IB00405004E-70-8664 For more information visit: www.eaton.com
Instructional Booklet
Effective: June 2007 Page 5
Instruction Manual for the Eaton RTC-50 Automatic Transfer Switch Controller
2.5 Go To Generator Input
The RTC-50 has a control input signal that will initiate a transfer
from Utility to Generator. The input requires an external contact
closure to the Go To Generator input (J6, pins 1 and 2).
The Control Input “State” definitions are as follows.
Connected - When the input is shorted by an external contact or
connection.
Unconnected - When the input is NOT shorted by an external con-
tact or connection.
The Go To Generator Input operations are defined as follows.
When this input (J6, pins 1 and 2) is in the “Connected” state, the
RTC-50 will initiate a transfer from Utility to Generator. The Gen-
erator must be manually started or the Utility sensing wires must
be interrupted in order to initiate an engine start. After the Gener-
ator 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.
2.6 Output Connections
The RTC-50 output connections are divided into two categories:
•Customer Connections
•Transfer Operation Connections.
2.6.1 Customer Connections
Load Shed Contacts
There are two sets of load shed contacts for customer use on con-
nector J7, Load Shed Contacts #1 and Load Shed Contacts #2.
Both sets of contacts are closed when the transfer switch is in the
Utility position and both sets are open when the transfer switch is
in the Generator position. The output contacts are rated for 5
amps @ 250 VAC. The DC rating is 5 amps @ 30 VDC.
Generator Service Indicator Light
The Generator Service Indicator Light is wired to connector J8,
pins 1 and 2. A 5mm panel-mount LED with a maximum current
rating of 25 mA is recommended (Dialight 559-5101-007F or
equivalent). The LED can be located up to 1000 feet away from
the RTC-50.
The LED is polarity sensitive. The red lead must be wired to J8,
pin 1 and the black lead must be wired to J8, pin 2. If the wiring
is reversed, the LED will not light.
The RTC-50 will track the number of hours that the generator has
run. It will then turn on the Generator Service Indicator light to
indicate that routine maintenance is required for every 25 hours
that the generator has run. This will constitute one maintenance
cycle.
The RTC-50 will keep track of the number of hours that the gener-
ator has run for up to 1000 hours. At this point, the counter will
roll over and start again. The information is stored in non-volatile
memory so that the value is retained when there is a loss of
power.
The end-user will press the Gen Service Reset Switch to retrieve
the generator run time information. The indicator will flash both
long and short flashes to indicate the number of hours the genera-
tor has run. Each long flash (1 second) of the indicator equals
100 hours of run time and each short flash (0.2 second) equals 25
hours of run time.
Generator Service Reset Switch
The Generator Service Reset Switch is wired to connector J8, pins
3 and 4. A momentary single-pole, single-throw (SPST) pushbut-
ton with normally open (N.O.) contacts is recommended (Judco
40-4313-00 or equivalent). The contact rating must be at least
50 mA at 24 V. When the pushbutton is pressed, the contacts
will close across J8, pins 3 and 4. The pushbutton can be located
up to 1000 feet away from the RTC-50.
The Generator Service Reset Switch will enable the end-user to
retrieve information via the Generator Service Indicator Light indi-
cating the number of hours that the generator has run. The Gen-
erator Service Indicator Light will flash long (1 second) flashes for
each 100-hour interval and short (0.2 second) flashes for each 25-
hour interval in that order. The Generator Service Reset Switch
may be pressed at any time to retrieve the Generator run time
information to the nearest 25 hours.
For example, a Generator run time of 450 hours would be shown
as four 100-hour long flashes of 1 second each followed by two
25-hour short flashes of 0.2 seconds each.
Pressing the Generator Service Reset Switch will also turn off the
Generator Service Indicator Light if it had been lit.
2.6.2 Transfer Operations Connections
The Utility Close and Gen Close outputs are factory wired to oper-
ate the transfer switch. The relay contacts for each output are
rated for 5 amps @ 250 VAC. The DC rating is 5 amps @ 30
VDC.
Utility Close Outputs
This output is used to transfer to Utility. The Utility Close Outputs
are on J6, pins 5 and 6.
Generator Close Outputs
This output is used to transfer to Generator. The Generator Close
Outputs are on J6, pins 3 and 4.