INSTALLATION INSTRUCTIONS FOR THE
MODEL 777-P, 777-575-P, 777-HVR-P
ELECTRONIC OVERLOAD RELAY
BE SURE POWER IS DISCONNECTED PRIOR TO INSTALLATION!
FOLLOW NATIONAL, STATE AND LOCAL CODES.
READ THESE INSTRUCTIONS ENTIRELY BEFORE INSTALLATION.
The Model 777-P is a solid-state (electronic) overload relay. It is fully programmable for customized
protection and is designed to protect 3-phase systems with operating voltages of 190-480VAC (500-
600VAC for the Model 777-575-P). The output relay is a Form C contact, which can control a
contactor or other device within the output relay contact rating. The unit can be programmed prior to
installation by applying 120VAC to terminals L1 and L2 (except Model 777-575-P). The unit cannot
be tested for proper operation using this voltage. For testing purposes, 3-phase power must be
applied with a minimum voltage of 190VAC (450VAC for the Model 777-575-P). The 777-P offers
more advanced network programmable features than the 777 and will work with SymCom’s
DeviceNet COM-DN and CIO-DN; and Modbus RS485MS-2W Communications Modules.
CONNECTIONS
1. Disconnect power and verify power is off.
2. Using the four corner tabs or the DIN rail mount, install the 777-P directly above or below the
contactor. To use the DIN rail mount, hook the top clip first then apply downward pressure until
the lower clip snaps onto the rail.
3. A) For amperages from 25-90 amps, insert the motor conductors through the holes marked A, B,
and C. Make certain the conductor through each hole corresponds to the right motor
conductor, i.e. the A phase conductor should go through the A round hole. See Figure 1 for a
typical wiring diagram.
B) For amperages less than 25 amps, loop the motor conductors according to Table 1. Figure 3
shows an example of the looping required for current ranging from 8-12 amps (MULT=3).
C) For amperages greater than 90 amps, external CTs (current transformers) are required.
SymCom recommends using CTs with terminals for ease of installation. All CT secondaries
must make five passes through the round holes on the MotorSaver
®
Plus. See Figure 2 for a
typical wiring diagram using external CTs.
NOTE: Pay close attention to this diagram to eliminate any power factor errors, when
ommunicating with the device through the RS-485 network.
c
4. Connect the 3-phase power from the line side of the contactor to L1, L2, and L3 terminals using
12-18 AWG copper wire. These should be tightened to no more than 7 inch lbs.
5. Connect the control circuit wires to the appropriate terminals. The relay is designed for fail-safe
operation, thus the NO (normally open) contact should be in series with the coil on the contactor
for motor control (see Figure 1). For alarm circuits, the NC (normally closed) contact is in series
with the alarm circuitry.
2880 North Plaza Drive, Rapid City, South Dakota 57702
(800) 843-8848
·
(605) 348-5580
·
fax (605) 348-5685
HTU
www.symcom.com
