LEESON NEMA 1 PWM Control: M1740008.00 - Manual (Page 10)

8
Regulation (IR COMP)
The IR COMP (P503) trimpot sets the voltage gain needed to
maintain the set speed of a motor under load. If the motor does not
maintain set speed as the load changes, gradually rotate the IR
COMP trimpot CW. If the motor oscillates (overcompensation), the
IR COMP trimpot may be set too high. Turn the IR COMP trimpot
CCW to stabilize the motor. See Figure 4 (page 9) for typical IR
COMP settings.
Current Limit (CURR. LIMIT)
The CURR. LIMIT trimpot (P505) sets the drive’s maximum
armature current limit. See Figure 4 for typical CURR. LIMIT
settings, or calibrate as follows:
1. With the AC line voltage disconnected from the drive, connect a
DC ammeter in series with the armature.
2. Set the CURR. LIMIT trimpot to minimum (full CCW).
3. Lock the motor armature. Be sure that the motor is firmly
mounted.
4. Connect AC line voltage to the drive.
5. Turn the power on, and set the speed adjust potentiometer to
maximum speed (full CW).
6. Adjust the CURR. LIMIT trimpot CW slowly until the armature
current is 120% of motor rated current.
7. Disconnect AC power from the drive.
8. Set the speed adjust potentiometer to minimum speed and
remove the lock from the motor shaft.