Symcom 777-LR-TS Installation Guide

INSTALLATION INSTRUCTIONS FOR SYMCOM'S

MODEL 777-LR-TS ELECTRONIC OVERLOAD RELAY, 2 - 10 AMPS

BE SURE POWER IS DISCONNECTED PRIOR TO INSTALLATION!!

FOLLOW NATIONAL, STATE AND LOCAL CODES!

READ THESE INSTRUCTIONS ENTIRELY BEFORE INSTALLATION.

FIGURE 1: Typical Wiring Diagram

TABLE 1: Wiring Configuration
Based on Motor Amps

CONNECTIONS

1. Using the four corner tabs OR the DIN rail mounting bracket, mount the Model 777-LR-TS directly
above or below the magnetic contactor. To use the DIN rail bracket, hook the top clip first, then apply
downward pressure until the lower clip "clicks" onto the rail.

2. Insert the motor conductors through the round holes marked "A", "B", and "C." Terminate the
conductors at the line or load side of the magnetic contactor. Note: For motors with full load
amps less than 2.0 Amps, loop the conductors through the holes marked "A", "B", and "C"
according to Table 1 below. The rectangular holes behind the holes marked "A", "B" and "C"
are provided for wire looping (see Figure 1).

3. Connect the three-phase power from the line side of the contactor to "L1", "L2" and "L3".
First insert a #14 - #18 AWG wire into the top of the terminal marked L1 and tighten the screw on
the front of the overload relay. Then, connect the other end of the wire to the line side of the
contactor. Repeat these two steps for L2 and L3 (see Figure 1).

4. Connect the output relay to the circuitry to be controlled (see Figure 1). To control a motor,
connect the normally open contact in series with the magnetic coil of the motor starter as shown.
To sound an alarm, connect the normally closed contact in series with the alarm (not shown).

277 VAC

DISPLAY / PROGRAM

L3-L1L3-L1

L

B

E

+

O

V

AV
G

VG

T

L

1

-

L

2

L1-L2

L

2

­L

3

L2-L3

C

N

T

C

E

A

A

G

AV
G

VG

R

R

U

RD2 UCTD

CUB

LV

MULT

UC

OC

HV

VUB

RD1TCGF

RUN

#RU / ADDR

RD3

#RF

MODE SELECT

L1 L2

L3

NO C NC

MODEL 777-LR

OVERLOAD RELAY

LOW RANGE, 2-10 AMPS

DISPLAY MESSAGE

RESET/
PROGRAM

800-843-8848SYMCOM, INC. RAPID CITY, SD

2880 North Plaza Drive, Rapid City,SD 57702 • [phone]

FIGURE 2: Unit Face and Display

PROGRAMMING

1. Select the feature to program by rotating the
"MODE SELECT" switch to the desired
position. The "MULT" setting must be
programmed before any of the current
settings to ensure proper display of actual
current setpoints. Therefore, SymCom
recommends programming the "LV" setting
first, then move clockwise through the
postions to complete the process.

2. Push and hold the “RESET / PR OGRAM”button.

3. Rotate the “DISPLAY / PROGRAM”adjustment to the desired setting of the feature as shown in the LED display.

4. Release the “RESET/PROGRAM” button.The Model 777-LR-TS is programmed when the button is released.

5. Continue steps 1-4 until all features are programmed.

NOTE: Some "MODE SELECT" positions are dual function such as the "#RU / ADDR" position. When
the "MODE SELECT" switch is pointed at "#RU / ADDR," y ou may view and program "#RU" and

"ADDR."
To view the two settings, rotate the "DISPLAY / PROGRAM" adjustment across its entire range. You will
see the "#RU" setting when the "DISPLAY / PROGRAM" adjustment is between approximately 7 o'clock
and 11 o'clock. You will see the "ADDR" setting when the "DISPLAY / PROGRAM" adjustment is
between approximately 11 o'clock and 5 o'clock.

To program "#RU" or "ADDR,# follow the programming instructions above. The "#RU" setting will only
be progrrammed when the "DISPLAY / PROGRAM" adjustment is between approximately 7 o’clock and
11 o’clock. Likewise, the "ADDR" setting will only be programmed when the "DISPLAY / PROGRAM"
adjustment is between approximately 11 o’clock and 5 o’clock. "ADDR" settings will be an "A" followed
by a number between 1 and 99.

SUGGESTED SETTINGS (Consult the Motor Manufacturer for their recommendations.)

[Be sure to read the programming example on page 5.]

LV/HV- The recommended settings for "LV" (low voltage) and "HV" (high voltage) depend on many

factors such as motor usage, motor size, environmental factors and tolerance of the motor. The
motor manufacturer should be consulted for "HV" and "LV" settings. However, the NEMA MG1
standard recommends that "LV" and "HV" be set to no more than ±10% of the motor's nameplate
voltage. The setting can be determined by multiplying the motor's nameplate voltage by the
recommended percent over and under voltage. (eg., The motor nameplate voltage is 230 V,
set "LV" to 0.9x230=207, set "HV" to 1.10x230=253) "LV" can not be set higher than "HV",
so "HV" may have to be adjusted higher before the proper "LV" setting can be programmed.

VUB/TS- "VUB" is the voltage unbalance trip point. The NEMA MG1 standard does not recommend

operating a motor above a 1% voltage unbalance without derating the motor.Voltage unbalance
is determined from the following formula:
% Voltage Unbalance = [(Maximum Deviation from the Average) / Average] x 100%
The NEMA MG1 standard also recommends against operating a motor above a 5% voltage
unbalance under any circumstances. Therefore, a setting of "5" is a good place to start but
SymCom recommends consulting the motor manufacturer for specific tolerances.
Note: A setting of "999" in this position will eliminate voltage unbalance and single phase protection.

"TS" allows the user to turn the temperature sensor trip function on or off. The 777-LR-TS will
only detect high temperatures when used with a *Subtrol®-equipped submersible motor.

*Subtrol is a registered trademark of Franklin Electric Co., Inc.

IND. CONT. EQ.

LISTED

784X

/TS

MODEL 777-LR-TS

4/03 - 2 -

TABLE 2: Trip Class Descriptions

MUL

T- "MULT" is the multiplication factor for determining true current settings and represents the

number of conductors passing through the main current windows marked "A", "B" and "C," or
current transformer ratio of external CTs. The appropriate number can be determined from
Table No.1 on page 1. "MULT" must be correctly programmed in order to accurately program the
current settings.

OC- Represents the manufacturer's maxim

um service factor amperage.

The "OC" (overcurrent)
setting depends on many factors such as motor usage, motor size, environmental factors and
tolerance of the motor. The motor manufacturer should be consulted for "OC" settings.
However, "OC" is typically between 110% and 125% of full load amperage (FLA).

UC- The "UC" (undercurrent) setting is typically set to 80% of full load amperage (FLA). The overload

relay with a "UC" setting of 80% of FLA will typically detect a loss of load for many pumps and
motors such as a dry well condition for submersible pumps. The "UC" setting may be set to 0.00
to disable undercurrent (loss of load) protection.

CUB- "CUB" is the current unbalance trip point. Most motor manufacturers recommend operating under

no more than 5% current unbalance, therefore, a setting of "5" is a good place to start. However,
your motor manufacturer should be contacted for exact settings.

Note: A setting of "999" in this position will eliminate current unbalance and single phase protection.

TC- "TC" designates the trip class for overload protection. The tr ip class defines the trip delay when

an overload is detected (see Table 2). Trip class is determined by the type of motor and
application. Your motor manufacturer should be consulted for the proper setting. The following
table shows the trip class and a general description of the applications.

RD1- "RD1" is the rapid cycle timer. It will engage when the motor is first powered-up or after the motor

controls shut down the motor. An "RD1" setting of 20-30 seconds will generally protect the motor
from rapid, successive power outages or short cycling caused by the motor controls. A setting
of 0 seconds will allow the motor to start immediately after power-up or after a normal shutdown.

RD2- "RD2" is the restart delay after the overload relay trips on current unbalance, single phasing and

overload (if "oc" is programmed in "#RF"). This delay allows the motor to cool down after
experiencing the above faults. It is also known as a motor cool down timer. Your motor
manufacturer should be contacted to determine this setting. Under normal circumstances, a
setting of 5-10 minutes will give the motor enough time to cool down between faults.

RD3- "RD3" is the restart delay after an undercurrent. It is also known as a dry well recovery timer and

is usually used in submersible pumping applications. The setting of "RD3" depends on the
recovery time of the water well and varies widely from application to application.

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- 3 - 4/03