148 ACS 400 User’s Manual
Fault and Alarm Status
The ACS 400 provides fault and alarm status words for the external control system. These data
words are accessible only through the serial communication link but not from the control panel.
Fault and alarm status words are located in parameter group 3. The group also contains copies of
the Control Word and Status Word. Group 3 parameters are of read-only type; however, both alarm
words can be reset by writing a zero to them.
Table 26 Fault and alarm status words.
Table 27 Bit descriptions for fault words 1 and 2. See also the Diagnostics section for more
information about faults and fault codes.
Code Name Description
301
MAIN COMMAND WORD Read-only copy of the Control Word. See
page 141.
302
MAIN STATUS WORD Read-only copy of the Status Word. See page 143.
305
FAULT WORD 1 Fault information. When a fault is active, the
corresponding bit is set. Bit descriptions are given
in Table 27.
306
FAULT WORD 2 Fault information. When a fault is active, the
corresponding bit is set. Bit descriptions are given
in Table 27.
308
ALARM WORD 1 Alarm information. When an alarm is active, the
corresponding bit is set. Bits remain set until the
whole alarm word is reset by writing 0 to it. See
Table 28.
309
ALARM WORD 2 Alarm information. When an alarm is active, the
corresponding bit is set. Bits remain set until the
whole alarm word is reset by writing 0 to it. See
Table 28.
Bit # Fault Word 1 Fault Word 2
0 Overcurrent Underload
1 DC overvoltage Reserved
2 ACS 400 overtemperature DDCS link
3 Fault current Reserved
4 Output overload
5 DC undervoltage
6 Analog input 1 fault
7 Analog input 2 fault
8 Motor overtemperature Hardware error
9 Panel loss
10 Parameters inconsistent
11 DC bus ripple too large
12 Motor stall
13 Serial communication loss
14 External fault
15 Output ground fault
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