Frick Vyper 572, Installation Operation & Maintenance

Page: 47 / 76

VYPER
™
VARIABLE SPEED DRIVE
OPERATION
100-210 IOM (
JUL
09)
Page 47
Example 3
(See Figures 52 and 53) What are the High Mo-
tor Amp setpoints if a 700 HP Vyper is to drive a motor with
1.00 SF and a 679 Amp FLA? Using these values, determine
whether Table A or Table B should be used to calculate the
setpoints.
Motors with a 1.00 SF need to be derated by dividing the
Nameplate FLA by 1.15 or an Applied motor FLA. This is
calculated as shown:
679 Amps
= 590 Amps
1.15
Line Parameter Value
1 Applied Motor FLA 590 A
2 Applied Service Factor 1.15
3 Multiply (Line 1 x Line 2) 679 A
4 HP rating of Vyper Drive 700 HP
5 Vyper Amp Limit
If Line 4 is 700/572 HP, value is 880 A
If Line 4 is 912/752 HP, value is 1180 A
880 A
6 Multiply Line 5 x 1.05 924 A
Figure 52 - Ex. 3 Motor Amps Safety Calculation Table
The value of Line 3 is 679 Amps; this is less than Line 6
Value of 924 Amps. Therefore, use Table A (Table 17) for
High Motor Amp setpoint calculation. Refer to Figure 47 for
the locations to enter calculated values.
Table A - High Motor Amp Setpoint Calculations
Parameter Equation Value
Load Inhibit =Applied Motor FLA x 1.1 747 A
Force Unload =Applied Motor FLA x 1.12 760 A
Warning =Applied Motor FLA x 1.13 767 A
Shutdown =Applied Motor FLA x 1.15 780 A
Figure 53 - Ex. 3 Motor Amp Setpoint Calculations (Table A)
Example 4
(See Figures 54 and 55) What are the High Motor
Amp setpoints if a 912 HP Vyper ™ is to drive a motor with
1.00 SF and a 1245 A FLA? Using these values, determine
whether Table A or Table B should be used to calculate the
setpoints.
Motors with a 1.00 SF need to be derated by dividing the
Nameplate FLA by 1.15 or an Applied motor FLA. This is
calculated as shown:
1245 Amps
= 1082 Amps
1.15
Line Parameter Value
1 Applied Motor FLA 1082 A
2 Applied Service Factor 1.15
3 Multiply (Line 1 x Line 2) 1245 A
4 HP rating of Vyper Drive 912 HP
5
Vyper Amp Limit
If Line 4 is 700/572 HP, value is 880 A
If Line 4 is 912/752 HP, value is 1180 A
1180 A
6 Multiply Line 5 x 1.05 1239 A
Figure 54 - Ex. 4 Motor Amps Safety Calculation Table
The value of Line 3 is 1245 Amps; this is greater than the Line
6 value of 1239 Amps. Therefore, use Table B (Table 18) for
the calculation. Refer to Figure 47 for the locations to enter
calculated values.
Table B - High Motor Amp Setpoint Calculations
Parameter Equation Value
Load Inhibit = Vyper Amp Limit x 0.97 1144 A
Force Unload = Vyper Amp Limit 1180 A
Warning = Vyper Amp Limit x 1.01 1191 A
Shutdown = Vyper Amp Limit x 1.03 1215 A
Figure 55 - Ex. 4 Motor Amp Setpoint Calculations (Table B)
VFD Setpoints
(See Figures 46 and 56)
This section of the Motor Screen describes programmable
parameters that regulate the loading and unloading response
of the Vyper ™ Variable Speed (Frequency) Drive (VFD). The
speed limits of the motor control are set in this section of the
page. There are various control strategies which are unique
to specific industries. The following pages will show some
suggestions that can be used as starting points. Specific
applications may require additional adjustment.
Figure 56 - Motor Screen VFD Setpoints
Programming the Motor Screen VFD Setpoints - Setting
the Motor Screen properly is critical to the optimal perfor-
mance of the Vyper
™
.
The operator must understand how the Motor Screen VFD
parameters affect the functionality of the Vyper ™ unit. These
setpoints affect the reaction speed of the VSD when ac-
celerating and decelerating as well as affect the interaction
between the codes and the slide valve.
Maximum Drive Output Speed - This parameter sets the limit
for the highest allowable motor speed in terms of percent-
age. The maximum allowable setting is 100%, or full speed.
Some applications may require the maximum motor speed to
be limited. The Maximum Percentage parameter range can
be set from 0 to 100%. However, Frick recommends that the
Maximum percentage is always set to a higher value than the
Minimum Percentage parameter setting.