Samlexpower STS-30 Owner's Manual - Section 3 |
6 | SAMLEX AMERICA INC.
SecTIOn 3 |
Installation
- Internal DIP Switch ( SW1, fig 2) for enabling or disabling delayed transfer
to generator
- Internal LeD (LeD1, fig 2) for indicating energized condition of the transfer relay coil
(r1, fig 2) and for diagnostics
operation oF the tranSFer relay (pleaSe See Fig 2)
relay r1 is a Double Pole Double Throw (DPDT) relay and is used to switch power from
one source to the other. The relay coil is energized as soon as 110 VDC is fed to terminals
T7 and T8. When the relay coil is de-energized, the common contact terminals T1 and
T2 are connected to the Normally Closed (NC) contact terminals T5 and T6 respectively.
When the relay coil is energized, the common contact terminals T1 and T2 switch over
to the Normally open (No) contact terminals T4 and T5.
The relay coil operates at 110 VDC. This voltage is generated and controlled by the cir-
cuitry located on PCb1. 120 VAC is tapped from contact terminals T3 and T4, is rectified
and made available to the relay coil terminals T7 and T8 through a time delay circuit.
DIP Switch SW1 located on the PCb1 is used to enable or disable the time delay circuit.
When the Time Delay Circuit is enabled (SW1 in off position (1). This is the factory
default preset position), 110 VDC control signal for energizing the relay coil is delayed
by around 20 to 25 sec from the time 120 VAC is made available at the No contact ter-
minals T3 and T4. When the time delay circuit is disabled (DIP Switch in oN position), the
110 VDC control signal for energizing the relay coil is made available to terminals T7 and
T8 as soon as 120 VAC is made available at the No terminals T3 and T4.
As soon as the 110 VDC control signal is fed to the relay coil to terminals T7 and T8, the
green LeD 1 lights up indicating that the relay coil has energized.
The delay of around 20 to 25 sec is required when the AC load is transferred to the gen-
erator. The generator should never be started on load. Also, the generator takes around
20 to 25 sec to stabilize in voltage and frequency.
SaFety inStructionS
Connections for stand by / backup power to a building / rV system using the transfer
switch must be made by a qualified electrician and must comply with all applicable laws
and electrical codes.
- before starting installation, disconnect all live sources or power. Make sure that the
generator is off, the external shore power cord is unplugged, and the inverter, if
any, is shut off.
- The unit is not weather proof and should be mounted in a cool, dry and protected
environment.
- To prevent exposure to foreign contaminants, do not mount the transfer switch
in an engine compartment, under kitchen sink drains or water pipes, within the
battery compartment, or in any compartment designed for storage of flammable
liquids such as gasoline.