Emerson 386 Optional Features, Motor Load Transfer, Load Disconnect Feature, Delay After Transfer

SECTION 5 OPTIONAL FEATURES

MOTOR LOAD TRANSFER

Inphase monitoring logic controls transfer and retransfer of motor loads, so that inrush currents do not exceed normal starting currents. It avoids nuisance tripping of circuit breakers and mechanical damage to motor couplings.

The Motor Load Transfer feature is built into the controller. DIP switch S1 (actuator 5) activates this feature: right = ON, left = OFF.

FUNCTION	S1 DIP SWITCH
enable	Actuator 5 on		5
disable	Actuator 5 off
		5

Shaded DIP switches are standard factory settings.

Note

If the Motor Load Transfer feature is enabled, it will be activated following the Load Disconnect Feature Delay Before Transfer delay. Also, the transfer switch may not operate immediately after the transfer control switch is operated, even if both sources are available. This delay is intentional introduced if the two power sources are not inphase. Depending on the frequency difference, it may take a few seconds for the sources to reach synchronism.

LOAD DISCONNECT FEATURE

Connect external circuits to the terminals indicated on the Wiring Diagram in the back of this manual.

The double throw (Form C) contact is rated for 28 VDC or 120 VAC (6 amps resistive). The contact operates prior to a selectable 0, 3, 10, or 20 second delay before transfer of the Non-Automatic Transfer Switch. The contact resets either immediately following transfer or after the same delay as set for pre–signal before transfer.

Time delay between the load disconnect control signal and initiation of transfer is set on the controller with DIP switch S2 (actuators 6, 7, 8) as shown below:

Delay Before Transfer

LD TDBT	S2 DIP SWITCH
	Actuator 7 on
0 (disable)			7
	Actuator 8 on		8
3 seconds	Actuator 7 on			7
	Actuator 8 off	8
10 seconds	Actuator 7 off	7
	Actuator 8 on			8
20 seconds	Actuator 7 off	7
	Actuator 8 off	8

Shaded DIP switches are standard factory settings.

Delay After Transfer*

LD TDAT	S2 DIP SWITCH
enable	Actuator 6 on		6
disable	Actuator 6 off
		6

*Enabling the Delay After Transfer will cause the control signal to reset after the same delay as set for the Delay Before Transfer.

5---1