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316 Unidrive M Regen Design Guide
Issue Number: 4
12.3 Identifying a trip / trip source
Some trips only contain a trip string whereas some other trips have a trip
string along with a sub-trip number which provides the user with
additional information about the trip.
A trip can be generated from a control system or from a power system.
The sub-trip number associated with the trips listed in Table 12-1 is in
the form xxyzz and used to identify the source of the trip.
Table 12-1 Trips associated with xxyzz sub-trip number
The digits xx are 00 for a trip generated by the control system. For a
single drive (not part of a multi-power module drive), if the trip is related
to the power system then xx will have a value of 01, when displayed the
leading zeros are suppressed.
The y digit is used to identify the location of a trip which is generated by
a rectifier module connected to a power module (if xx is non zero). For a
control system trip (xx is zero), the y digit, where relevant is defined for
each trip. If not relevant, the y digit will have a value of zero.
The zz digits give the reason for the trip and are defined in each trip
description.
Figure 12-3 Key to sub-trip number
For example, if the drive has tripped and the lower line of the display
shows 'OHt Control.2’, with the help of Table 12-2 below the trip can be
interpreted as; an over temperature has been detected; the trip was
generated by fault in the control module, the control board thermistor 2
over temperature.
Table 12-2 Sub-trip identification
Over Volts OHt dc bus
OI ac Phase Loss
OI Brake Power Comms
PSU OI Snubber
OHt Inverter Temp Feedback
OHt Power Power Data
OHt Control
Source xx y zz Description
Control
system
00 0 01 Control board thermistor 1 over temperature
Control
system
00 0 02 Control board thermistor 2 over temperature
Control
system
00 0 03 Control board thermistor 3 over temperature
xxyzz
00 - Generated by the control module
01 - Generated by the power module
0 Upwards - Identifies the location
of the trip
00
01
.
.
07
- Reason for the trip
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