Allen-Bradley SMC-50, User Manual

Page: 151 / 292

Rockwell Automation Publication 1560F-UM001A-EN-P - June 2019 151
Diagnostics Chapter 8
Table provides an overview of the Fault and Alarm codes with Time Delay and
Restart options plus a basic description of what causes each Fault or Alarm to
occur.
NVS Error 34 5 D — — — Clear Fault
(3)
75 — — — — —
V24 Recovery 35 5 D X — — Fault
(3)
76 — — — — —
V24 Loss 36 5 D X — — Param Change
(3)
77 — — — — —
VControl Loss 37 5 D X — — Reserved 78-99 — — — — —
TB Input
(1)
1 38 6 D X — X System Faults 100-199 5 D X — —
2 39 X — X
3 40 — — X
4 41 — — X
Current Imbal 42 7 M X — —
(1) TB = Terminal Block Input
(2) For Category, M= Motor; D=Device
(3) Codes 71...77 are Event codes.
TIP Most Faults and Alarms are individually bit enabled and disabled (F/A Bit
Enab) and can have a user configurable delay time to help avoid nuisance
trips (Time Delay Aval). In addition, many have the ability to automatically
restart once the condition is cleared (Restart En).
Table 57 - Linear Listing—Fault and Alarm Code Overview
Fault/Alarm
Code Name
F/A
Co
de
Time
De
la
y A
vai
l.
F/A
Bit En
able
Restar
t Enable
Description
F/A= Fault and Alarm, A= Alarm, F= Fault
Line Loss A 1 N Y Y
F/A
Loss of line power for Phase A, B, or C
B 2
C 3
Shorted SCR A 4 N N N
A
A
During prestart checks
(motor stopped not
running), the SMC-50
control module monitors
for current flow in each
individual phase.
NOTE:
In Wye configurations, a single
Phase A, B, or C shorted SCR is not
detected until the unit is started. This
fault is always enabled.
B 5
C 6
Open Gate A 7 N Y Y F/A Indicates that an abnormal condition that causes faulty firing (for
example, open SCR Gate) has been sensed during the starting
sequence.
B 8
C 9
SCR Overtemp 10 N N N
A
F The SMC-50 control module protects the SCRs from damage caused
by overtemperature operation using an internally configured I
2
t. NOTE:
This fault is always enabled.
Table 56 - Fault/Alarm Code Cross-Reference (Continued)
Fault/Alarm
Name
Cod
e
LED
Code
Ca
te
go
ry
(2)
Ho
st
DP
I/H
IM/C
OMM
Exp
7,
8,
9
Fault/Alarm Name
Cod
e
LED
Code
Ca
te
go
ry
(2)
Ho
st
DP
I/H
IM/C
OMM
Exp
7,
8,
9