Symcom 777, 777-LR, 777-575 Catalog Page
Recordable voltage,
current, last 4 faults,
KWh usage, and power
factor is available when
using communications
package.
Digitally programmable
for precise customizing.
Sixteen set points can
be programmed for
maximum protection.
Last fault memory
provides instant troubleshooting diagnostics.
UL and cUL listed as an
overload relay.
RS485 communication
port for use with
computerized systems
using Modbus protocol.
2880 North Plaza Drive • Rapid City, SD 57702
(800) 843-8848 • (605) 348-5580 • FAX (605) 348-5685
www.symcominc.com • email: sales@symcominc.com
7/04
Features
Applications
Description
The Model 777 can be used on any 3-phase motor drawing 2-800 amps. Applications include
CONVEYOR SYSTEMS, HVAC EQUIPMENT, PUMPS, SAWS, GRINDERS AND OTHER 3-PHASE
ELECTRIC MOTORS.
The Model 777 is a fully-programmable electronic overload relay. An alphanumeric LED display
provides programming and diagnostic information. Sixteen parameters can be programmed in
the Model 777:
1) Low Voltage Setpoint 9) Rapid-Cycle Timer (RD1)
2) High Voltage Setpoint 10) Fault Restart Delay (RD2 - Motor Cool-down Timer)
3) Voltage Unbalance Setpoint 11) Underload Restart Delay (RD3 - Dry Well Recovery Timer)
4) CT Size/Loop Setting 12) No. of restarts after an overload (Manual or Automatic)
5) Overcurrent Trip Point 13) RS485 Address
6) Undercurrent Trip Point 14) No. of restarts after an underload fault
7) Current Unbalance Trip Point 15) Underload Trip Delay
8) Trip Class (5, 10, 15, 20, 30) 16) Ground Fault Trip Point
Programming the Model 777 is an easy four step process: 1) Rotate the MODE SELECT
switch to the parameter to be programmed; 2) Depress and hold the RESET/PROGRAM button;
3) Rotate the DISPLAY/PROGRAM dial to the desired setting as shown in the LED display;
and 4) Release the RESET/PROGRAM button.
An RS-485 port allows the Model 777 to be connected to an RM-1000 or RM-2000 remote
monitor or directly to a computer or PLC. The RM-2000/777 motor management system
combines unsurpassed electronic motor protection and critical, user friendly motor monitoring.
SymCom's Solutions Software (sold separately) can be used to monitor and control up to 99
Model 777s from a central computer. Using Solutions Software, an operator can control motors,
view the operating parameters, and record the following operating parameters:
• Line - Line Voltages (Recordable) • Restart Delay Timers
• Line Currents (Recordable) • KWH Usage (Recordable)
• Last 4 Faults (Recordable) • Power Factor (Recordable)
Model 777
Model 777-LR
Model 777-575
Overload Relays
•
Engineered
Protection
•Overload
•Underload
•Jams
•Undervoltage
•Overvoltage
•Single phasing
•Unbalance
(voltage & current)
•Ground fault (Class II)
•Rapid cycling
•Phase reversal
•Fully programmable
•UL and cUL listed
•CE compliant
•CSA approved
•Automatic or manual
reset
•Tamper guard
•RS485 communications
port
•Surface mount or
DIN rail mount
•Alphanumeric LED
diagnostic display
•Last fault memory
•5 year warranty
•Made in USA
•Network programmable
•Ability to clear last fault
Protects 3-Phase
motors from:
Standard Features
New Features
2880 North Plaza Drive • Rapid City, SD 57702
(800) 843-8848 • (605) 348-5580 • FAX (605) 348-5685
www.symcominc.com • email: sales@symcominc.com
7/04
777 • 777-LR • 777-575
Overload Relays
ABC
CONTACTOR
H1
X1
H1
X1
H1
X1
12 - 16 AWG
Stranded Wire
3 0
MOTOR
CURRENT TRANSFORMER WIRING DIAGRAM FOR MODEL 777 (80 TO 800 AMPS)
SYMCOM RECOMMENDS USING
CTs WITH TERMINALS TO SIMPLIFY
INSTALLATION.
Note: All CTs must face the same direction and all CT
secondaries must be wired identically, i.e. all X1 terminals
enter the main (round) window and returns to H1 terminal
after exiting the loop conductor window (rectangle).
Every CT secondary must make five passes through the
correspondin
g
main conductor window on the model 777.
DISPLAY / PROGRAM
L
3
-L
1
L3-L1
L
B
E
+
O
V
AVG
A
VG
T
L1-L2
L1-L2
L2-L3
L2-L3
C
N
T
C
E
A
A
G
A
V
G
AVG
R
R
U
RD2
UCTD
CUB
LV
MULT
UC
OC
HV
VUB
RD1
TC
GF
RUN
#RU / ADDR
RD3
#RF
MODE SELECT
L1 L2
L3
NO C NC
MODEL 777
OVERLOAD RELAY
DISPLAY MESSAGE
RESET/
PROGRAM
800-843-8848SYMCOM, INC. RAPID CITY, SD
Wiring configuration based on motor amps. Overload T rip Classes
777
External CTs
required. See
wiring diagram
for external
CTs
777-LR
Model
1 - 2
2 - 9
Full Load
Amps
# of
Loops
1
0
# of Conductors
through A, B and C
2
1
MULT to Program
(CT Ratio)
2
1
8 - 12
12 - 25
25 - 90
80 - 110
110 - 160
160 - 220
220 - 320
320 - 420
400 - 520
480 - 600
560 - 800
2
1
0
4
4
4
4
4
4
4
4
3
2
1
5
5
5
5
5
5
5
5
3
2
1
100 (100:5)
150 (150:5)
200 (200:5)
300 (300:5)
400 (400:5)
500 (500:5)
600 (600:5)
800 (800:5)
10000
1000
100
10
0 300 400 500
% of OC Setting
Trip Time (Seconds)
600 700 800 900 1000
Class 10
Class 30
Class 20
Class 15
Class 5
200100
1
Wiring Diagrams
•
Charts
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