Max' Trimpot; Min' Trimpot; Accel' Trimpot; Decel' Trimpot - DART Controls EZ VFD CONTROL Series Instruction Manual

'MAX' Trimpot

The MAX trimpot range is 48 - 120Hz. The MAX trimpot comes factory set to 60Hz.
To decrease the MAX speed setting, turn the trimpot CCW to the desired speed.
To increase the MAX speed setting, turn the trimpot CW to the desired speed.
Refer to the MAX trimpot diagram for range settings.
NOTE: Speed settings above 60Hz will require the control RMS output current to
be derated by up to 20% at 120Hz. Refer to de-rate graph below.
Caution: Operating a motor above its rated speed may result in some motors running hotter than
normal. When operating a motor beyond its normal speed range the motor manufacturer should
be consulted to determine if de-rating or additional cooling methods may be required.

'MIN' Trimpot

The MIN trimpot range is 5-30Hz. The min pot is factory set at full CCW which is
0Hz. To increase the min set point, set the master speedpot to 0 on the dial and
then adjust the MIN trimpot CW to the desired minimum speed when the master
speedpot is set to zero.

'ACCEL' Trimpot

The adjustable range of ACCEL is a linear .5 to 30 second ramp from 0 - 60Hz.
The ACCEL pot is factory set to approx 2 sec from 0-60Hz. A CCW adjustment
will reduce the ramp time and a CW adjustment will increase the ramp time.
Caution should be given to ACCEL ramp times below 2 sec as this may result
in an over current shutdown.
Note: Higher MAX setting will result in longer ramp times. A MAX setting of
120Hz will extend ACCEL range from 1 - 60 sec.

'DECEL' Trimpot

The adjustable range of DECEL is a linear .5 to 30 second ramp from 60 - 0Hz.
The DECEL pot is factory set to approx 2 sec from 60-0Hz. A CCW adjustment
will reduce the ramp time and a CW adjustment will increase the ramp time.
Caution should be given to DECEL ramp times below 2 sec as this may result
in an over current shutdowns.
Note: Higher MAX setting will result in longer ramp times. A MAX setting of
120Hz will extend the DECEL range from 60-1 sec.
Derate Curve above 60Hz
100
80
Output
IRMS (%)
60
Frequency (Hz)
Output
8
62
48
120
0
MIN Hz
0.5
Rate
Time
in sec.
0.5
Rate
Time
in sec.
85
120
MAX Hz
15
30
15
30
0 - 60 Hz
15
30
60 - 0 Hz