3.3.Single-phase voltage input: If only single-phase, 120V control power is
available, insert control power into L1 and L2 inputs (See Figure 2c). L3
does not need to be connected. When single-phase voltage input is used,
single-phase faults are detected only after the motor starts and reverse phase
protection is not available.
NOTE: VUB setting must be set to “999” for proper operation with single-
phase voltage input.
4. Connect the output relay to the circuitry to be controlled (see Figure No. 3).
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).
FULL LOAD
AMPS
CT RATIO
PASSES THROUGH
777 WITH CT
SECONDARY
MULT PROGRAM SETTING
12.5-25
50:5
2
25
25-50
50:5
1
50
50-75
75:5
1
75
75-100
100:5
1
100
100-150
150:5
1
150
150-200
200:5
1
200
200-300
300:5
1
300
300-400
400:5
1
400
400-500
500:5
1
500
500-600
600:5
1
600
TABLE NO. 1: EXTERNAL CT SELECTION
Operation
The relay operation of SymCom’s overload relays is a fail safe design. This
means when everything is within the limits programmed into the unit, the relay
will energize; the normally open (NO) contact will close and the normally closed
(NC) contact will open. Once the unit has been wired and programmed, the unit
is ready to operate. Turn the mode select to the “RUN” position. The display will
show “RUN” alternating with a number (the numbers displayed will be the number
corresponding to where the “DISPLAY/PROGRAM” knob is pointed). It will do
this for the amount of time programmed into “RD1”. After this time has expired,
the relay will energize (normally open will close and normally closed contact will
open). If something else is in the display, see the troubleshooting section for
more information. If the mode select is taken out of the “RUN” position, the units
relay will de-energize.
06/26/03
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