Two inputs can be programmed for the brake switch. During stop, the switches should be
closed and open during run. If the brake switch is open during Mode = Idle, then the
brake switch failure fault will also occur. If during the run, the brake switch closes, the
brake switch failure fault will not occur.
UPS Operation
During UPS Operation there is the option for the drive to determine the direction of travel
based on the load to utilize the least amount of power under a UPS supply. This option is
, the drive will measure the
motor torque and then command the motor to travel in the direction of least resistance at
the programmed LS10 Battery Operation Speed. The conditions for determining direction
of travel are:
• Less than Balanced = Up
• Greater than Balanced = Down
If the drive is programmed for binary, digital, absolute analog, or CAN speed control
modes, LI50 UPS Mode becomes active while UPS Operation is being utilized. When
LI50 is set to default (0), both up and down directions must be signaled to determine the
easy direction. When LI50 is set to easy direction (1), either up or down direction can be
commanded, and the drive will determine the easy direction (signaling both directions is
not required).
This function can be extended to open loop easy direction for open loop induction
applications. The user will be required to set LC01 Control Mode to open loop vector (1)
and to set LI50 UPS Mode to easy direction (1). While in UPS mode when the run is
commanded, the drive will briefly turn the motor in both directions while monitoring the
torque current. Whichever direction that the torque current value is negative, the drive will
run the motor in that direction. When UPS Operation is active, the speed of the motor is
locked at the programmed LS10 Battery Operation Speed.
Easy direction is not available if the drive is programmed for serial service 49, serial
service 50, serial binary or bi-polar analog speed control. During UPS operation, the
direction of travel will be as commanded.
During regular operation (not UPS mode), if both direction inputs are signaled
Main Contactor Check (MCC) Input / Output
The MCC Input and Output can be incorporated independently or function in combination.
MCC Output
The MCC output is used to control the motor contactor. The MCC output is ON when the
drive processes the direction input command. As the contactor closes, the Normally
Open (NO) contact on the contactor should be used to signal the STO Inputs.
The MCC output will turn OFF at the end of the run after the direction input has been
dropped AND the output current has ramped down to zero; the drive will be in Mode = No
Direction (LS) at this point. As the contactor opens, the normally open (NO) contact on
the contactor should be used to remove the signal from the STO and SBC inputs.
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