
and insulate properly. Replace
with new wire / cable if
damage is severe.
7
with tape
compressed air.
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