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20
Speed controlling
The analogue input gives the speed (frequency) reference for ACS55. The correspondence between the analogue input and the
reference depends on the settings of the DIP switches as shown below. Output frequency follows the reference changes as defined by
the ACC/DEC potentiometer.
High frequency mode OFF (default)
f
f
N
a
b
0
10 V
2 V
4 mA
20 mA
DIP switch settings:
HI FREQ = OFF
AI OFFSET = OFF (curve a) or ON** (curve b)
MOTOR NOM FREQ = 50 or 60 Hz
The output frequency is limited to the selected
nominal frequency of the motor.
* Use AI jumper to select voltage or current signal. See page 18.
** To protect the drive against analogue input signal loss, the drive trips if the signal value is below 2 V (4 mA).
Input*
[V, mA]
DIP switch settings:
HI FREQ = ON
AI OFFSET = OFF (curve a) or ON** (curve b)
MOTOR NOM FREQ = 50 or 60 Hz
Actual output frequency is limited to a value between f
HI FREQ potentiometer. The potentiometer does not affect the scaling of the
analogue input.
High frequency mode ON
f
frequency reference
f
+ 70 Hz
N
f
N
a
b
0
2 V
4 mA
output frequency limit
Input*
10 V
[V, mA]
20 mA
and f
+ 70 Hz by the
N
N
EN
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