Trane TR200 Bypass Options, Common Run/Stop with Bypass, Automatic Bypass, Overload Protection

Introduction

Contactor	Drive Mode	OFF	Bypass	Test Mode
			Mode
M1	Closed	Open	Open	Closed
M2	Closed	Open	Open	Open
M3	Open	Open	Closed	Closed

Table 1.1 Contactor Operation

Figure 1.1 Basic Non Bypass Circuit

1.3 Bypass Options

1.3.1 Common Run/Stop with Bypass

Allows a remote signal to initiate operation in either drive control or bypass depending upon the position of the bypass selector switch.

1.3.2 Automatic Bypass

This feature automatically transfers the motor 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 bypass operation.

1.3.3 Run Permissive in Bypass

With run permissive active, the drive sends a run request and waits for a remote response before commanding the motor to start. The response indicates the system is safe to operate.

1.3.4 Basic Fire Mode in Bypass

This option switches the panel to bypass whenever a remote fire mode signal 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 for emergency situations. The motor will continue to run in bypass until fire mode is removed or the drive, panel, or motor fails. External safety signals and motor overload are ignored when in fire mode.

1.3.5 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 6.1.13 ECB Advanced Fire Mode.

1.3.6 Overload Protection

This thermally activated device provides mechanical overload protection for the motor 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. The overload provides Class 20 motor protection.

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