Delta VFD015CB21A-21 - Symbol explanation

Chapter 3 How to Select the Right AC Motor Drive|C200 Series
3-3
Symbol explanation
M
P
: Motor shaft output for load (kW)
η
: Motor efficiency (normally, approx. 0.85)
ϕ
co
s
: 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 current distortion factor (1.05-1.1, depending on PWM
method)
1C
P
: Continuous motor capacity (kVA)
S
k
: Starting current/rated current of motor
Tn
: Number of motors in parallel
Sn
: 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
Call 1(800)985-6929 for Sales
deltaacdrives.com
sales@deltaacdrives.com
Call 1(800)985-6929 for Sales
deltaacdrives.com
sales@deltaacdrives.com