ABB ACH550-01 User Manual page 313

Code Description
8111 START FREQ 3
Sets the frequency limit used to start the third auxiliary motor.
• See 8109
The third auxiliary motor starts if:
• two auxiliary motors are running.
• ACH550 output frequency exceeds the limit 8111 + 1 Hz.
• output frequency stays above the relaxed limit (8111 - 1 Hz) for at
least the time 8115
8112 LOW FREQ 1
Sets the frequency limit used to stop the first auxiliary motor. The first
auxiliary motor stops if:
• the first auxiliary
motor is running
alone.
• ACH550 output
frequency drops
below the limit:
8112 - 1.
• output frequency
stays below the
relaxed limit
(8112 + 1 Hz) for
at least the time:
8116
AUX MOT
.
STOP D
After the first
auxiliary motor
stops:
• Output frequency
increases by the value
(8109
START FREQ
• In effect, the output of the speed regulated motor increases to
compensate for the loss of the auxiliary motor.
See figure, where:
• A = (8109
• B = Output frequency decrease during the stop delay.
• C = Diagram showing auxiliary motor's run status as frequency
decreases (1 = On).
• Grey path = Shows hysteresis – if time is reversed, the path
backwards is not the same. For details on the path for starting, see
the diagram at 8109
Note: 8112
LOW FREQ
• (2007
MINIMUM FREQ
308
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1 for a complete description of the operation.
START FREQ
AUX MOT START D
f (Hz)
f
MAX
P 8109
P 8112
(P 8112)-1
f
MIN
C
1) - (8112
LOW FREQ
1) - (8112
START FREQ
START FREQ
1 value must be between:
) +1 and 8109
ACH550-01 User's Manual
Range
0.0...500 Hz
.
0.0...500 Hz
A
P 8116
1
0
1).
1)
LOW FREQ
1.
1
START FREQ
Parameter listing and descriptions
A
t
B
t