Page 1
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.
Fast linear trip can prevent
mechanical damage.
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
http://www.symcominc.com • email: sales@symcominc.com
11/03
Features
Applications
Description
The Model 777-FT can be used on any three phase motor drawing from 2-800 amps. It’s linear
trip feature can be set to trip in as little as 320ms, allowing one to protect mechanical drives
from breaking chains, shear pins, etc. This product has been specifically designed for waste
water, conveyor, lift gate and other applications where shock relays are used.
The Model 777-FT 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-FT:
1) Low Voltage Set Point 9) Rapid Cycle Timer (RD1)
2) High Voltage Set Point 10) Overload Restart Delay (RD2)
3) Voltage Unbalance Set Point 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) Linear 16) Ground Fault Trip Point
An RS-485 port allows the Model 777-FT to be connected to an RM-2000 remote monitor or
directly to a computer or PLC. The RM-2000/777-FT 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 777-FTs
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-FT
Model 777-LR-FT
Model 777-575-FT
Overload Relays
•
Engineered
Protection
•Overload
•Underload
•Jams
•Under Voltage
•Over Voltage
•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:
Additional Features
New Features
Page 2
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
11/03
Specifications
•
Operating Points
•
Special Options
777-FT • 777-LR-FT • 777-575-FT
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 THAT HAVE TERMINALS TO AID
CONVENIENCE WHEN INSTALLING CTs
Note: All CTs must be faced 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
corresponding main conductor window on the model 777.
DISPLAY / PROGRAM
L3-L1
L3-L1
L
B
E
+
O
V
A
V
G
AVG
T
L1-L2
L1-L2
L
2
-L
3
L2-L3
C
N
T
C
E
A
A
G
A
V
G
A
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
OVERLOAD RELAY
DISPLAY MESSAGE
RESET/
PROGRAM
800-843-8848SYMCOM, INC. RAPID CITY, SD
Wiring configuration based on motor amps. Overload Trip Classes
777-FT
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
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Dimensions for All 777 Units
Model 777-FT Overloads are fully programmable three phase
electronic overload relays. They can be used as a stand alone
product or networked via the Modbus RS-485 port. A computer,
PLC or other control device can be used to monitor and control
the Model 777-FT overload relays.
The Model 777-FT includes three built-in current transformers
(CTs) which will handle applications up to 90 amps. External
current transformers can be implemented to handle higher
amperage applications.
The following 16 set points can be viewed from the three digit
LED displays or from a networked computer: undervoltage trip
point, overvoltage trip point, voltage unbalance trip point, CT
size/loops setting, overcurrent trip point, undercurrent trip point,
current unbalance trip point, overload trip class
(5,10,15,20,30), rapid cycle timer (RD1), overload restart delay
(RD2), underload restart delay (RD3), number of starts after an
overload, voltage and current unbalance, single phasing
(manual or automatic), RS485 address, number of restarts after
an underload fault, underload trip delay, and ground fault trip
point. Individual line voltages and current levels, as well as
average voltage and average current, can also be viewed while
the motor is running.
*Contact SymCom for information on medium voltage applications.
Specifications
•
Operating Points
•
Special Options
777-FT • 777-LR-FT • 777-575-FT
Overload Relays
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
11/03
Page 4
NOTES: SymCom's 777-FT & 777-LR-FT can be preprogrammed prior to installation by applying 120 VAC between
the L1 and L2 terminals.
* 575 volt Model (MS 777-575-FT)
** If J prefix is displayed in trip class setting, jam protection is enabled.
*** If "oc" is disabled in the #RF setting, the overcurrent will be included as a normal fault and the relay will automatically
restart after RD2 expires,otherwise, manual reset is required after an overcurrent fault.
Specifications
Model 777-FT,
Model 777-LR-FT &
Model 777-575-FT
11/03
Electrical
Input Voltage 200-480 VAC, 3Ø(Standard)
500-600VAC for model 777-575
Frequency 50-60 Hz
Motor Full Load Amp Range
777, 777-575 777-LR, 777-575-LR
2-25 Amps, 3Ø (Loops Required) 1-4.5 Amps, 3Ø(Loops Required)
25-90 Amps, 3Ø(Direct) 2-9 Amps, 3Ø(Direct)
80-800 Amps, 3Ø(External CTs)
Short Circuit Rating 10kA
Power Consumption 10W (Maximum)
Output Contact Rating SPDT (Form C) Pilot duty rating: 480 VA @ 240 VAC
General purpose: 10A @ 240 VAC
Expected Life
Mechanical
1 x 106 operations
Electrical
1 x 105 operations at rated load
Accuracy at 25° C (77° F)
Voltage ±1%
Current ±3%(<100 Amps Direct)
GF Current ±15%
Timing 5% ± 1 second
Repeatability
Voltage ± 0.5% of nominal voltage
Current ± 1% (<100 amps direct)
Trip Times (Those not shown have user selectable trip times.)
Ground Fault Trip Time Trip time
101%-200% of Setpoint 8 seconds ± 1 second
201%-300% of Setpoint 4 seconds ± 1 second
301%-400% of Setpoint 3 seconds ± 1 second
401% or Greater 2 seconds ± 1 second
Current Unbalance Trip Times
% Over Setpoint Trip time % Over Setpoint Trip time
1% 30 seconds 5% 6 seconds
2% 15 seconds 6% 5 seconds
3% 10 seconds 10% 3 seconds
4% 7.5 s econ ds 15% 2 sec onds
Safety Marks
UL UL508, UL1053
CE IEC 60947-1, IEC 60947-5-1
Standards Passed
Electrostatic Discharge (ESD) IEC 1000-4-2, Level 3, 6kV contact, 8kV air
Radio Frequency Immunity (RFI), Conducted IEC 1000-4-6, Level 3 10V/m
Radio Frequency Immunity (RFI), Radiated IEC 1000-4-3, Level 3 10V/m
Fast Transient Burst IEC 1000-4-4, Level 3, 3.5 kV input power
Surge
IEC 1000-4-5
Level 3, 2kV line-to-line; Level 4, 4kV line-to-ground
ANSI/IEEE C62.41 Surge and Ring Wave Compliance to a level of 6kV line-to-line
Hi-potential Test Meets UL508 (2 x rated V +1000V for 1 minute)
Vibration IEC 68-2-6, 10-55Hz, 1mm peak-to-peak, 2 hours, 3 axis
Shock IEC 68-2-27, 30g, 3 axis, 11ms duration, half-sine pulse
Mechanical
Dimensions 3.1"H x 5.1"D x 3.9"W
Termnal Torque 7 inch•lb
Enclosure Material Polycarbonate
Weight 1.2 lbs
Maximum Conductor Size Through 777 0.65" with insulation
Environmental
Temperature Range Ambient Operating: -20° - 70° C (-4° - 158° F)
Ambient Storage: -40° - 80° C (-40° - 176° F)
Pollution Degree 3
Class of Protection IP20, NEMA 1
Relative Humidity 10-95%, non-condensing per IEC 68-2-3
Programmable Operating Points Range
LV- Low Voltage Threshold 170V (450V*) - HV Setting
HV- High Voltage Threshold LV Setting - 528V (660V*)
VUB- Voltage Unbalance Threshold 2 - 15% or 999
MULT- # of Conductors or CT Ratio (XXX:5) 1-10 Conductors or 100-800 Ratio
OC- Over Current Threshold (20 to 100A) ÷ MULT or 80 to 120% of CT Primary; LR, (2 to 10A) ÷ MULT
UC- Under Current Threshold (0, 10 to 98A) ÷ MULT or 40 to 100% of CT Primary; LR. (0, 1 to 9.8A) ÷ MULT
CUB- Current Unbalance Threshold 2 - 25% or 999
TC- Over Current Trip Class ** 5, J5, 10, J10, 15, J15, 20, J20, 30, J30, J00 (J00 = Linear)
RD1- Rapid Cycle Timer 0, 2 - 500 Seconds (x 0.5 if TC = J00)
MA- Motor Accelleration Timer (0 to 500) x 0.158 Seconds = (0 to 79 Seconds)
RD2- Restart Delay After All Faults Except Under Current 2 - 500 Minutes (x 0.5 if TC = J00)
(motor cool down timer)
OCTD - Overcurrent Trip Delay (Linear) (2 to 500) x 0.158 Seconds = (0.32 to 79 Seconds)
RD3- Restart Delay After Under Current 2 - 500 Minutes (x 0.5 if TC = J00)
(dry well recovery timer)
#RU- Number of Restarts After Under Current 0, 1, 2, 3, 4, A(Automatic)
ADDR- RS485 Address A01- A99
#RF-Number of Restarts After All Faults Except Undercurrent*** 0, 1, oc1, 2, oc2, 3, oc3, 4, oc4, A, ocA
UCTD- Under Current Trip Delay 2 - 60 Seconds
GF- Ground Fault Current Threshold (3 to 20A) ÷ MULT or 10 to 30% of CT Primary or OFF; LR, (0.3 to 2.0A) ÷ MULT or OFF
SymCom warrants its microcontroller based
products against defects in material or workmanship
for a period of five (5) years from the date of
manufacture. All other products manufactured by
SymCom shall be warranted against defects in
material and workmanship for a period of two (2)
years from the date of manufacture. For complete
information on warranty, liability, terms returns,
and cancellations, please refer to the SymCom
Te rms and Conditions of Sale document.
777-P1. . . . 77-575-P1
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