Eaton Electrical RTC-50 Manual Do Utilizador

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IB00405004E-70-8664

Page 6

Effective: June 2007

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.  

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.

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. 

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