Operating Instructions

SED2 to BT300 Variable Frequency Drives Migration Guide
Document Number 125-1005
January 12, 2015
Wiring
Figure 8. Wiring Example for Auto Bypass with Interlock on VFD Fault.
Essential Services
Description
The Essential Services feature allows full-power bypass mode control of the motor
during an emergency scenario. Activation of Essential Services overrides any other
selected operation. Essential Services ensures that the bypass contactor will not open
when a safety input or overload opens. Power goes directly to the motor.
NOTE: If using both the Interlock (DIP Switch 3 is set ON) and Essential Services
features, Essential Services waits 10 seconds for the Interlock to confirm the
safety condition (such as opening a damper). After the 10-second delay,
Essential Services controls the motor regardless of the Interlock safety
condition status.
CAUTION:
Use extreme care when using the Essential Services mode. All safety
circuits are no longer active (including motor overload and safety inputs to
the Controller board).