BENSHAW ENHANCED KEYPAD Manual de usuario descargar pdf (Pagina 154)

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

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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BENSHAW ENHANCED KEYPAD Manual de usuario Pagina 154