Eaton Electrical RTC-50 instruction manual Go To Generator Input, Output Connections

Instructional Booklet

Instruction Manual for the Eaton RTC-50 Automatic Transfer Switch Controller

Effective: June 2007 Page 5

2.5 Go To Generator Input

The RTC-50 has a control input signal that will initiate a transfer from Utility to Generator. The input requires an external contact closure to the Go To Generator input (J6, pins 1 and 2).

The Control Input “State” definitions are as follows.

Connected - When the input is shorted by an external contact or connection.

Unconnected - When the input is NOT shorted by an external con- tact or connection.

The Go To Generator Input operations are defined as follows.

When this input (J6, pins 1 and 2) is in the “Connected” state, the RTC-50 will initiate a transfer from Utility to Generator. The Gen- erator must be manually started or the Utility sensing wires must be interrupted in order to initiate an engine start. After the Gener- ator becomes available, TDNE will time out before the transfer to Generator takes place. Re-transfer will occur when the external contact is opened or under a failsafe condition.

2.6 Output Connections

The RTC-50 output connections are divided into two categories:

•Customer Connections

•Transfer Operation Connections.

2.6.1Customer Connections Load Shed Contacts

There are two sets of load shed contacts for customer use on con- nector J7, Load Shed Contacts #1 and Load Shed Contacts #2. Both sets of contacts are closed when the transfer switch is in the Utility position and both sets are open when the transfer switch is in the Generator position. The output contacts are rated for 5 amps @ 250 VAC. The DC rating is 5 amps @ 30 VDC.

Generator Service Indicator Light

The Generator Service Indicator Light is wired to connector J8, pins 1 and 2. A 5mm panel-mount LED with a maximum current rating of 25 mA is recommended (Dialight 559-5101-007F or equivalent). The LED can be located up to 1000 feet away from the RTC-50.

The LED is polarity sensitive. The red lead must be wired to J8, pin 1 and the black lead must be wired to J8, pin 2. If the wiring is reversed, the LED will not light.

The RTC-50 will track the number of hours that the generator has run. It will then turn on the Generator Service Indicator light to indicate that routine maintenance is required for every 25 hours that the generator has run. This will constitute one maintenance cycle.

The RTC-50 will keep track of the number of hours that the gener- ator has run for up to 1000 hours. At this point, the counter will roll over and start again. The information is stored in non-volatile memory so that the value is retained when there is a loss of power.

The end-user will press the Gen Service Reset Switch to retrieve the generator run time information. The indicator will flash both long and short flashes to indicate the number of hours the genera- tor has run. Each long flash (1 second) of the indicator equals 100 hours of run time and each short flash (0.2 second) equals 25 hours of run time.

Generator Service Reset Switch

The Generator Service Reset Switch is wired to connector J8, pins

3and 4. A momentary single-pole, single-throw (SPST) pushbut- ton with normally open (N.O.) contacts is recommended (Judco 40-4313-00 or equivalent). The contact rating must be at least

50mA at 24 V. When the pushbutton is pressed, the contacts will close across J8, pins 3 and 4. The pushbutton can be located up to 1000 feet away from the RTC-50.

The Generator Service Reset Switch will enable the end-user to retrieve information via the Generator Service Indicator Light indi- cating the number of hours that the generator has run. The Gen- erator Service Indicator Light will flash long (1 second) flashes for each 100-hour interval and short (0.2 second) flashes for each 25- hour interval in that order. The Generator Service Reset Switch may be pressed at any time to retrieve the Generator run time information to the nearest 25 hours.

For example, a Generator run time of 450 hours would be shown as four 100-hour long flashes of 1 second each followed by two 25-hour short flashes of 0.2 seconds each.

Pressing the Generator Service Reset Switch will also turn off the Generator Service Indicator Light if it had been lit.

2.6.2 Transfer Operations Connections

The Utility Close and Gen Close outputs are factory wired to oper- ate the transfer switch. The relay contacts for each output are rated for 5 amps @ 250 VAC. The DC rating is 5 amps @ 30 VDC.

Utility Close Outputs

This output is used to transfer to Utility. The Utility Close Outputs are on J6, pins 5 and 6.

Generator Close Outputs

This output is used to transfer to Generator. The Generator Close Outputs are on J6, pins 3 and 4.

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