Definitions - Danfoss VLT AutomationDrive FC 300 Design Manual

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1.1.3 Definitions

Frequency converter
Coast
The motor shaft is in free mode. No torque on motor.
I
MAX
The maximum output current.
I
N
The rated output current supplied by the frequency
converter.
U
MAX
The maximum output voltage.
Input
Control command
Start and stop the connected motor by means of LCP and
the digital inputs.
Functions are divided into two groups.
Functions in group 1 have higher priority than functions in
group 2.
Group 1
Group 2
Table 1.2 Function Priorities
Motor
f
JOG
The motor frequency when the jog function is activated
(via digital terminals).
f
M
Motor frequency. Output from the frequency converter.
Output frequency is related to the shaft speed on motor
depending on number of poles and slip frequency.
f
MAX
The maximum output frequency the frequency converter
applies on its output. The maximum output frequency limit
is set in 4-14 Motor Speed High Limit [Hz] (4-13 Motor Speed
High Limit [RPM]) and 4-19 Max Output Frequency.
f
MIN
The minimum motor frequency from frequency converter.
The minimum output frequency limit is set in 4-12 Motor
Speed Low Limit [Hz] (4-11 Motor Speed Low Limit [RPM]).
Default 0 Hz.
f
M,N
The rated motor frequency (nameplate data).
I
M
The motor current.
I
M,N
The rated motor current (nameplate data).
8
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®
VLT AutomationDrive FC 300 Design Guide, 0.25-75 kW
Reset, Coasting stop, Reset and Coasting
stop, Quick-stop, DC braking, Stop and
the "Off" key.
Start, Pulse start, Reversing, Start
reversing, Jog and Freeze output.
MG33BE02 - VLT
n
M,N
The rated motor speed (nameplate data).
n
s
Synchronous motor speed
2 × (par . 1 − 23) × 60
n s =
par . 1 − 39
P
M,N
The rated motor power (nameplate data).
T
M,N
The rated torque (motor).
U
M
The instantaneous motor voltage.
U
M,N
The rated motor voltage (nameplate data).
Break-away torque
Torque
Illustration 1.1 Break-away Torque
η
The efficiency of the frequency converter is defined as the
ratio between the power output and the power input.
Start-disable command
A stop command belonging to the group 1 control
commands - see this group.
Stop command
See Control commands.
®
is a registered Danfoss trademark
Pull-out
rpm