Emerson Unidrive M702 - Identifying a Trip; Trip Source

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248 Unidrive M702 User Guide
Issue Number: 3
Example
1. Trip code 2 is read from Pr 10.020 via serial communications.
2. Checking Table 13-4 shows Trip 2 is an Over Volts trip.
3. Look up Over Volts in Table 13-4.
4. Perform checks detailed under Diagnosis.
13.3 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 13-2 is in
the form xxyzz and used to identify the source of the trip.
Table 13-2 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 13-4 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 Table 13-3 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 13-3 Sub-trip identification
Over Volts OHt dc bus
OI ac Phase Loss
OI Brake Power Comms
PSU OI Snubber
OHt Inverter OHt Rectifier
OHt Power Temp Feedback
OHt Control Power Data
Keypad
display
Comms
code
No. Trip
2
Over Volts
xxyzz
00 - Generated by the control module
01 - Generated by the power module
0 - Always zero for a single drive
00
01
.
.
07
- Reason for the trip
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