Hubbell LX-440 - Manual (Page 9)

Transfer Switch
Page 9 of 16 Pages
Plant Exerciser (B1–B2)
The Plant Exerciser option is a seven-day clock that provides for automatic test operation of the
generator set at pre-selected intervals. The clock is powered by a fused circuit from control transformer
XFMR3. The Plant Exerciser option is used in conjunction with contacts to initiate engine starting
without a load transfer, option B1. Option B2 includes a selector switch to simulate a power failure with
or without a load transfer.
Refer to section 8, pages 14-15, for instructions to program the Plant Exerciser timer.
Remote Test (R7)
This option provides terminal points for the connection of remote devices that are normally closed and
wired in series with the
TEST push button. An open circuit simulates failure of the normal source and
initiates transfer to the emergency source.
Selector Switch (R2–R4)
Selector switches are available to set the transfer switch for testing, automatic or manual mode, and to
test start the engine for troubleshooting and maintenance. Selector switches with an OFF position,
option R2, include an OFF indicating light (PL4, white). Switches with a
TEST position initiate a load
transfer.
NEUTRAL POSITION TIME DELAY (N)
When the normal source contacts open, the NEUTRAL POSITION TIME DELAY starts. The timer circuit on
the TCR board, temporarily disconnects the power source to the switching mechanism while the
automatic transfer switch is in the neutral position (normal and emergency source contacts open). The
adjustable timer is usually set for three seconds. The red START DELAY LED indicates the timer is
counting. After the delay, the green END DELAY indicates the TR (timer relay) is energized to reconnect
power to the switching mechanism.