Trane Vertical Bypass/Non Bypass Panel, TR200 5.1.6 EMB2 Safety Interlock, 5.1.7 EMB2 Fire Mode

Electromechanical Bypass (EMB2) Operation

trip when pressed. Use the reset pushbutton to reset the overload after the test.

•Reset is used to reset the overload after it trips. If the overload is still hot, wait until the motor reaches normal operating temperature before resetting. The overload offers a manual (hand) or auto reset selection. It is highly recommended to operate in the manual factory setting to prevent the risk of damage to the motor.

		TRIP		130BX229.10
	5		MANUAL
	10
TEST	20	30	AUTO
			RESET
97NO	98NO	95NC	96NC
T1		T2	T3

Figure 5.2 Sample Overload Device

5.1.6 EMB2 Safety Interlock

General Information

The safety interlock feature prevents the drive or bypass from operating. For operation in drive or bypass, the safety interlock input contact must be closed. Only a fire mode command to run in bypass overrides this function. Safety inputs include, but are not limited to, high and low pressure limit switches, fire alarm, smoke alarm, high and low temperature switches, and vibration sensors.

Operation

When an external safety input closes, the panel is in operational mode. When open, power is interrupted to the drive output and bypass contactors and relays, and the bypass ignores all run commands except for fire mode operation. When power is interrupted in drive mode, the drive display indicates an external fault, meaning the problem is external to the drive. In some instances, a fault can be caused by a failure within the panel, which will still be reported as an external fault from the drive. A factory installed jumper allows the unit to operate when no safety input is connected. This jumper must be removed when connecting a safety interlock in the circuit.

Safety Interlock Function Setup

•Remove factory-installed jumper between terminals 5 and 6 on connector X55

•Wire safety input to terminals 5 and 6 on connector X55

5.1.7 EMB2 Fire Mode

General Information

Fire mode runs the motor at full speed in bypass and is intended to ignore common safety, overload, and mode selector switch inputs in emergency situations. The motor will continue to run in bypass until fire mode is removed or the unit fails.

Prior to Enabling Fire Mode

•Complete the start-up procedure to verify motor rotation direction in bypass is correct and that the system is ready in all respects for continuous full speed operation in bypass.

Operation

•Activation of fire mode is accomplished by closing connector X55, input terminals 7 and 8.

•When activated, a relay overrides the safety circuit, motor overload, and bypass switch (SW1) position.

•Fire mode is deactivated only when removed or fuses blow.

•Fire mode status can be reported through connector X55, terminals 9 and 10, a normally open dry contact that closes when fire mode is active.

Fire Mode Function Setup

•Wire the fire mode input to connector X55, terminals 7 and 8.

•Wire the fire mode status output to connector X55, terminals 9 and 10.

5.1.8 EMB2 Fault Reporting

General Information

A fault indication is provided if the drive experiences a fault or bypass input power is lost. The EMB2 bypass control card monitors the drive fault output for status reporting. The fault contacts are fail-safe, meaning that if power is removed, a fault condition is automatically reported. Fault status is not monitored in bypass operation.

Operation

For the EMB2, fault reporting is monitored through a Form-C relay (RL2) on the bypass control board. The relay reports a fault on connector X59 terminals 5, 6, and 7. In normal operation, the relay is powered and terminal 5 is closed with terminal 7 open. In a fault condition, power to the relay is lost and the relay positions automatically reverse, signaling the fault condition. Terminal 6 is common to both.

BAS-SVX49A-EN 5-5