Danfoss VLT CDS 803 Manual page 74

VLT® Compressor Drive CDS 803
Design Guide
f
MIN
f
jog
I
I
M
I
M,N
Intermittent duty cycle
L
lsb
M
MCM
msb
N
n
M,N
O
Online/offline parameters
P
PI controller
P
M,N
Power factor
Preset reference
74 | Danfoss A/S © 2021.05
Minimum compressor frequency.
Motor frequency when the jog function is activated (via digital terminals).
Motor current (actual).
Rated motor current (nameplate data).
An intermittent duty rating refers to a sequence of duty cycles. Each cycle
consists of an on-load and an off-load period. The operation can be either
periodic duty or non-periodic duty.
Least significant bit.
Short for "mille circular mil", an American measuring unit for cable cross-
2
section. 1 MCM=0.5067 mm
Most significant bit.
Nominal motor speed (nameplate data).
Changes to online parameters are activated immediately after the data val-
ue is changed. Press [OK] to activate changes to off-line parameters.
The PI controller maintains the required speed, pressure, temperature, and
so on, by adjusting the output frequency to match the varying load.
Rated motor power (nameplate data in kW or hp).
The power factor is the relation between I
3 × U × I
1cosϕ
Power factor =
3 × U × I
The power factor for 3-phase control:
I × cosϕ1
1
Power factor = =
I
RMS
The power factor indicates to which extent the drive imposes a load on the
mains supply.
The lower the power factor, the higher the I
ance.
2 2 2
I = I + I + I + .. + I
RMS 1 5 7
In addition, a high-power factor indicates that the different harmonic cur-
rents are low.
The DC coils in the drive produce a high-power factor, which minimizes the
imposed load on the mains supply.
A defined preset reference to be set from -100% to +100% of the reference
range. Selection of 8 preset references via the digital terminals.
and I
1 RMS
RMS
I
1
since cosϕ1 = 1
I
RMS
for the same kW perform-
RMS
2
n
AJ330233902305en-000201/130R0596
Glossary