Appendix C How to Select the Right AC Motor Drive
VFD-EL-W
C-3
Symbol explanation
M
P
Motor shaft output for load (kW)
η
Motor efficiency (normally approx. 0.85)
ϕ
cos
Motor power factor (normally approx. 0.75)
M
V
Motor rated voltage (V)
M
I
Motor rated current (A), for commercial power
k
Correction factor calculated from the current distortion factor
(1.05–1.1, depending on PWM method)
1
C
P
Continuous motor capacity (kVA)
S
k
Starting current/rated current of the motor
T
n
Number of motors in parallel
S
n
Number of simultaneously started motors
2
GD
Total inertia (GD
2
) calculated back to motor shaft (kg m
2
)
L
T
Load torque
A
t
Motor acceleration time
N
Motor speed
Summary of Contents for VFD-EL-W Series
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Page 21: ...Chapter 1 Introduction VFD EL W 1 14 This page intentionally left blank ...
Page 34: ...Chapter 2 Installation and Wiring VFD EL W 2 13 This page intentionally left blank ...
Page 42: ...Chapter 3 Keypad and Start up VFD EL W 3 8 This page intentionally left blank ...
Page 150: ...Chapter 4 Parameters VFD EL W 4 108 This page intentionally left blank ...
Page 152: ...Chapter 5 Troubleshooting VFD EL W 5 2 5 1 Over Current oc ...
Page 153: ...Chapter 5 Troubleshooting VFD EL W 5 3 5 2 Over Voltage ov ...
Page 154: ...Chapter 5 Troubleshooting VFD EL W 5 4 5 3 Low Voltage Lv ...
Page 155: ...Chapter 5 Troubleshooting VFD EL W 5 5 5 4 Overheat oH1 ...
Page 156: ...Chapter 5 Troubleshooting VFD EL W 5 6 5 5 Overload oL ...
Page 157: ...Chapter 5 Troubleshooting VFD EL W 5 7 5 6 Keypad Display is Abnormal 5 7 Phase Loss PHL ...
Page 158: ...Chapter 5 Troubleshooting VFD EL W 5 8 5 8 Motor Does Not Run ...
Page 159: ...Chapter 5 Troubleshooting VFD EL W 5 9 5 9 Motor Speed Cannot be Changed ...
Page 163: ...Chapter 5 Troubleshooting VFD EL W 5 13 This page intentionally left blank ...
Page 179: ...Appendix A Specifications VFD EL W A 6 This page intentionally left blank ...