GE AF-650 GP Programming Manual page 7

Introduction
1 1
msb
Most significant bit.
MCM
Short for mille circular mil, an American measuring unit for
cable cross-section. 1 MCM=0.5067 mm
Online/offline parameters
Changes to online parameters are activated immediately
after the data value is changed. Press [OK] to activate
changes to off-line parameters.
Process PID
The PID control maintains the desired speed, pressure,
temperature, and so on, by adjusting the output frequency
to match the varying load.
PCD
Process control data.
Power cycle
Switch off the mains until display is dark – then turn
power on again.
Pulse input/incremental encoder
An external, digital pulse transmitter used for feeding back
information on motor speed. The encoder is used in
applications where great accuracy in speed control is
required.
RCD
Residual current device.
Set-up
Save parameter settings in 4 set-ups. Change between the
4 parameter set-ups and edit 1 set-up, while another set-
up is active.
SFAVM
Switching pattern called stator flux-oriented asynchronous
vector modulation (parameter F-37 Adv. Switching Pattern).
Slip compensation
The frequency converter compensates for the motor slip by
giving the frequency a supplement that follows the
measured motor load keeping the motor speed almost
constant.
STW
Status word.
Drive Standard Bus
Includes RS485 bus with the frequency converter protocol
or MC protocol. See parameter O-30 Protocol.
Thermistor
A temperature-dependent resistor placed on the frequency
converter or the motor.
Trip
A state entered in fault situations, for example if the
frequency converter is subject to an overtemperature or
when the frequency converter is protecting the motor,
process, or mechanism. The frequency converter prevents a
restart until the cause of the fault has disappeared. To
6
cancel the trip state, restart the frequency converter. Do
not use the trip state for personal safety.
Trip lock
The frequency converter enters this state in fault situations
2
to protect itself. The frequency converter requires physical
.
intervention, for example when there is a short circuit on
the output. A trip lock can only be canceled by discon-
necting mains, removing the cause of the fault, and
reconnecting the frequency converter. Restart is prevented
until the trip state is canceled by activating reset or,
sometimes, by being programmed to reset automatically.
Do not use the trip lock state for personal safety.
VT characteristics
Variable torque characteristics used for pumps and fans.
60° AVM
60° asynchronous vector modulation (parameter F-37 Adv.
Switching Pattern).
Power factor
The power factor is the relation between I
Power factor =
The power factor for 3-phase control:
Power factor =
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.
I
RMS
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.
02/2016 All rights reserved.
3 x U x I cosϕ
1
3 x U x I
RMS
I
I1 x cosϕ1
1
= since cosϕ1 = 1
I I
RMS RMS
2 2 2 2
= I + I + I + .. + I
1 5 7 n
and I .
1 RMS
for the
RMS
DET-618D