Symcom LSRU Catalog Page

Load Sensor

Model LSRU

The Model LSRU load sensors use current levels to mon­itor all types of over and underload conditions such as
feed rates, tool wear, pump loads, mixer viscosity and
others. They may be used to stage pumps, chillers and
other machinery. Two user adjustments are provided
with your choice of overcurrent, undercurrent, trip de­lay, restart delay and extended restart delay options.
Three current ranges, 0-10A, 5-25A and 25-100A, are
available.

OPERATION:
Model LSRU load sensors are fail-safe devices. If some­thing should happen to the device to make it inoperable,
such as a surge, the relay contact will open, thus opening
the contactor it is controlling and save the motor from
the surge.

The output relay de-energizes when the current exceeds
the over or under current setpoints. After the restart de­lay times out, the relay will close its output relay, letting
the motor start back up. If the current level is unaccept­able, the relay will trip after the trip delay expires. If the
current drops to zero, the LSRU will recognize a normal
stop and will not de-energize it’s relay.

[phone] / [phone] / Fax [phone]

[e-mail] / [e-mail]

Specications

Functional Specications

Current Ranges

-1.5

-2

-3
Adjustment options
Overcurrent
Undercurrent
Trip Delay
Restart Delay
Extended Restart Delay
Motor Acceleration Time
Accuracy
Current
Timing
Isolation

Input Characteristics

Supply Voltage
24V Range
115V Range
Frequency

Output Characteristics

Output Contact Rating-SPDT Form C 480VA@240VAC Pilot Duty

General Characteristics

Operating Temperature
Terminals
Wire AWG
Torque
Power Consumption
Standards Passed
CSA and CSA-NRTL/C
Dimensions
Weight
Mounting Method

0 to 10 Amps
5 to 25 Amps
25 to 100 Amps

Adj. through entire Amp range*
Adj. through entire Amp range*

0.5 to 60 seconds**
Manual and 0.5 to 300 seconds**
Manual and 0.5 to 300 minutes**
2 seconds***

+2%
+10%
600VAC

18 to 30VAC
90 to 135VAC
50 to 60Hz

10A@240VAC General Purpose

-40o to 70o C (-40o to 158o F)

#12 - 24
7 in.-lbs.
2 Watts (max.)

LR 46510-35

2.30” L x 1.72” H x 3.55” D

5.5 oz.
Surface Mount

* Note: Overcurrent adjustment cannot be set below the undercurrent adjustment nor can the undercurrent adjustment be set above the overcurrent
adjustment for proper operation.

** Note: Delays are xed at 0.5 seconds, if not selected as an adjustement. Unit cannot have both trip and restart delay adjustment.

*** Note: Over and undercurrent levels are ignored for 2 seconds from the instant the device sees motor current.

How to order:
Available Models:

LSRU-24-AL-2 LSRU-115-OU-1.5 O - Overcurrent

LSRU-24-AL-3 LSRU-115-OU-2 U - Undercurrent
LSRU-115-AL-1.5 LSRU-115-OU-3 R - Restart Delay
LSRU-115-AL-2 LSRU-115-UE-2 T - Trip Delay
LSRU-115-AL-3 LSRU-115-UR-2 E - Extended Restart Delay
LSRU-115-FC-1.5 LSRU-115-UR-3 (in minutes)
LSRU-115-OR-1.5 LSRU-115-UT-2 AL - Alarm Logic
LSRU-115-OR-2 LSRU-115-UT-3 FC - Feed Control
LSRU-115-OT-1.5
LSRU-115-OT-2

LSRU-115-OT-3

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