UTS Timer When the start mode is set to open-loop voltage ramp acceleration, the UTS Timer acts as an acceleration
kick. When the UTS timer expires, full voltage is applied to the motor. This feature can be used to reduce
motor surging that may occur near the end of an open loop voltage ramp start. If a surge occurs near the end
of the ramp, set the UTS timer to expire at this time and restart the motor. If the surge still occurs, set the UTS
time to a lower time until the surging subsides. If motor surging continues to be a problem, it is recommended
that one of the other standard MX
2
closed-loop starting profiles be used.
146
7 - THEORY OF OPERATION
Voltage
Time
Kick Time
Ramp
Time
Initial Voltage
Optional Kick
Current
Full Voltage
Start
command
UTS Time
Figure 33: Effect of UTS Timer on Voltage Ramp
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