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Instruction Booklet
IB 70-8698
Instruction Manual for the Eaton RTC-100
Automatic Transfer Switch Controller
eaton Corporation
www.eaton.com
Effective December 2009
2.7 Specification Summary
Table 1. RTC-100 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 Vdc1
Applicable Testing
UL Recognized Component
UL 991 Humidity
IEC 61000-4-2, 61000-4-3, 61000-4-4, 61000-4-5,
61000-4-6, 61000-4-11, 61000-3-2, 61000-3-3
CISPR 11, Class B
FCC Part 15, Class B
Engine Start Contacts
5 amps @ 250 Vac
5 amps @ 30 Vdc
Section 3: operation
3.1 General
This section specifically describes the operation and functional use
of the RTC-100 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-100 controller provides for automatic transfer and re-trans-
fer from source to source. It provides a summary of the RTC-100
controller intelligence and supervisory circuits that constantly moni-
tor 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-100 controller operates on an input voltage of 240 Vac with
selectable frequency settings of 50 or 60 Hz.
The RTC-100 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 volt-
age 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 seconds
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 connect 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.
If used with two wire start generators, a time delay engine start
(TDES) will time down when utility voltage is below the 70% drop-
out. This time delay of 6 seconds allows the utility to return to nor-
mal before the generator is started. A time delay engine cool (TDEC)
timer will time out after the transfer switch transfers load back to the
utility This timer allows the generator to properly cool down before
it is shut down. The timer allows the generator to run unloaded for 5
minutes.
