Use and Care Manual

2008 Cummins Inc. All rights reserved.
2-1
2. Description
This section describes how the basic components
of a transfer switch function.
TRANSFER SWITCH WITH CONTROL
Figure 2-1 shows the operator panel used with
transfer switches with a control. The panel’s fea-
tures are divided into two groups:
S ATS Status LEDs
S Membrane Pushbuttons
ATS Status LEDs
The operator panel includes six LEDs that provide
Automatic Transfer Switch (ATS) status informa-
tion.
Utility Power Available − This green LED is lit
when the utility power source has acceptable output
voltage.
Generator Power Available − This amber LED is lit
when the Generator power source has acceptable
output voltage and frequency.
Both power source LEDs can be lit simultaneously.
Utility Power Connected − This green LED is lit
when the transfer switxh is connected to utility pow-
er which is supplying power to the load.
If this LED is flashing, it means that the transfer
switch has failed to connect to or disconnect from
utility power, when commanded by the control.
Generator Power Connected − This amber LED is
lit when the transfer switch is connected to the gen-
erator set which is supplying power to the load.
If this LED is flashing it means the transfer switch
has failed to connect to or disconnect from the gen-
erator set, when commanded by the control.
Test − This amber LED is lit when there is an active
test period. It flashes twice per second when the
Test pushbutton is pressed to set or cancel a test
period.
Exercise − This amber LED is lit when repeat ex-
ercise periods are set. It flashes twice per second
when the Set Exercise pushbutton is pressed to set
or cancel an exercise. It flashes once per second
during an active exercise period.
Membrane Pushbuttons
The operator panel includes three membrane push-
buttons.
Test − The Test pushbutton is used to start or cancel
a test period.
Override − The Override pushbutton is used to ter-
minate or bypass some time delays, to stop the
Power Connected LEDs from flashing as a result of
a failure to connect to or disconnect from a power
source, and to cancel an active exercise period.
Set Exercise − The Set Exercise pushbutton is
used to enable or disable repeatable exercise peri-
ods using the exerciser. The exerciser is built into
the controller. The exercise period runs for 20 min-
utes and it repeats every 28 days when an exercise
is enabled.