Left Arrow Key-
The left arrow key is used to scroll thru screens
1 to 6. The screen sequence will be repeated after screen 6. Note:
The right arrow key does not scroll in reverse.
Load Shedding Control
Model LSC-04
Screen 1
Screen 2
Screen 3
Screen 4
Screen 5
Screen 6
Screens 1 to 5 are used to adjust the Amperage and time delays in the load shedding program. Note that screen 4 “
Gen
Actual Cur”
is not adjustable and is reading the amperage interpreted by the CT input. Also note that screen 6
displays the real time state of the output relays on the controller. Screen 7 indicated the NO or NC Mode of operation.
The LSC-04-S is a standalone load shedding controller designed to work with any single phase generator and a broad
range of connected load types controlled by DRY CONTACTS. The controller can be set for 2 different configurations
as follows.
Normally open Mode
is selected when
I2 = 0
this mode is designed to work with loads that use a normally
open state for control purposes like normally closed relays. The
Normally Closed Mode
is selected when
I2 = 24 V
DC
. This mode is designed to work with normally closed control circuits like low voltage HVAC control wires and
normally open contactors.
Operation:
The internal program starts to run on power up. At startup all relays will revert to their active state,
NO
Configuration
will close and
NC Configuration
will open. All relays will remain in their active state for the
duration of the
Delay Shed
period set by
DR01
. After
DR01
times out the program will look at the value of
Gen
Full Load DR02
to determine the maximum amps available. A comparator circuit will look at the assigned
amperage rating of
DR03 Relay1
and the
Gen Actual Cur reading
, (this will always be determined by the higher of
the 2 CT inputs). When capacity is available
Relay1
will revert to the NORMAL STATE and turn the load on.
After the load is restored the program will pause for the number of seconds set by input setting
DR0A Stabilize
Time.
After the delay period the program will compare the
Gen Actual Cur reading,
with
Gen Full Load DR02
and the amps assigned to
RELAY2 DR04,
if the comparator program determined capacity is available
RELAY2
will revert to its normal state turning on load 2. This sequence is repeated for
RELAY3 DR05
and
RELAY4 DRO6
.
Any time the
Gen Actual Cur reading
exceeds 90% of
Gen Full Load DR02
All relays will revert to their active
state removing all four of the loads from the circuit. The program will then repeat the process restoring one load at a
time until additional capacity is no longer available.
Programming Screens
Theory Of Operation
Screen 7
