Samlex America STS-30 - Manual (Page 8)

8 | SAMLEX AMERICA INC.
inStallation conFigurationS
general
This Transfer Switch has been especially pre-wired for ease of connections for setting up
a backup power / UPS (Un-interruptible Power Supply) system comprising of an Inverter,
a battery charger and batteries. A backup power system / UPS can be used in on-grid,
off-grid and rV applications. General overview and features for the pre-wired configu-
ration are given below:
- Primary AC power of up to 3600 VA (30A at 120 VAC) can be provided by electric
utility (also called Shore Power Cord or “Cord” in rVs). This is connected to the
Normally open Contacts T3 and T4. NeMA-20r Duplex receptacle (3, fig. 1) has
been provided on the side of the unit for ease of connecting the NeMA5-15P or
NeMA5-20P plug of a battery charger.
- back-up power of up to 3600 VA (30A at 120 VAC) can be provided from an in-
verter. A 15A power cord (1, fig 1) with a 15A, NeMA5-15P plug (2, fig. 1) has been
provided to allow easy, pluggable connection to inverter of up to 1800 VA capacity.
for connecting higher capacity inverter > 1800A & up to 3600 VA, replace the
wiring with AWG#10/3 and connection arrangement rated for 120 VAC, 30A.
Switching between utility/Shore power cord (rV) & inverter
(please see Fig. 1, 2 and 4)
Fig.4. Switching Between Utility and Inverter
SecTIOn 3 | Installation
ON LED1
TERMINALS:
T1 LINE “L”, COMMON
T2 NEUTRAL “N”, COMMON
T3 LINE “L1”, NO
(NORMALLY OPEN)
T4 NEUTRAL “N1”, NO
(NORMALLY OPEN)
T5 LINE “L2”, NC
(NORMALLY CLOSED)
T6 NEUTRAL “N2”, NC
(NORMALLY CLOSED)
T7 (–) INPUT FOR RELAY COIL
T8 (+) INPUT FOR RELAY COIL
T5
T7 T8
T1 T2
T3
20A
FUSE
BATTERY
SIDE FUSE
FOR
INVERTER
BATTERY SIDE
FUSE FOR
CHARGER
INPUT FROM INVERTER
TO NORMALLY CLOSED (NC)
CONTACT TERMINALS T5,T6
OUTPUT TO
AC BREAKER
PANEL
DISCONNECT
THE CONVERTER
EXISITING ON-BOARD
CONVERTER
30 A MAIN
BREAKER PANEL
FIG 4 30 A SYSTEM FOR ALTERNATE SOURCE / INVERTER
INPUT FROM
ELECTRIC UTILITY / SHORE
POWER CORD (RV)
TO NORMALLY OPEN (NO)
CONTACT TERMINALS T3,T 4
30
MAIN
BRANCH CIRCUITS
CONVERTER
1 2 3 4 5
BATTERY
CHARGER
BATTERY
–
+
–
+
INVERTER
–
+
–
+
T4
T6
SW1
TO BATTERY
–
+
NEMA5-20R DUPLEX
RECEPTACLE