Abbreviations, Symbols, And Conventions; Safety - Danfoss VLT AQUA Drive FC 202 Programming Manual

Introduction
VT characteristics
Variable torque characteristics used for pumps and fans.
+
VVC
If compared with standard voltage/frequency ratio control,
+
voltage vector control (VVC ) improves the dynamics and
the stability, both when the speed reference is changed
and in relation to the load torque.
60° AVM
60° asynchronous vector modulation
(parameter 14-00 Switching Pattern).
Power factor
The power factor is the relation between I
3 x U x I cosϕ
1
Power factor =
3 x U x I
RMS
The power factor for 3-phase control:
I1 x cosϕ1
Power factor = =
I
RMS
The power factor indicates to which extent the frequency
converter imposes a load on the mains supply.
The lower the power factor, the higher the I
same kW performance.
2 2 2
I = I + I + I + .. + I
RMS 1 5 7
In addition, a high power factor indicates that the different
harmonic currents are low.
The DC coils in the frequency converters produce a high
power factor, which minimizes the imposed load on the
mains supply.
Target position
The final target position specified by positioning
commands. The profile generator uses this position to
calculate the speed profile.
Commanded position
The actual position reference calculated by the profile
generator. The frequency converter uses the commanded
position as setpoint for position PI.
Actual position
The actual position from an encoder, or a value that the
motor control calculates in open loop. The frequency
converter uses the actual position as feedback for position
PI.
Position error
Position error is the difference between the actual position
and the commanded position. The position error is the
input for the position PI controller.
Position unit
The physical unit for position values.
MG20OB02
Programming Guide
and I .
1 RMS
I
1
since cosϕ1 = 1
I
RMS
for the
RMS
2
n
Danfoss A/S © 05/2018 All rights reserved.
1.7 Abbreviations, Symbols, and
Conventions
°C
Degrees Celsius
°F
Degrees Fahrenheit
AC Alternating current
AEO Automatic energy optimization
AWG American wire gauge
AMA Automatic motor adaptation
DC Direct current
EMC Electro magnetic compatibility
ETR Electronic thermal relay
f Nominal motor frequency
M,N
FC Frequency converter
I Rated inverter output current
INV
I Current limit
LIM
I Nominal motor current
M,N
I Maximum output current
VLT,MAX
Rated output current supplied by the
I
VLT,N
frequency converter
IP Ingress protection
LCP Local control panel
MCT Motion control tool
n Synchronous motor speed
s
P Nominal motor power
M,N
PELV Protective extra low voltage
PCB Printed circuit board
PM Motor Permanent magnet motor
PWM Pulse width modulation
RPM Revolutions per minute
Regen Regenerative terminals
T Torque limit
LIM
U Nominal motor voltage
M,N

1.8 Safety

WARNING
HIGH VOLTAGE
Frequency converters contain high voltage when
connected to AC mains input, DC supply, or load sharing.
Failure to perform installation, start-up, and maintenance
by qualified personnel can result in death or serious
injury.
•
Only qualified personnel must perform instal-
lation, start-up, and maintenance.
•
Before performing any service or repair work,
use an appropriate voltage measuring device to
make sure that there is no remaining voltage on
the frequency converter.
1 1
7