ACH550-UH User’s Manual 165
Serial Communication – EFB
Note! Operation of CONTROL WORD and STATUS WORD conform to the ABB Drives
Profile with one exception:
CONTROL WORD bit 10 (REMOTE_CMD) is not used by the
ACH550.
Example. Using the CONTROL WORD to start the drive:
• First, the requirements for using the CONTROL WORD must be met. See above.
• When the power is first connected, the state of the drive is not ready to switch on.
See dotted lined path (
) in the state diagram below.
• Use the CONTROL WORD to step through the state machine states until the
OPERATING state is reached, meaning that the drive is running and follows the
given reference. See table below.
7 ALARM 1 Warning/alarm (See "Alarm Listing" in the "Diagnostics"
section for details on alarms.)
0 No warning/alarm
8 AT_SETPOINT 1
OPERATING. Actual value equals (within tolerance limits)
the reference value.
0 Actual value is outside tolerance limits (not equal to
reference value).
9 REMOTE 1 Drive control location:
REMOTE (EXT1 or EXT2)
0 Drive control location: LOCAL
10 ABOVE_LIMIT 1 Supervised parameter’s value > supervision high limit.
Bit remains “1” until supervised parameter’s value <
supervision low limit.
See group 32, Supervision
0 Supervised parameter’s value < supervision low limit.
Bit remains “0” until supervised parameter’s value >
supervision high limit.
See group 32, Supervision
11 EXT CTRL LOC 1 External control location 2 (
EXT2) selected
0 External control location 1 (EXT1) selected
12 EXT RUN ENABLE 1 External Run Enable signal received
0 No External Run Enable signal received
13… 15 Unused
Step CONTROL WORD Value Description
1 CW = 0000 0000 0000 0110 This CW value changes the drive state to READY TO SWITCH
ON.
2 Wait at least 100 ms before proceeding.
3 CW = 0000 0000 0000 0111 This CW value changes the drive state to
READY TO OPERATE.
4 CW = 0000 0000 0000 1111 This CW value changes the drive state to
OPERATION ENABLED.
The drive starts, but will not accelerate.
ABB Drives Profile (EFB)
STATUS WORD
Bit Name Value
Description
(Correspond to states/boxes in the state diagram)
bit 0bit 15
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