Delta C2000 series User Manual page 525

2.3 When it is running continuously
The requirement of load capacity should be less than the capacity of AC motor drive(kVA)
The requirement of load capacity=
×
k P
M
η
×
cos
The motor capacity should be less than the capacity of AC motor drive
× ×
k 3
The current should be less than the rated current of AC motor drive(A)
×
k I
M
Symbol explanation
P : Motor shaft output for load (kW)
M
η
: Motor efficiency (normally, approx. 0.85)
ϕ
cos
: Motor power factor (normally, approx. 0.75)
V
: Motor rated voltage(V)
M
I : Motor rated current(A), for commercial power
M
k
: Correction factor calculated from current distortion factor (1.05-1.1, depending on PWM
method)
P : Continuous motor capacity (kVA)
C 1
k
: Starting current/rated current of motor
S
n
: Number of motors in parallel
T
n
: Number of simultaneously started motors
S
2 : Total inertia (GD
GD
T : Load torque
L
t
: Motor acceleration time
A
N
: Motor speed
≤
the _ capacity _ of
ϕ
× × − ≤
3
V I 10 the _ capacity
M M
≤
the _ rated _ current
2
) calculated back to motor shaft (kg m
Chapter 12 Description of Parameter Settings|C2000 Series
_ AC _ motor _ drive ( kVA
_ of _ AC _ motor _ drive
_ of _ AC _ motor _ drive
2
)
17-3
)
( kVA )
( A )