Johnson Controls Frick vyper VYC PGF-46 - Page 37

VYPER
™
VARIABLE SPEED DRIVE
OPERATION
S100-200 IOM (MAY 08)
Page 37
Table B
Parameter Equation Value
Load Inhibit = Vyper Amp Limit x 0.97
Force Unload = Vyper Amp Limit
Warning = Vyper Amp Limit x 1.01
Shutdown = Vyper Amp Limit x 1.03
Set the appropriate calculated values into the High Motor
Amps section.
Example 1
What are the High Motor Amp setpoints if a 305 HP Vyper
™
is to drive a motor with 1.15 SF and a 340 Amp FLA? Using
the Values, determine whether Table A or Table B should be
used to calculate the setpoints.
Line Parameter Value
1 Applied Motor FLA 340 A
2 Applied Service Factor 1.15
3 Multiply (Line 1 x Line 2) 391 A
4 HP rating of Vyper Drive 305 HP
5 Vyper Amp Limit
If Line 4 is 305/254 HP, value is 380 A
If Line 4 is 437/362 HP, value is 565 A
380 A
6 Multiply Line 5 x 1.05 399 A
Line 3 value of 391 Amps is less than Line 6 Value of 399
Amps. Therefore, use Table A for the calculation.
Table A
Parameter Equation Value
Load Inhibit =Applied Motor FLA x 1.1 374 A
Force Unload =Applied Motor FLA x 1.12 380 A
Warning =Applied Motor FLA x 1.13 384 A
Shutdown =Applied Mtr. FLA x 1.15 391 A
High Motor Amps
Load Inhibit 357
Force Unload 374 Delay
Warning 381 5 SEC
Shutdown 389 5 SEC
Example 2
What are the High Motor Amp setpoints if a 437 HP Vyper
™
is to drive a motor with 1.15 SF and a 534 Amp FLA? Using
the Values, determine whether Table A or Table B should be
used to calculate the setpoints.
Line Parameter Value
1 Applied Motor FLA 534 A
2 Applied Service Factor 1.15
3 Multiply (Line 1 x Line 2) 614 A
4 HP rating of Vyper Drive 437 HP
5 Vyper Amp Limit
If Line 4 is 305/254 HP, value is 380 A
If Line 4 is 437/362 HP, value is 565 A
565 A
6 Multiply Line 5 x 1.05 593 A
Line 3 value of 614 Amps is greater than Line 6 value of 593
Amps. Therefore, use Table B for the calculation.
Table B
Parameter Equation Value
Load Inhibit = Vyper Amp Limit x 0.97 548 A
Force Unload = Vyper Amp Limit 565 A
Warning = Vyper Amp Limit x 1.01 571 A
Shutdown = Vyper Amp Limit x 1.03 581 A
High Motor Amps
Load Inhibit 548
Force Unload 565 Delay
Warning 571 5 SEC
Shutdown 581 5 SEC