Trimpot Adjustment Chart & Procedure - DART Controls 125D Manuel D'instructions

TRIMPOT ADJUSTMENT CHART & PROCEDURE
Settings apply when using a 5K ohm master speedpot. This chart is used
in conjunction with the adjustment procedure and is approximate.
C.L.
125D-12C
120 VAC input;
0-90 VDC output
125DV-C
120 VAC input;
0-90 VDC output
Operation of the control beyond ±10% of the normal line voltage could result
in re-adjustment. These adjustments are permanent; periodic re-adjustment
is normally not needed.
*
NOTE: ADDITIONAL CUSTOMER HEATSINK REQUIRED FOR 125DV-C (120 VAC INPUT - GREATER THAN 1/2 H.P. MOTORS) AND (240 VAC INPUT - GREATER THAN 1 H.P.
NOTE: FOR DETERMINING TRIMPOT SETTINGS FOR THE 123D-C SERIES, SEE TRIMPOT SETTINGS PROCEDURE BELOW.
TRIMPOT FUNCTION
MIN. Sets minimum motor speed when speedpot
is set at zero. CW rotation will increase min-
imum motor speed.
IR COMP Provides a means of improving motor speed
regulation in the armature feedback mode. If
a slowdown due to load change is of no con-
cern, rotate this trimpot fully CCW.
MAX.
Sets maximum motor speed when speedpot
is set at maximum (fully CW rotation). CW
rotation of MAX trimpot increases maximum
motor speed.
CUR.LIM. Limits DC motor armature current (torque) to
prevent damage to the motor or control. The
current limit is set for the rated motor current.
CW rotation of this trimpot increases the
armature current (or torque produced).
I.R. MAX MIN HP
1/50
1/20
1/8
1/8
1/4
1/3
1/2
3/4*
1.0*
MOTORS). 125 EXTRUSION TEMPERATURES SHOULD NOT EXCEED 70 DEGREES C.
5
Settings apply when using a 5K ohm master speedpot. This chart is used
in conjunction with the adjustment procedure and is approximate.
HP C.L. I.R. MAX
1/20
1/8
1/4
1/4
1/3
1/2
3/4
1.0
1.5*
2.0*
ADJUSTMENT
1. Set Speedpot to zero (fully CCW).
2. Rotate MIN trimpot CW until motor starts to rotate.
3. Slowly rotate MIN trimpot CCW until motor stops.
NOTE: If motor rotation is desired, rotate MIN trimpot CW
until desired MIN speed is reached.
1. Set Speedpot at 50%.
2. Observe motor speed at no load condition.
3. Apply full load to motor.
4. Turn IR COMP trimpot CW to obtain the same motor
speed as with no load.
1. TURN DRIVE POWER OFF!!
2. Connect a DC Voltmeter: + to +ARM, - to -ARM.
NOTE: Meter must not be grounded!!
3. Set meter voltage range: (90 VDC for 120 VAC, 180 VDC
for 240 VAC).
4. Turn power on. Set Speedpot at 100%.
5. Adjust MAX trimpot to rated motor armature voltage as
shown on meter. NOTE: A tachometer or strobe may be
used in lieu of a meter. Follow above steps, except adjust
MAX trimpot to rated motor base speed indicated by
tachometer or strobe.
1. TURN DRIVE POWER OFF!
2. Connect a DC Ammeter between A1 on motor and +ARM
on control. This is in series with the motor.
3. Turn power on.
4. Set Speedpot at the 50% position.
5. Apply friction braking to motor shaft until motor stalls.
6. With motor stalled, set current at 125% of rated motor
armature current by adjusting CUR. LIM . trimpot.
MIN
125D-12C
240 VAC input;
0-180 VDC output
125DV-C
240 VAC input;
0-180 VDC output