For more information visit: www.eaton.com
IB70-8671
Instructional Booklet
Page
6
Effective: July 2008
O & M Manual for the EGS AutomaticTransfer Switch
with RTC-50 Control and Integral Loadcenter - 100 Amp
3.3 RTC-50 Logic Panel
The RTC-50 is a microprocessor-based transfer switch logic con-
trol package. The hardware and software of the controller contain
the intelligence/supervisory circuits that constantly monitor the
condition of the power sources. It provides the intelligence neces-
sary for the operation of the ATS (Figure 5).
Figure 5. RTC-50 Logic Control Panel.
The RTC-50 controller has an operating temperature of
-20 to 70°C (-4 to 158°F).
The controller circuit board is protected by an insulating conformal
coating.
The specifications, under normal operating conditions, are as fol-
lows:
•
Tolerance for voltage sensing function: ±1% of full scale
3.4 EGS ATS Features
A variety of standard and optional features are available for Eaton
ATSs.
All features or combinations of features may not be avail-
able on specific ATSs
. All features and/or accessories are Under-
writers Laboratories (UL) listed unless noted.
3.4.1 Standard Features
The following is a list of the standard features for the RTC-50
Controlled ATS.
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 seconds or 50 seconds. Default is
20 seconds.
3.
Time Delay Emergency to Normal (TDEN)
This feature provides a time delay of the re-transfer opera-
tion to permit stabilization of Utility. Timing begins when the
Utility becomes available. If the Generator fails during tim-
ing, then re-transfer is delayed for up to 6 seconds to allow
the generator to recover.
Fixed at 10 Seconds.
5.
Generator Monitoring and Protection
This feature provides monitoring and protection based on the
Generator voltage setpoints. All feature functions are Fail-
safe operations.
5J. All Phase Undervoltage Protection
Undervoltage:
Dropout: 70% of nominal
Pickup: 80% of nominal
12. Power Source Annunciation
This feature provides LEDs to give power source availability
indications.
Switch Position
Provides LEDs to indicate the switch position
Power Source Availability
Provides LEDs to indicate if a power source is available.
LEDs may be integral or separate from the controller.
12G. Utility - Available
This feature provides a green LED that, when lit, indicates
the Utility is available.
12H. Generator - Available
This feature provides an red LED that, when lit, indicates
the generator is available.
15M. Load Shed
Two sets of contacts are available and can be used to con-
trol large connected loads on the generator (i.e. air condi-
tioners, hot tubs, etc.). The contacts are rated for 250 Vac,
5 amps.
26.
Utility - Monitoring and Protection
This feature provides Utility monitoring and protection func-
tions. If the Utility power supply fails, then the RTC-50 will
begin the sequence of operations necessary to transfer the
load circuit to the Generator power supply. All Feature 26
monitoring and protection functions are Failsafe operations.
26P. All Phase Undervoltage Protection
Undervoltage:
Dropout: 70% of nominal
Pickup: 80% of nominal
