14 | SAMLEX AMERICA INC.
SAMLEX AMERICA INC. | 15
5.5.4 Switching Between Grid and Generator
Please refer to Fig. 5.5
This configuration is used in RV application when it is desired to switch between the
Grid Shore Power Cord and the onboard Generator. When the load demand in the RV is
more than the capacity of the Shore Power Cord / the breaker capacity of the RV Park /
Camp Ground connection, the on-board Generator is required to be started. In this case,
the AC loads should transfer to the Generator as soon as the Generator is started and
is ready to take on the load (after a delay of around 20 to 25 sec). This configuration is
also used when utilizing back up Generator to power AC loads if utility power fails and
the Generator is started with Automatic Generator Start Device.
a. Ensure that the Time Delay Circuit is enabled – DIP Switch SW1 should be in OFF
position. (This is the default, factory preset condition).
b. Connect Grid / Shore Power Cord (RV) to the Normally Closed (NC) contacts T-5
and T-6 of the Transfer Relay. The pre-wired 15 A cord (1, Fig 3.1) and NEMA5-
15P plug (2, Fig 3.1) can be used for 15 A service (If it is required to be connected
to a 30 A service, this cord should be replaced with a 30 A cord).
c. Connect the Generator cord to the Normally Open (NO) contacts T3 and T4 of
the Transfer Relay .If convenient, use the knockout and the ¾” cable clamp
provided – marked “Shore” (4, Fig 3.1). Otherwise, use any other convenient
knockout with corresponding cable clamp.
d. Use AWG#10/3 cable to connect the Load Breaker Panel to the Common Con-
tacts T1 and T2 of the Transfer Relay. Use knockout marked "Load" or any other
convenient knockout with appropriate cable clamp (cable clamp not provided).
e
.
Testing of Operation:
(i) Switch OFF both the Grid and the Generator
(ii)
Switch ON the AC input power from the Grid / Shore Power cord (RV). The relay
will remain de-energized and the Grid Power will be transferred to the Main
Panel through Normally Closed Contacts T5
Ò
T1 and T6
Ò
T2. If the Main Panel
circuit breakers are switched on, the AC loads should operate normally.
(iii) Start the Generator. There is a pre-programmed 20 to 25 second delay in the
transfer switch. The delay is designed to allow the Generator a brief warm-up
period. When the delay completes its cycle, the relay will energize, LED1 will be
lighted and the AC loads will transfer to the Generator. An audible click should
sound as the relay energizes.
(iv) Shut down the Generator. As the Generator winds down the relay should de-
energize without chatter or cycling. An audible click should sound as the relay
de-energizes. The load will be transferred back to the Grid.
SECTION 5 |
Installation and Operation
