Rockwell Automation Publication 750-PM001N-EN-P - February 2017 345
Troubleshooting Chapter 6
Dual Incremental Encoder
Faults and Alarms
Tab le 22 contains a list of encoder-specific faults and alarms, the type of fault or
alarm, the action that is taken when the drive faults, the parameter that is used to
configure the fault or alarm (if applicable), and a description and action (where
applicable).
Table 22 - Dual Incremental Encoder Fault and Alarm Types, Descriptions, and Actions
Event
No.
(1)
Fault/Alarm Text Type Fault
Action
Configuration
Parameter
Auto
Reset
Description/Action(s)
xx000 Enc0 Open Wire Configurable P3
[Enc 0 FB Lss Cfg]
The dual encoder module has detected an encoder 0 input signal (A, B,
or Z) in the same state as its complement (A Not, B Not, or Z Not). For
open wire detection to work, the encoder signals must be differential
(not single ended). The Z channel is only checked when enabled. See P1
[Enc 0 Cfg].
xx001 Enc0 Phase Loss Configurable P3
[Enc 0 FB Lss Cfg]
More than 30 encoder 0 phase loss (open wire) events have occurred
over an 8 millisecond time period. The same restrictions as for Enc0
Open Wire detection apply.
xx002 Enc0 Quad Loss Configurable P3
[Enc 0 FB Lss Cfg]
Encoder 0 Quadrature loss events occur when simultaneous edge
transitions occur on both the A and B channels of encoder 0. This fault
occurs when more than 10 quad loss events over a 10 millisecond time
period are detected. Only valid when both A and B channels are used
(not Bit 1 “A Chan Only”) in P1 [Enc 0 Cfg].
xx030 Enc1 Open Wire Configurable P13
[Enc 1 FB Lss Cfg]
The dual encoder module has detected an encoder 1 input signal (A, B,
or Z) in the same state as its complement (A Not, B Not, or Z Not). For
open wire detection to work, the encoder signals must be differential
(not single ended). The Z channel is only checked when enabled. See
P11 [Enc 1 Cfg].
xx031 Enc1 Phase Loss Configurable P13
[Enc 1 FB Lss Cfg]
More than 30 encoder 1 phase loss (open wire) events have occurred
over an 8 millisecond time period. The same restrictions as for Enc1
Open Wire detection apply.
xx032 Enc1 Quad Loss Configurable P13
[Enc 1 FB Lss Cfg]
Encoder 1 Quadrature loss events occur when simultaneous edge
transitions occur on both the A and B channels of encoder 1. This fault
occurs when more than 10 quad loss events over a 10 millisecond time
period are detected. Only valid when both A and B channels are used
(not Bit 1 “A Chan Only”) in P11 [Enc 1 Cfg].
xx058 Module Defaulted Fault Coast Module was commanded to write default values.
(1) xx indicates the port number. See Fault and Alarm Display Codes on page 308 for an explanation.
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