
Parameter listing and descriptions 301
ACH550-01 User's Manual
8109 START FREQ 1 0.0…500 Hz
Sets the frequency limit used to start the first auxiliary motor. The first
auxiliary motor starts if:
• no auxiliary
motors are
running.
• ACH550 output
frequency
exceeds the limit:
8109 + 1 Hz.
• output frequency
stays above a
relaxed limit
(8109 - 1 Hz) for
at least the time:
8115
AUX MOT
START D.
After the first
auxiliary motor
starts:
• Output frequency decreases by the value
(8109
START FREQ 1) - (8112 LOW FREQ 1).
• In effect, the output of the speed regulated motor drops to
compensate for the input from the auxiliary motor.
See figure, where:
• A = (8109
START FREQ 1) - (8112 LOW FREQ 1)
• B = Output frequency increase during the start delay.
• C = Diagram showing auxiliary motor’s run status as frequency
increases (1 = On).
Note: 8109
START FREQ 1 value must be between:
•8112 LOW FREQ 1
• (2008
MAXIMUM FREQ) -1.
8110 START FREQ 2 0.0…500 Hz
Sets the frequency limit used to start the second auxiliary motor.
•See 8109
START FREQ 1 for a complete description of the operation.
The second auxiliary motor starts if:
• one auxiliary motor is running.
• ACH550 output frequency exceeds the limit 8110 + 1.
• output frequency stays above the relaxed limit (8110 - 1 Hz) for at
least the time 8115
AUX MOT START D.
Code Description Range
P 8115
(P 8109)+1
P 8112
A
B
f (Hz)
f
MAX
f
MIN
1
0
C
P 8109
A
t
t
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