Johnson Controls Frick vyper VYA PG -46 Service Manual page 37

Table B
Parameter
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
1 Applied Motor FLA
2 Applied Service Factor
3 Multiply (Line 1 x Line 2)
4 HP rating of Vyper Drive
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
6 Multiply Line 5 x 1.05
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
Load Inhibit =Applied Motor FLA x 1.1
Force Unload =Applied Motor FLA x 1.12
Warning =Applied Motor FLA x 1.13
Shutdown =Applied Mtr. FLA x 1.15
High Motor Amps
Load Inhibit
Force Unload
Warning
Shutdown
VYPER
Equation Value
Value
340 A
1.15
391 A
305 HP
380 A
399 A
Equation Value
374 A
380 A
384 A
391 A
357
374 Delay
381 5 SEC
389 5 SEC
VARIABLE SPEED DRIVE
™
OPERATION
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
1 Applied Motor FLA
2 Applied Service Factor
3 Multiply (Line 1 x Line 2)
4 HP rating of Vyper Drive
™
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
6 Multiply Line 5 x 1.05
Line 3 value of 614 Amps is greater than Line 6 value of 593
Amps. Therefore, use Table B for the calculation.
Parameter
Load Inhibit
Force Unload
Warning
Shutdown
High Motor Amps
Load Inhibit
Force Unload
Warning
Shutdown
S100-200 IOM (MAY 08)
Parameter
Table B
Equation
= Vyper Amp Limit x 0.97
= Vyper Amp Limit
= Vyper Amp Limit x 1.01
= Vyper Amp Limit x 1.03
548
565
571
581
Page 37
™
Value
534 A
1.15
614 A
437 HP
565 A
593 A
Value
548 A
565 A
571 A
581 A
Delay
5 SEC
5 SEC