Typical Transfer Operation | Eaton Electrical RTC-50 instruction

Instructional Booklet

Page 6

Effective: June 2007

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

2.7 Specification Summary

Table 1. RTC-50 Controller Specifications

INPUT VOLTAGE	240 VAC	50/60 HZ
Voltage Measurements of	Utility	Generator
Voltage Measurement Range	0 to 300 Vac RMS (50/60 Hz)

Voltage Measurement Accuracy	± 6 Vac

Undervoltage Dropout	70% of the Nominal 240 Vac Input Voltage

Undervoltage Pickup	80% of the Nominal 240 Vac Input Voltage

Operating Temperature Range	-20 to +70°C (-4 to +158°F)

Storage Temperature Range	-30 to +85°C (-22 to +185°F)

Operating Humidity	0 to 95% Relative Humidity (Non-condensing)

Operating Environment	Resistant to Ammonia, Methane, Nitrogen, Hydrogen,
	and Hydrocarbons

Utility Close and Gen Close Outputs	5 amps @ 250 Vac
	5 amps @ 30 Vdc

Load Shed Contacts #1 and #2	5 amps @ 250 Vac
	5 amps @ 30 Vdc
Applicable Testing	UL Recognized Component
	UL 1008, UL 991 Environmental

IEC 61000-4-2, 61000-4-3, 61000-4-4, 61000-4-5, 61000-4-6, 61000-4-11

CISPR 11, Class B FCC Part 15, Class B

SECTION 3: OPERATION

3.1 General

This section specifically describes the operation and functional use of the RTC-50 controller. The practical use of and operation within each category will be discussed. In this section, it is assumed that prior sections of this manual were reviewed and that the operator has a basic understanding of the hardware.

The RTC-50 controller provides for automatic transfer and re- transfer from source to source. It provides a summary of the RTC-50 controller intelligence and supervisory circuits that con- stantly monitor the condition of both the Utility and Generator power sources, thus providing the required intelligence for transfer operations. These circuits, for example, automatically initiate an immediate transfer of power when the power fails or the voltage level drops below a preset value and an alternate source of power is available.

3.2 Operating Voltage and Measurements

The RTC-50 controller operates on an input voltage of 240 Vac with selectable frequency settings of 50 or 60 Hz.

The RTC-50 controller operates directly from the line sensing inputs of the Utility and Generator power sources.

All voltage monitoring and measurements are true RMS measure- ments.

3.3 Typical Transfer Operation

A typical transfer request will begin with a Utility outage (Utility voltage falls below the 70% dropout level).

When the Generator source meets the requirements to be consid- ered available, the TDNE (Time Delay Normal to Emergency) timer will start timing. TDNE is jumper-programmable at either 20 sec- onds or 50 seconds. The 50 second setting may be used to allow for a longer warm-up period of the Generator. After TDNE times out, the Utility Close Outputs will open, the Gen Close Outputs will close, and the Load Shed Contacts will open. This will con- nect the load to the Generator source but any loads wired to the Load Shed Contacts will be disconnected.

When the Utility becomes available (Utility voltage is above the 80% pickup level), the TDEN (Time Delay Emergency to Normal) timer will start timing. TDEN is a fixed delay of 10 seconds. After TDEN times out, the Gen Close Outputs will open, the Utility Close Outputs will close, and the Load Shed Contacts will be closed. This will connect all loads to the Utility source.

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IB00405004E-70-8664