250-0533 rev 1
Calibration
Minimum Speed (MIN SPD):
The MIN SPD se�ng determines the minimum motor speed when the
speed adjust poten�ometer 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 poten�ometer or input voltage signal for minimum speed.
3. Adjust the MIN SPD trim pot un�l the desired minimum speed is reached or is just at the
3.
threshold of rota�on.
Maximum Speed (MAX SPD):
The MAX SPD se�ng determines the maximum motor speed when the
speed adjust poten�ometer is set for maximum speed. To calibrate the MAX SPD:
1. Set the MAX SPD trim pot full CCW.
2. Set the speed adjust poten�ometer or input voltage signal for maximum speed.
3. Adjust the MAX SPD trim pot un�l the desired maximum speed is reached.
Check the MIN SPD and MAX SPD adjustments a�er recalibra�ng to verify that the motor runs at the
desired minimum and maximum speed.
Torque (CURRENT LIMIT):
The CURRENT LIMIT se�ng determines the maximum torque for
accelera�ng and driving the motor. To calibrate the CURRENT LIMIT:
1. With the power disconnected from the drive, connect a DC ammeter in series with the
1.
armature.
2. Set the CURRENT LIMIT trim pot to minimum (full CCW).
3. Set the speed adjust poten�ometer or input voltage signal to maximum speed.
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 CURRENT LIMIT trim pot CW un�l the armature current is 150% of motor
6.
rated armature current.
Con�nuous opera�on beyond this ra�ng may damage the motor.
7. Turn the speed adjust poten�ometer CCW or decrease the input voltage signal.
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 Compensa�on (IR COMP):
The IR COMP se�ng 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 poten�ometer or input voltage signal un�l the motor runs at
2.
midspeed without load. A handheld tachometer may be used to measure motor speed.
3. Load the motor armature to its full load armature current ra�ng. The motor should slow down.
4. While keeping the load on the motor, rotate the IR COMP trim pot un�l the motor runs at the
4.
speed measured in step 2. If the motor oscillates (overcompensa�on), 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.
Accelera�on (ACCEL):
The ACCEL se�ng determines the �me the motor takes to ramp to a higher
speed. ACCEL is factory set for the shortest accelera�on �me (full CCW). To calibrate the ACCEL:
1. Set the speed adjust poten�ometer or input voltage signal for minimum speed.
2. Set the speed adjust poten�ometer or input voltage signal for maximum speed.
2.
Measure the �me is takes the motor to go from minimum speed to maximum speed.
3. If the �me measured in step 2 is not the desired accelera�on �me, turn the ACCEL trim pot
3.
CW for a longer accelera�on �me, or CCW for a shorter accelera�on �me. Repeat steps 1
3.
through 3 un�l the accelera�on �me is correct.
Decelera�on (DECEL):
The DECEL se�ng determines the �me the motor takes to ramp to a lower
speed. DECEL is factory set for the shortest decelera�on �me (full CCW). To calibrate the DECEL:
1. Set the speed adjust poten�ometer or input voltage signal for maximum speed.
2. Set the speed adjust poten�ometer or input voltage signal for minimum speed.
2.
Measure the �me is takes the motor to go from maximum speed to minimum speed.
3. If the �me measured in step 2 is not the desired decelera�on �me, turn the DECEL trim pot
3.
CW for a longer decelera�on �me, or CCW for a shorter decelera�on �me. Repeat steps 1
3.
through 3 un�l the decelera�on �me 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 direc�on. Use a three pole, three posi�on
switch rated for at least the armature voltage ra�ng and 150% of the armature current ra�ng. For the
dynamic brake resistor, use a 40 wa� minimum, high power, wirewound resistor. Sizing the dynamic
brake resistor depends on load iner�a, motor voltage, and braking �me. Use a lower-value,
higher-wa�age dynamic brake resistor to stop a motor more rapidly. Recommended values are 15
ohms for a 130 VDC motor and 30 ohms for 240 VDC motor.
The motor must come to a complete stop
before changing direc�ons.
REVERSING
INHIBIT
MOTOR
A2
A1
RUN
BRAKE
DYNAMIC BRAKE
RESISTOR
Decelerate to Minimum Speed
The switch shown below may be used to decelerate a motor to a minimum speed. Opening the switch
decelerates the motor from set speed to a minimum speed determined by the MIN SPD trim pot se�ng.
If the MIN SPD trim pot is set full CCW, the motor decelerates to zero speed when the switch is opened.
The DECEL trim pot se�ng determines the rate at which the drive decelerates. By closing the switch,
the motor accelerates to set speed at a rate determined by the ACCEL trim pot se�ng.
Decelerate to Zero Speed (Coast)
See INHIBIT in the CONNECTIONS sec�on on page 1 for a descrip�on of wiring and connec�on
loca�ons.
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 posi�on switch rated for at least the armature voltage ra�ng and 150% of the armature current
ra�ng. For the dynamic brake resistor, use a 40 wa� minimum, high power, wirewound resistor. Sizing
the dynamic brake resistor depends on load iner�a, motor voltage, and braking �me. Use a lower-value,
higher-wa�age dynamic brake resistor to stop a motor more rapidly. Recommended values are 15
ohms for a 130 VDC motor and 30 ohms for 240 VDC motor.
DECELERATING & STOPPING
S3
S2
S1
RUN
DECEL TO
MIN SPEED
Input Voltage Reference (+)
Input Voltage Common (-)
Operation
Current Limit (CURRENT LIMIT):
Red LED lights whenever the drive reaches current limit.
Power (POWER):
Green LED lights whenever AC line voltage is applied to the drive.
LEDs
IL501
TH501
30
5
Q
IL502
10
5T
C503
10
5
C
C505
C502
C504
10
5
R
D
IBI
H
NI
T
LIMIT
S3
S2
S1
2L
1L
2A
1A
CURRENT
POWER
CURRENT LIMIT
DECEL
ACCEL
IR COMP
MAX SPD MIN SPD
Current Limit
LED
Power
LED
Startup
STARTUP
- Verify that no foreign conduc�ve material is present on the printed circuit board.
1. Set the analog input voltage signal to minimum.
2. Apply AC line voltage.
3. Slowly increase the analog input voltage signal. The motor slowly accelerates as the analog input
3.
voltage signal is increased. Con�nue un�l the desired speed is reached.
4. Remove AC line voltage from the drive to coast the motor to a stop.
No part of this document may be
reproduced
or retransmi�ed in any form without wri�en permission
from Midwest Mo�on Products. The informa�on and technical data in this document are subject
to change without no�ce. Midwest Mo�on Products
makes no warranty of any kind with
respect to this material, including, but not limited to, the
implied warran�es of its
merchantability and fitness for a given purpose. Midwest Mo�on Products
assumes no
responsibility for any errors that may appear in this document and makes no commitment to
update or to keep current the informa�on in this document.
