bonitron M3534B, Customer Reference Manual

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M3534R 20A
32
5.3. T
ROUBLESHOOTING
Table 5-1: Detailed Troubleshooting Guide
S
YMPTOM
A
CTION
No Panel LEDs Check incoming power
Replace 3534R2
RTA never ON Check DISABLE command
Initiate test cycle or remove power

Watch and listen for signs of activity

Check RTA contact and LED

Ticking sound
Check power quality data to confirm sag events should have caused activity to
occur
If no activity ever replace 3534R2
RTA always ON Check DC Bus levels on both sides of output diodes
Check for low line level

Too much activity can cause stage fuse failures, and overheating
Check threshold level, if changed over time adjust level or replace 3534R2
Lower threshold by at least 10V
Overtemp Check for constant current on the negative or positive DC bus links
Check for missing phase in drive power feed
Check for low line level
Check temp sensors on IGBT heatsink
Check activity record
– too much activity may cause overtemp
Check precharge network for overheating
– (cause of low bus and constant
activity)
TEST won’t work
Check DC bus level
– too high causes no test activity
Check blown fuse LED during test
– If ON check stage fuses
Check test input to 3534R2
If OK, replace 3534R2
Voltage fluctuates
during TEST mode Check threshold and test boost level settings. Over-voltage shutdown can
occur if settings are too high on 460V systems, causing an oscillation affect.

Lower threshold level and retry
Stays in TEST
mode Threshold way too high

Only appears to be in test mode

Can occur in 400V systems if RT is factory set for 585V
Check test input to 3534R2
If OK replace 3534R2