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