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"UniVert 2" inverter
Page 30 of 42 8000012364 BAL, en
7 Troubleshooting
Attention! All work on the unit may be carried out by specially
trained qualified personnel only. Always observe the safety
instructions! (See chapter 1.)
7.1 No Output Voltage or Output Current Present
(with connected load)
Individual INV operation:
• DC present and correct polarity?
• Are the LCD and the fan working? (Control unit is supplied with
power)
• Is the INV switched on?
• Is the miniature circuit-breaker F1 switched on?
• Has a monitoring system responded?
(Switch the INV OFF and back ON)
With INVs in parallel operation: (additionally)
• LCD shows output voltage but no current:
AC fuse faulty? Check output voltage of the unit
INV does not synchronise and does not switch on the output
contactor
For systems with SBS: (additionally)
• LCD shows output voltage but no current:
INV does not synchronise and does not switch on the output
contactor
Is the SBS blocked?
If all aforementioned points are OK, proceed as follows:
• Disconnect the unit and disassemble it (see chapter 5.4)
• Unscrew the cover
• Observe the safety instructions!
• Check fuse F1 on printed circuit board A3.1 (softstart)
• Check fuse F100 on printed circuit board A17
(INV interface, auxiliary power supply)
• Check fuse F1 on printed circuit board A17
(INV interface, 24 V for fan, relay, INV control)
• Check plug connections for correct position
It the fault cannot be eliminated, return the unit to the works for repair
enclosing a fault description.
7.2 Output Voltage Deviation
• Did the INV cause the output voltage deviation?
• Is the unit running with current limiting due to overload?
Reduce the load!