Eaton RTC-50 Instruction Manual download pdf (Page 4)

Instruction Booklet IB 70-8698

Instruction Manual for the Eaton RTC-100

Automatic Transfer Switch Controller

EATON CORPORATION www.eaton.com

Effective December 2009

1.5 Functions/Features

The primary function of RTC-100 controller is to accurately monitor

the Utility and Generator power sources and provide the necessary

intelligence to operate the ATS in an appropriate and timely man-

ner. In addition, the RTC-100 controller provides status information

through on-board and remote indicators.

The following is a list of the features of the RTC-100 controller.

1. Time Delay Normal to Emergency (TDNE)

This feature provides a time delay when transferring from the

Utility to the Generator power source. Timing begins when

the Generator becomes available. It permits controlled trans-

fer of the load circuit to the Generator.

Jumper selectable at 20 or 50 seconds. Default is 20 sec-

onds.

2. Time Delay on Engine Starting (TDES)

This feature provides a time delay of the signal to initiate the

engine/generator start cycle in order to override momentary

power outages or voltage fluctuations of the utility source.

Fixed setting of six seconds (For 2 wire start only)

Some generators have their own time delay start.

3. Time Delay Emergency to Normal (TDEN)

This feature provides a time delay of the re-transfer operation

to permit stabilization of Utility source. Timing begins when

the Utility becomes available. If the Generator fails during

timing, then re-transfer is delayed for up to 6 seconds to allow

the generator to recover.

Fixed at 10 Seconds.

4. Time Delay for Engine Cool-down (TDEC)

This feature provides a time delay of the signal to initiate the

engine/generator stop cycle after the re-transfer operation.

This allows the engine/generator to cool down by running

unloaded. Timing begins on completion of the re-transfer

operation.

Fixed setting of five minutes.

5. Generator Monitoring and Protection

This feature provides monitoring and protection based on the

Generator voltage setpoints. All feature 5 functions are fail-

safe operations.

5J. All Phase Undervoltage Protection

Dropout: 168 Vac (70% of 240 Vac nominal)

Pickup: 192 Vac (80% of 240 Vac nominal)

7. Time Delay Emergency Fail (TDEF)

This feature provides a time delay that prevents a connected

Generator source from being declared “failed” in order to

override momentary generator fluctuations. If the Generator

remains in the failed state then, after the TDEF timer expires,

the transfer switch will proceed with the programmed

sequence for re-transfer (if the utility source is available).

Fixed setting of 6 Seconds

12. Power Source Annunciation

This feature provides LEDs to indicate power source

availability.

12C. Utility - Connected - EGSU Only

This feature provides a white LED that when lit, indicates the

utility is connected.

12D. Generator - Connected - EGSU Only

This feature provides a yellow LED that when lit, indicates the

generator is connected.

12G. Utility - Available

This feature provides a green LED that, when lit, indicates that

the Utility is available.

12H. Generator - Available

This feature provides a red LED that, when lit, indicates that

the Generator is available.

15N. Load Shed (Active)

Two sets of contacts are available and can be used to control

large connected loads on the generator (i.e. air conditioners,

hot tubs, etc.). The contacts are rated for 250 Vac, 5 amps.

See section 4.1.4 for connection and operation.

23K. Generator Test Selectable - Off / 7 14 / 28 Day Interval

This feature provides for automatic test operation of the

generator. Available test cycles are 7, 14, or 28 days with a

15-minute duration.

Programmable jumpers allow for selection of three test

cycles:

•

Generator Start/Run Only (No Load);

•

Generator Test with Load Transfer; or

•

Disabled

This is a “Failsafe” operation.

26. Utility - Monitoring and Protection

This feature provides Utility monitoring and protection func-

tions. If the Utility power source fails, then the RTC-100 will

begin the sequence of operations necessary to transfer the

load circuit to the Generator power source. All Feature 26

monitoring and protection functions are failsafe operations.

26D. Transfer to Generator

This feature provides the capability for an external contact clo-

sure to initiate a transfer from Utility to Generator. After the

Generator 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. A

connection point for the connection of an external contact is

provided.

26P. All Phase Undervoltage Protection

Dropout: 168 Vac (70% of 240 Vac nominal)

Pickup: 192 Vac (80% of 240 Vac nominal)

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