INSTALLATION INSTRUCTIONS
FOR SYMCOM’S OVERLOAD RELAY
MODEL 777-
575-
FT
BE SURE POWER IS DISCONNECTED PRIOR TO INSALLATION!
FOLLOW NATIONAL, STATE, AND LOCAL CODES!
READ THESE INSTRUCTIONS ENTIRELY BEFORE INSTALLATION!
SymCom’s electronic overload relays are fully programmable for customized
protection with a digital readout and RS-485 communications. The 777-FT also
has a fast linear trip mode.
2880 North Plaza Drive, Rapid City, SD 57702 • (800) 843-8848
CONNECTIONS
1. Using the four corner tabs or the DIN rail mounting bracket, mount the
unit near 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.
2.1 For amperages from 26-90 amps, insert the motor conductors from the top of
the unit through the holes marked ‘A’, ‘B’, and ‘C’. Make certain that 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.
2.2 For amperages less than 26 amps, loop the motor conductors according to
Table 1. Figure 2 shows an example of the looping required for current ranging
from 8.1 to 12 amps (MULT=3).
2.3 For amperages greater than 90 amps, external CT’s (current transformers)
are required. SymCom recommends CT’s with terminals be used for ease of
installation. All CT secondaries must make five passes through the round
holes on the MotorSaver. See Figure 3 for a typical wiring diagram using
external CT’s.
NOTE: Pay close attention to the diagrams to eliminate any power factor
errors.
3. Connect the three phase power from the line side of the contactor to ‘L1’, ‘L2’,
and ‘L3’ terminals using 12-18AWG copper wire.
4. Connect the control circuit wires to the appropriate terminals. The relay is a
fail safe design so the ‘NO’ contact should be in series with the coil on the
contactor for motor control (see Figure 4). For alarm circuits, the ‘NC’ contact
is in series with the alarm circuitry (not shown).
