Bypass Options - Trane TR200 Operating Instructions Manual

Introduction

Bypass Options

Common run/stop with bypass.Allows a common remote signal through the VFD input terminals to initiate
operation in either drive control or bypass. A relay closure starts the motor(s) in drive or bypass, depending
upon the position of the bypass selector switch.
Automatic bypassAutomatically transfers the motor(s) from drive to bypass without operator intervention when
a fault condition trips the drive, after a programmable time-out period. The VFD's internal fault circuitry controls
this action. The time delay permits all automatically resettable faults to clear prior to transfer to bypass. Run
permissive or safety circuit signals override the auto bypass function and may prevent or delay running in
bypass.
Run permissive in bypass.With run permissive active, the drive sends a run request and waits for a remote
response to before notifying the motor to start. The response indicates the system is safe to operate.
Basic fire mode in bypass.This option switches the panel to bypass whenever a remote fire mode command is
given to the VFD through the input terminals. In either drive or bypass, fire mode is intended to ignore common
safety and overload inputs in emergency situations. The motor will continue to run in bypass until fire mode is
removed or the drive or option panel fail. External safety signals and motor overload are ignored when in fire
mode.
Advanced fire mode in bypass.The advanced fire mode allows for a variety of programmable responses to an
external fire mode command signal. Bypass options are programmed through the drive's fire mode parameters.
See fire mode section of the drive manual and support materials for available options.
Overload protection.This thermally activated device provides mechanical overload protection for the motor(s)
while in bypass operation. It measures motor current and is set to the full load amps (FLA) of the motor. A 1.2
x FLA service factor is built-in and maintained, meaning that should the motor current increase above that value,
the overload will calculate the level of increase to activate timing for the trip function. The higher the current
draw, the quicker the trip response. It provides Class 20 motor protection.
Bypass Platform Configurations
The EMB is available in three platforms: EMB(0), EMB1, and EMB2. The features available as options with each
platform are listed in the following table. The ECB, also listed below, has all option features available. See
Chapter 5 for additional details on the EMB and Chapter 6 for the ECB.
6 TR200 Option Panel Operating Instructions