2880 North Plaza Drive, Rapid City, SD 57702 • (800) 843-8848
INSTALLATION INSTRUCTIONS
FOR SYMCOM’S MOTORSAVER
MODEL 250600
CONNECTIONS
1.Mount the MotorSaver in a convenient location in or near the motor control
panel. If the location is wet or dusty, then the MotorSaver should be
mounted in a NEMA 4 or 12 enclosure.
2.Connect the three lines of the motor’s three-phase power supply to L1, L2
and L3 on the MotorSaver’s terminal strip
3.Connect the output relay to the circuitry to be controlled (see Figure No. 1
and Figure No. 2).
A. To control a motor, connect the normally open contact in series with the
magnetic coil of the motor starter as shown in Figure 1.
B. To sound an alarm, connect the normally closed contact in series with the
alarm as shown in Figure 2.
The Model 250600 is a three-phase voltage monitor designed to protect motors
regardless of horsepower. It will protect 50 to 60 Hz motors from damage
caused by single phasing, phase reversal, voltage unbalance, low voltage and
high voltage. Added features include DPDT contacts and an adjustable restart
delay.
Figure No.1: Typical Motor Control Wiring Diagram
SETTINGS
POWER-UP
Turn on the power to the motor. The MotorSaver® then goes through its restart
delay and the LED will flash green (see Table 1). After the restart delay, the
MotorSaver® will energize its output contacts and the RUN LIGHT will turn solid
green. If the contacts do not energize and the RUN LIGHT does not turn solid
green, then see the TROUBLESHOOTING section.
07/16/03 -2-
1.LINE VOLTAGE ADJUSTMENT: Rotate the LINE VOLTAGE ADJUSTMENT to
the nominal three-phase secondary voltage of the potential transformer.
2.TIME DELAY RESTART (RESTART DELAY): Rotate the RESTART DELAY to
the desired position. The restart delay is the time between the MotorSaver®
seeing acceptable power and the MotorSaver® closing its output contacts. The
restart delay should be set appropriately for the individual application. If the
RESTART DELAY is in the MAN (manual) position, then the unit will not
automatically restart until it is turned out of the MAN position.
Figure 2: Typical Alarm Wiring Diagram
Table 1: Diagnostic Indicator Lights
RUN
RESTART DELAY
REVERSE PHASE
UNBALANCE / SINGLE PHASE
HIGH / LOW VOLTAGE
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.
* The 520 Series has a one (1) year warranty and the LSRU series has a two (2) year warranty.
-3- 07/16/03
SYMPTOM
LIGHT
PATTERN SOLUTION
No lights are on. The unit
seems completely dead
N/A
Measure the three line-to-line voltages. If any of
the voltages are below 150 VAC, the MotorSaver
does not have enough power to operate its internal
electronics. This may occur on a single-phased
system. If the voltages are correct, call SymCom at
1-800-843-8848 or 1-605-348-5580.
Red light is blinking
(On initial installation
power up).
Turn off the three-phase power. Swap any two
leads powering the MotorSaver (L1, L2, or L3).
There is a 50-50 chance of connecting L1, L2, and
L3 correctly the rst time. Re-apply the three-phase
power.
Red light is blinking
(After the motor has been
previously running).
The incoming lines have been reverse phased. The
MotorSaver is preventing the motor from running
backwards. Correct the phase sequence.
Red light is blinking in this
pattern.
The voltage is unbalanced or single-phased.
Measure the incoming line voltages and calculate
the % unbalance. If the voltage unbalance does not
exceed the % unbalance reset value, call SymCom
at 1-800-843-8848 or 1-605-348-5580.
Red light is on steady.
The voltage is out of tolerance. Measure the three
line-to-line voltages. Calculate the average of
the three voltages. If the average is 7% above or
below the nominal voltage as selected by the LINE
VOLTAGE ADJUST, the MotorSaver is functioning
properly. If the voltage is within ±7% of the selected
line voltage, call SymCom at 1-800-843-8848 or
1-605-348-5580.
Green light blinks, but
motor is not running.
The MotorSaver is in restart delay.
Green light is on steady,
but motor does not start.
The MotorSaver is in run mode. Ensure other control devices are allowing the motor to start. Check
control circuit for loose wires or
malfunctioning switches.
TROUBLESHOOTING
2880 North Plaza Drive, Rapid City, SD 57702
Phone:(800) 843-8848 or (605) 348-5580
FAX: (605) 348-5685
Visit our website at www.symcominc.com for our
complete catalog and new product listings!
SPECIFICATIONS
3-Phase Line Voltage 475 to 600 VAC
Frequency 50 or 60 Hz
Note: 50 Hz will increase all delay timers by 20%
Low Voltage (% of setpoint)
Trip 90%
Reset 93%
High Voltage (% of setpoint)
Trip 110%
Reset 107%
Voltage Unbalance (NEMA)
Trip 6%
Reset 4.5%
Trip Delay Time
Low / High Voltage Faults 4 Seconds
Unbalance / Phasing Faults 2 Seconds
Restart Delay Time
After a fault or complete power loss Adjustable Manual, 2-300 Seconds
Output Contact Rating - DPDT
Pilot Duty
480 VA @ 240 VAC
General Purpose
10 A @ 240 VAC
Transient Protection IEC 1000-4-5 ; 1995 ± 6 kv
Power Consumption 5 Watts (maximum)
Weight 14 Ounces
Terminal
Wire AWG 12-22 Gauge
Maximum Torque 7 inch-pounds
Operating Temperature -40o to +70o C
UL E68520
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