LEESON SCR Thyristor Motor Control - Manual (Page 45)

39 Calibration SPEEDMASTER™ OPERATION MANUAL
TORQUE LIMIT (TORQUE)
The TORQUE setting determines the maximum torque for
accelerating and driving the motor. TORQUE is factory set at
120% of maximum drive current. You must recalibrate the
TORQUE setting if using a lower current rated motor. See
Figure 19 (page 41) and Figure 20 (page 42) for typical
TORQUE and IR COMP settings.
1. With no power applied to the drive, connect a DC ammeter
in series with the motor armature.
2. Set the TORQUE trimpot to full CCW.
3. Carefully lock the motor armature. Ensure that the motor
is firmly mounted.
4. Apply line power. The motor should be stopped.
5. Set the speed potentiometer or reference signal to
maximum speed. The motor should remain stopped.
6. Slowly rotate the TORQUE trimpot clockwise (CW) until
the ammeter reads 120% of maximum motor armature
current.
7. Set the speed adjust potentiometer or reference signal to
zero speed.
Warning
Although TORQUE is set to 120% of drive nameplate
current rating, continuous operation beyond that rating may
damage the motor. If you intend to operate beyond the
rating, contact your Leeson representative for assistance.
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