Copyright 2014 by American Control Electronics
®
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reproduced or retransmitted in any form without written permission from American Control Electronics
®
.
The information and technical data in this document are subject to change without notice. American
Control Electronics
®
makes no warranty of any kind with respect to this material, including, but not
limited to, the implied warranties of its merchantability and fitness for a given purpose. American
Control Electronics
®
assumes no responsibility for any errors that may appear in this document
and makes no commitment to update or to keep current the information in this document.
QSG-0088 rev 0
Calibration
The trim pots in column A are for motor A. The trim pots in column B are for motor B.
Minimum Speed (MIN SPD):
In independent mode,
the MIN SPD setting determines the minimum
motor speed when the speed adjust potentiometer is set for minimum speed. It is factory set for zero
speed. To calibrate the MIN SPD:
1. Set the MIN SPD trim pot full CCW.
2. Set the speed adjust potentiometer for minimum speed.
3. Adjust the MIN SPD trim pot until the desired minimum speed is reached or is just at the
3.
threshold of rotation.
In ratio mode, MIN SPD for motor B sets the minimum ratio.
Maximum Speed (MAX SPD):
In independent mode,
the MAX SPD setting determines the maximum
motor speed when the speed adjust potentiometer is set for maximum speed. To calibrate the
MAX SPD:
1. Set the MAX SPD trim pot full CCW.
2. Set the speed adjust potentiometer for maximum speed.
3. Adjust the MAX SPD trim pot until the desired maximum speed is reached.
In ratio mode, MAX SPD for motor B set the maximum ratio.
Check the MIN SPD and MAX SPD adjustments after recalibrating to verify that the motor runs at the
desired minimum and maximum speed.
Torque (TORQUE):
The TORQUE setting determines the maximum torque for accelerating and driving
the motor. To calibrate the TORQUE:
1. With the power disconnected from the drive, connect a DC ammeter in series with the
1.
armature.
2. Set the TORQUE trim pot to minimum (full CCW).
3. Set the speed adjust potentiometer to maximum speed (full CW).
4. Carefully lock the motor armature. Be sure that the motor is firmly mounted.
5. Apply line power. The motor should be stopped.
6. Slowly adjust the TORQUE trim pot CW until the armature current is 150% of motor rated
6.
armature current.
Continuous operation beyond this rating may damage the motor.
7. Turn the speed adjust potentiometer CCW.
8. Remove line power.
9. Remove the stall from the motor.
10. Remove the ammeter in series with the motor armature if it is no longer needed.
IR Compensation (IR COMP):
The IR COMP setting determines the degree to which motor speed is
held constant as the motor load changes. To calibrate the IR COMP:
1. Set the IR COMP trim pot full CCW.
2. Increase the speed adjust potentiometer until the motor runs at midspeed without load. A
2.
handheld tachometer may be used to measure motor speed.
3. Load the motor armature to its full load armature current rating. The motor should slow down.
4. While keeping the load on the motor, rotate the IR COMP trim pot until the motor runs at the
4.
speed measured in step 2. If the motor oscillates (overcompensation), the IR COMP trim pot
4.
may be set too high (CW). Turn the IR COMP trim pot CCW to stabilize the motor.
5. Unload the motor.
Acceleration / Deceleration (ACC/DEC):
The ACC/dec setting determines the time the motor takes to
ramp to a lower or higher speed. ACC/dec is factory set for the shortest acceleration time (full CCW).
To calibrate the ACC/DEC:
1. Set the speed adjust potentiometer for minimum speed.
2. Set the speed adjust potentiometer for maximum speed. Measure the time is takes the motor
2.
to go from minimum speed to maximum speed.
3. If the time measured in step 2 is not the desired acceleration time, turn the ACCE/DEC trim pot
3.
CW for a longer acceleration time, or CCW for a shorter acceleration time. Repeat steps 1
3.
through 3 until the acceleration time is correct.
MOTOR
A1
A2
FWD
BRAKE
REV
DYNAMIC
BRAKE
RESISTOR
INHIBIT
Reversing with a Dynamic Brake
A dynamic brake may be used when reversing the motor direction. Use a three pole, three position
switch rated for at least the armature voltage rating and 150% of the armature current rating. For the
dynamic brake resistor, use a 40 watt minimum, high power, wirewound resistor. Sizing the dynamic
brake resistor depends on load inertia, motor voltage, and braking time. Use a lower-value,
higher-wattage dynamic brake resistor to stop a motor more rapidly. Recommended values are 15
ohms for a 90 VDC motor and 30 ohms for 180 VDC motor.
The motor must come to a complete stop before changing directions.
REVERSING
INHIBIT
MOTOR
A2
A1
RUN
BRAKE
DYNAMIC BRAKE
RESISTOR
S3
S2
S1
RUN
DECEL TO
MIN SPEED
10K OHM
SPEED ADJUST
POTENTIOMETER
CW
Decelerate to Minimum Speed
The switch shown below may be used to decelerate a motor to a minimum speed. Closing the switch
between S1 and S2 decelerates the motor from set speed to a minimum speed determined by the MIN
SPD trim pot setting. If the MIN SPD trim pot is set full CCW, the motor decelerates to zero speed when
the switch between S1 and S2 is closed. The DECEL trim pot setting determines the rate at which the
drive decelerates. By opening the switch, the motor accelerates to set speed at a rate determined by
the ACCEL trim pot setting.
Decelerate to Zero Speed (Coast)
See INHIBIT in the CONNECTIONS section on page 1 for a description of wiring and connection
locations.
Decelerate to Zero Speed (Dynamic Brake)
Dynamic braking may be used to rapidly stop a motor. For the RUN/BRAKE switch, use a two pole, two
position switch rated for at least the armature voltage rating and 150% of the armature current rating.
For the dynamic brake resistor, use a 40 watt minimum, high power, wirewound resistor. Sizing the
dynamic brake resistor depends on load inertia, motor voltage, and braking time. Use a lower-value,
higher-wattage dynamic brake resistor to stop a motor more rapidly. Recommended values are 15 ohms
for a 90 VDC motor and 30 ohms for 180 VDC motor.
DECELERATING & STOPPING
Operation
Speed / Torque
Mode (J502)
Independent or Ratio Mode (J501)
Independent Mode:
In independent mode, potentiometer A control sets the speed for motor A and
potentiometer B sets the speed for motor B. For independent mode, jumper pins 1 and 2 on J501.
Ratio Mode:
In ratio mode, potentiometer B sets the ratio between the motors. For example, if
potentiometer B is set for a 2:1 ratio, motor B will always run at half the speed of motor A. Use
potentiometer A to vary the speed of both motors.
Speed or Torque Mode (J502)
Speed Mode:
In speed mode, the drive will do whatever current (torque) is necessary to achieve
the commanded voltage (speed) on the motor. This is the most common setup.
Torque Mode:
In torque mode, the drive will do whatever voltage (speed) is necessary to achieve
the commanded current (torque) on the motor. This is used in tensioning applications.
Voltage Settings (J504 and J505)
Set jumpers J504 and J505 for 90 if using a 90 VDC motor with a 115 VAC line input.
Set jumpers J504 and J505 for 180 if using a 180 VDC motor with a 230 VAC line input.
- Verify that no foreign conductive material is present on the printed circuit board.
- Ensure that all switches are properly set.
Independent Mode
1. Turn both speed adjust potentiometers full counterclockwise (CCW).
2. Apply AC line voltage.
3. Slowly advance the speed adjust potentiometer A clockwise (CW). Motor A slowly accelerates as
the potentiometer is turned CW. Continue until the desired speed is reached.
4. Repeat step 3 with potentiometer B for motor B.
5. Remove AC line voltage from the drive to coast the motors to a stop.
Ratio Mode
1. Turn both speed adjust potentiometers full counterclockwise (CCW).
2. Apply AC line voltage.
3. Slowly advance the speed adjust potentiometer A clockwise (CW). Motor A slowly accelerates as
the potentiometer is turned CW. Continue until the desired motor A speed is reached.
4. Slowly advance the speed adjust potentiometer B clockwise (CW). Motor B slowly accelerates as
the potentiometer is turned CW. Continue until the desired motor B speed is reached.
5. Now use potentiometer A to vary the speed of both motors. The motors should stay at the same
ratio.
6. Remove AC line voltage from the drive to coast the motors to a stop.
STARTUP
SELECT SWITCHES
Startup
S1
1
S
2
S
S2
S3
M
IN-SPEED
-MAX
IR COM
P
S3
L2
L1
A-/A
A+/A
1
ACC/DEC
CUR LIM
A -- INHIBIT -- B
J504
J505
J507
J506
A-B
IC503
IC502
J503
J502
C5
07
C5
08
180 90
C510
C506
C505
C503
D501
D502
U1
R503
R501
C15
Q504
Q503
Q502
R38
MOV502
C501
J501
Y501
C504
A- / B
A+ / B
M
TORQUE
SPEED
INDE
P.
RA
TIO
180 90
Indep. / Ratio
Mode (J501)
90 / 180
(J504 & J505)
