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Troubleshooting manual
AT.654254.050 ver.1.0
Failures of measuring voltage DC in operation, DC overvoltage, DC un-
dervoltage
VSD is ready
VSD is on and the current voltage is displayed on
screen
The controller displays voltage values Ud.
Not
Check that the voltage adjusting value Ud is
entered in the controller
In the UMKA07 controller menu, go to the
«Сreating» life cycle, select the
«DC bus calibration» submenu, the value of the parameter «DC-link (Ud)
adjusting factor
» must be set to 910 .
The voltage measured by the controller is close
to real but there is a difference of a few percent
In the UMKA07 controller menu, go to the
«Creating» life cycle, select the
«DC bus calibration» submenu, measure the values between terminals
Ud+ and Ud- and enter the received values in the
«DC-link voltage (Ud)»
column, and then check how the calibration coefficient changes.
Ud min protection value set correctly
In the UMKA07 controller menu, go to the
«Commissioning» life cycle,
select the
«Alarm setting» submenu, select «DC-link voltage», set the
«DC voltage MIN setpoint» to 400 V (for 380/415 V supply net) or 500 V
(for 480 V supply net).
Not
Yes
Not
Ud max protection value set correctly
In the UMKA07 controller menu, go to the
«Commissioning» life cycle,
select the
«Alarm setting» submenu, select «DC-link voltage», set the
«DC voltage MAX setpoint» to 780 V (for 380/415 V supply net) or 500 V
(for 480 V supply net).
Not
Stops due to Ud max, min alarms are repeating
A possible reason is that there are voltage drops or surges in the mains.
It is necessary to eliminate them.
Yes
Not
