2.6.1.2 Mid-Range Instability Control Set Up Using Switch S1
Definition
Mid-range instability and the resulting loss of torque occurs in
any step motor/drive system due to the motor back EMF
modulating the motor winding currents at certain speeds. Enable
the mid-range instability function if your application is affected
by loss of torque at mid-range speeds (indicated by the motor
stalling at 50% maximum speed). When enabled, the circuitry
advances or delays the switching of the output transistors with
respect to the incoming pulse to damp the instability.
Benefit
This feature controls torque at mid-range speeds. When enabled,
the motor maintains torque at mid-range operation, provided the
torque load does not exceed motor torque ratings.
Procedure
With the power OFF, enable or disable mid-range instability by
setting switch position 4 as follows:
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
To set control to ...
Move switch SW1 settings to .....
Enable
(Default factory setting)
Disable
5645 Installation and Hardware Manual
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