
120
ACS 400 User’s Manual
8112
LOW FREQ 1
Sets a frequency limit (see Figure 50). When the ACS 400’s output frequency falls below the value (8112
LOW
FREQ
1 - 1 Hz) and one auxiliary motor is running, the Stop Delay counter is started. When the time set
with parameter 8116
AUX MOT STOP D
. is elapsed and if the output frequency is still below the value (8112
LOW
FREQ
1 + 1 Hz), the first auxiliary motor is stopped.
After the auxiliary motor is stopped, the ACS 400’s output frequency is increased by the value (8109
START
FREQ
1 - 8112
LOW
FREQ
1).
Note!
Low Frequency 1 should be within limits 2007
MINIMUM
FREQ
+1 and 8109
START
FREQ
1.
8113
LOW FREQ 2
Sets a frequency limit (see Figure 50). When the ACS 400’s output frequency falls below the value (8113
LOW
FREQ
2 - 1 Hz) and two auxiliary motors are running, the Stop Delay counter is started. When the time
set with parameter 8116
AUX MOT STOP D
. is elapsed and if the output frequency is still below value (8113
LOW FREQ 2 + 1 Hz), the second auxiliary motor is stopped.
After the auxiliary motor is stopped, the ACS 400’s output frequency is increased by a value (8110
START
FREQ
2 - 8113
LOW
FREQ
2).
Note!
Low Frequency 2 should be within limits 2007
MINIMUM
FREQ
+1 and 8109
START
FREQ
2
8114
LOW FREQ 3
Sets a frequency limit (see Figure 50). When the ACS 400’s output frequency falls below a value (8114
LOW
FREQ
3 - 1 Hz) and three auxiliary motors are running a Stop Delay counter is started. When the time set
with parameter 8116
AUX MOT STOP D
. is elapsed and if the output frequency is still below the value (8114
LOW
FREQ
3 + 1 Hz), the third auxiliary motor is stopped.
After the auxiliary motor is stopped, ACS 400 output frequency is increased by value (8111
START
FREQ
3 -
8114
LOW
FREQ
3).
Note!
Low Frequency 3 should be within limits 2007
MINIMUM
FREQ
+1 and 8109
START
FREQ
3.
8115
AUX MOT START D
Sets the Start Delay for the auxiliary motors. See parameter 8112
LOW
FREQ
1 and Figure 50 for more
information.
8116
AUX MOT STOP D.
Sets the Stop Delay for the auxiliary motors. See parameter 8112
LOW
FREQ
1 for more information.
Figure 50 Start Frequency, Low Frequency, Start Delay and Stop Delay.
Code Description
Frequency
f
min
Start
Stop
Aux Motor 1
Stop/Start
Time
8109
START
FREQ
1 + 1 Hz
8112
LOW
FREQ
1 - 1 Hz
f
max
Frequency in-
crease during
the Start Delay
Frequency de-
crease during
the Stop Delay
8116
AUX
MOT
STOP
D
.
8115
AUX
MOT
START
D
Increasing
flow
Decreasing
flow
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