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PROGRAMMING EXAMPLES 

 

Example #1 

 
Motor to be protected: 3-phase, 460 Volt, 25 hp air compressor with a full load amperage rating of 
34A and maximum service factor amps of 37.4. Use the following calculations and reasoning to 
determine the appropriate settings for this application. 

 
LV- 

460 x 0.90 = 414 

HV-  

460 x 1.10 = 506 

VUB/TS- 

Standard NEMA motor = 5, TS turned on. 

MULT- 

From Table 1 = 1 

OC-  

Service Factor Amperage = 37.4 

UC-  

FLA x 0.80 = 34A x 0.80 = 27.2 

CUB-  

Standard NEMA motor = 5 

TC-  

General purpose motor = 20 

RD1-  

Since this compressor takes about 10 seconds to bleed off excess pressure after a 
shutdown, setting RD1 = 20 will allow the compressor to unload before being restarted. 

RD2-  

Because the motor may be hot from running in an unbalance or single-phase 
condition, a motor cool-down time of 10 minutes, RD2 = 10, should be appropriate. 

RD3/#RU-   Because an undercurrent would signal a serious problem in this application (a broken 

shaft or belt), #RU should be set to 0 for a manual reset. Therefore, RD3 does not 
have any function 

#RF-  

Because an overload (overcurrent) fault signals a serious problem in this application 
(e.g., worn bearings), "oc" should not be included in the #RF setting so that a manual 
reset after an overload fault is required. A #RF=1 will give the system 1 chance to 
recover from an unbalance or single phasing problem before manual reset is required. 

UCTD-  

Setting UCTD = 5 will allow normal operation and not allow the motor to run too long in 
a failure mode. 

GF-  

A ground fault setting of 15% of full load amps will be a significant indicator that the 
motor should be evaluated for repair or replacement. Therefore, GF = 34A x 0.15 = 
5.1. 

 

Example #2 

 

Motor To Be Protected: 3-phase, 230 Volt, 5 hp submersible pump with a full load amperage of 
15.9A and maximum service factor amps of 18.2. Use the following calculations and reasoning to 
determine the appropriate settings for this application. 

 
LV- 

230 x 0.90 = 207 

HV- 

230 x 1.10 = 253 

VUB/TS- 

Manufacturer suggests VUB = 5, TS turned on. 

MULT- 

From Table 1, MULT = 2, 1 loop of main conductor 

OC- 

Service Factor Amperage = 18.2 

UC- 

FLA x 0.80 = 15.9 x 0.80 = 12.7 

CUB- 

Manufacturer suggests 5 

TC- 

From Figure 3, for this (and most) submersible pumps, TC = 10 (fast trip) 

RD1- 

To protect the pump from rapid cycling, RD1 = 60 

RD2- 

Since the motor is small and submerged in water, the motor will generally cool down 
quickly. RD2=5 

RD3- 

The well history shows that it will fully recover in 2 hours. RD3 = 120 

Summary of Contents for 777-TS

Page 1: ...perages from 26 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 s...

Page 2: ...XTERNAL CTs REQUIRED SEE FIGURE 2 FOR WIRING EXTERNAL CTs 91 110 5 100 100 5 111 160 5 150 150 5 161 220 5 200 200 5 221 320 5 300 300 5 321 420 5 400 400 5 421 520 5 500 500 5 521 620 5 600 600 5 621...

Page 3: ...3 1 05 Figure 2 Typical Wiring Diagram Using External CTs Figure 3 Looping Example Showing Three Conductors MULT 3 from table 1 No other necessary connections are shown...

Page 4: ...efore the maximum deviation from the average is 5 3 The VUB is then 5 3 208 3 x 100 2 5 The TS setting allows the user to turn the temperature sensor trip function on or off MULT MULT multiplier setti...

Page 5: ...ck position to the 11 o clock position ADDR settings start after the 11 o clock position RU of restarts after an undercurrent is the number of restarts after an undercurrent trip condition before the...

Page 6: ...ntil all parameters are programmed OPERATION The relay operation of the Model 777 TS is designed to be fail safe This means when everything is within the limits programmed into the unit the relay will...

Page 7: ...15 Specialized applications 20 Standard Trip Most NEMA rated general purpose motors will be protected by this setting 30 Slow Trip Motors with long acceleration times 10 seconds or high inertia loads...

Page 8: ...n e g worn bearings oc should not be included in the RF setting so that a manual reset after an overload fault is required A RF 1 will give the system 1 chance to recover from an unbalance or single p...

Page 9: ...ual line line voltage The display is also used for programming the operating parameters of the device The display also identifies what caused the unit to de energize its relay or what is keeping the u...

Page 10: ...vides isolation signal conditioning for compatibility with Modbus RTU and RS 485 networks and provides terminals for terminating the shielded communications cable Up to 99 units can be installed on on...

Page 11: ...meter value The incoming voltage is not within the limits programmed in the VUB HV and LV settings Adjust the DISPLAY PROGRAM switch to read the incoming line voltage values Correct the incoming power...

Page 12: ...irect Trip Times Those not shown have user selectable trip times Ground Fault Trip Time 101 200 of Setpoint 201 300 of Setpoint 301 400 of Setpoint 401 or Greater Trip time 8 seconds 1 second 4 second...

Page 13: ...C Undercurrent Threshold 0 10 98A MULT or 40 100 of CT Primary CUB Current Unbalance Threshold 2 25 or 999 TC Overcurrent Trip Class 5 J5 10 J10 15 J15 20 J20 30 J30 RD1 Rapid Cycle Timer 0 2 500 Seco...

Page 14: ...button 4 Turn MODE SELECT switch to RUN The program is now locked but all settings can be viewed The unit can be unlocked by following the same steps except adjust the DISPLAY PROGRAM knob to unL in...

Page 15: ...ng s electrical installation in order to be available to the authority having jurisdiction 9 Confirm programmed parameters and proceed with installation instructions GROUND FAULT TEST RESULTS Date Per...

Page 16: ...16 1 05 Visit our website at www symcominc com for our complete catalog and new product listings 2880 North Plaza Drive Rapid City SD 57702 800 843 8848...

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