INSTALLATION INSTRUCTIONS
FOR SYMCOM’S LOAD SENSOR
MODEL LSRU-FC
BE SURE POWER IS DISCONNECTED PRIOR TO INSALLATION!
FOLLOW NATIONAL, STATE, AND LOCAL CODES!
READ THESE INSTRUCTIONS ENTIRELY BEFORE INSTALLATION!
The Model LSRU-FC is a load monitor intended to control feed mechanisms in a
variety of applications. The Model LSRU-FC optimizes these systems by
stopping the feeder when the grinder, chipper, saw or auger nears overload.
When the load is reduced to a preset level, the feeder is restarted. The LSRU-FC
trips at the overcurrent setpoint and resets at the undercurrent setpoint.
INSTALLATION
1. Mount the Model LSRU-FC near one of the conductors of the load being
monitored. If the unit will be used in a dusty or wet environment, an
appropriate NEMA rated enclosure should be used.
2. Insert one of the conductors of the load through the sensor hole in the
LSRU-FC.
a) For currents greater than 1 amp, proceed to step #3.
b) For currents less than 1 amp, the conductor must be looped. Refer
to the table below to determine the number of conductors needed
through the sensor window.
NOTE: The OC and/or UC trip points must be set based on ‘I
eff
’ for
current range 1 units.
ACTUAL CURRENT NUMBER OF CONDUCTORS EFFECTIVE CURRENT (I
0.5 - 1.0 3 1.5 - 3.0
0.25 - 0.5 5 1.25 - 2.5
For values less than 0.25 consult the factory.
)
eff
3. Turn the user adjustments to the desired settings.
4. Wire the appropriate control voltage to L1 and L2.
5. Connect the output relay to the control circuitry. The proper wiring scheme
may vary depending on the required action when a fault occurs. (A wiring
diagram is shown in Figure 1 that utilizes the NO contact.)
2880 North Plaza Drive, Rapid City, SD 57702 • (800) 843-8848
LSRU
Unit Description
Model # Voltage Range Options Current Range
024 - 18 to 30 VAC
115 - 90 to 135 VAC
1 - 0 to 5 Amps
2 - 5 to 25 Amps
3 - 25 to 100 Amps
F C
OL
OL
OL
MAGNETIC
CONTACTOR
L1
L2
L3
GRINDER
OR
OTHER
MOTOR
LSRU-FC
L1 L2
THREE PHASE POWER
OL
OL
OL
FEED
MOTOR
MAGNETIC
CONTACTOR
THREE PHASE POWER
L1
L2
L3
OL
CONTROL POWER
6. Energize the load to be monitored. Verify normal running amps have been
achieved. The LED will be lit under normal operating conditions (the current
sensed is at an acceptable level) indicating the output contacts are energized
(NO is closed and NC is open).
NOTE: The LSRU-FC is a fail-safe design, meaning the NO (normally
open contact) will be open if the LSRU fails or control power is
interrupted.
7. The installation is now complete.
FIGURE 1: TYPICAL WIRING DIAGRAM
Any questions or comments call SymCom at 1-800-843-8848 or
1-605-348-5580
SymCom warrants its microcontroller based products against defects in material or workmanship
for a period of ve (5) years from the date of manufacture. All other products manufactured by
SymCom shall be warranted against defects in material and workmanship for a period of two (2)
years from the date of manufacture. For complete information on warranty, liability, terms, and
conditions, please refer to the SymCom Terms and Conditions of Sale document.
08/09/03 -2-
MODEL LSRU-FC SPECIFICATIONS
FC
CONTROL VOLTAGE
LSRU-024-xx-x 18 - 30 VAC
LSRU-115-xx-x 90 - 135 VAC
FREQUENCY 50 to 60 Hz
POWER 2 Watts (Maximum)
CURRENT RANGE
LSRU-xxx-xx-1 0 - 5 Amps
LSRU-xxx-xx-2 5 - 25 Amps
LSRU-xxx-xx-3 25 - 100 Amps
ADJUSTMENTS
Overcurrent (can not be set below UC) Adjustable through entire current range
Undercurrent (can not be set above OC) Adjustable through entire current range
FIXED TRIP DELAY(not selected as an option) 1 Seconds
FIXED RESTART DELAY(not selected as an option) 0.5 Second
MOTOR ACCELERATION TIME 2 Seconds
REPEATABILITY
Current ±2%
Timing ±10%
ISOLATION 600 VAC
OUTPUT CONTACT RATING - SPDT
Pilot Duty Rating 480 VA @ 240 VAC
General Purpose Rating 10 A @ 240 VAC
OPERATING TEMPERATURE -400 to +700 C
TERMINALS
Wire AWG #12 - #24
Maximum Torque 7 inch-pounds
STANDARDS PASSED
CSA and CSA-NRTL/C LR 46510-35
-3- 08/09/03
Visit our website at www.symcominc.com for our
complete catalog and new product listings!
2880 North Plaza Drive, Rapid City, SD 57702
Phone: (800) 843-8848 or (605) 348-5580
FAX: (605) 348-5685
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