Installation manual

I/O Control Parameters
S1A53838 09/2011 107
Parameters [VIA bias] (F470) and [VIB bias] (F472) are factory set so that a minimal signal needs to be
applied to VIA or VIB before the drive starts the motor.
z To increase the signal level required to start the motor, decrease the input bias level.
z To reduce the signal level required to start the motor, increase the input bias level.
Parameters [VIA gain] (F471) and [VIB gain] (F473) are factory set so that the drive output reaches rated
voltage and frequency just before the signal to VIA or VIB reaches its maximum level.
z To decrease the signal level required before the drive output reaches rated voltage and frequency, increase
the input gain level.
z To increase the signal level required before the drive output reaches rated voltage and frequency, decrease
the input gain level.
Note: If the input gain level is set too low, the drive output may never reach rated voltage and frequency.
F470 [VIA bias]
VIA analog input bias
0 to 255 128
DANGER
UNINTENDED EQUIPMENT OPERATION
If the input bias level is set too high, the drive will start the motor without a signal present at VIA or VIB.
Failure to follow these instructions will result in death or serious injury.
F471 [VIA gain]
VIA analog input gain
0 to 255 148
F472 [VIB bias]
VIB analog input bias
0 to 255 128
DANGER
UNINTENDED EQUIPMENT OPERATION
If the input bias level is set too high, the drive will start the motor without a signal present at VIA or VIB.
Failure to follow these instructions will result in death or serious injury.
F473 [VIB gain]
VIB analog input gain
0 to 255 148
Code Name / Description Adjustment range Factory setting
DANGER
UNINTENDED EQUIPMENT OPERATION
If the input bias level is set too high, the drive will start the motor without a signal present at VIA or VIB.
Failure to follow these instructions will result in death or serious injury.
0
100%
%
Hz
0%
,
,
10 Vdc
0 V
20 mAdc
0(4) mA
Output frequency
Maximum frequency
Speed Reference Signal (VIA, VIB Input Value)
Default Setting
Smaller
Large
Smaller
Large