Danfoss VLT HVAC Drive FC 102 Design Manual page 14

How to Read this Design Gui...
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LCP
The local control panel (LCP) makes up a complete
interface for control and programming of the adjustable
frequency drive. The LCP is detachable and can be
installed up to 10 ft [3 m] from the adjustable frequency
drive, in a front panel with the installation kit option.
The LCP is available in two versions:
•
Numerical LCP101 (NLCP)
•
Graphical LCP102 (GLCP)
lsb
Least significant bit.
MCM
Short for mille circular mil, an American measuring unit for
cable cross-section. 1 MCM ≡ 0.5067 mm
msb
Most significant bit.
NLCP
Numerical local control panel LCP101.
Online/Offline Parameters
Changes to online parameters are activated immediately
after the data value is changed. Changes to offline
parameters are not activated until [OK] is entered on the
LCP.
PID Controller
The PID controller maintains the desired speed, pressure
and temperature by adjusting the output frequency to
match the varying load.
PCD
Process Data.
Pulse input/incremental encoder
An external digital sensor used for feedback information of
motor speed and direction. Encoders are used for high-
speed accuracy feedback and in high dynamic applications.
The encoder connection is either via terminal 32 or
encoder option MCB 102.
RCD
Residual Current Device. A device that disconnects a circuit
in case of an imbalance between an energized conductor
and ground. Also known as a ground fault circuit
interrupter (GFCI).
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Design Guide
Set-up
Parameter settings can be saved in four set-ups. Change
between the four parameter set-ups and edit one set-up,
while another set-up is active.
SFAVM
Switching pattern called Stator Flux oriented Asynchronous
Vector Modulation (14-00 Switching Pattern).
Slip Compensation
The adjustable frequency drive compensates for the motor
slip by giving the frequency a supplement that follows the
measured motor load, keeping the motor speed almost
constant.
Smart Logic Control (SLC)
2
.
The SLC is a sequence of user-defined actions executed
when the associated user-defined events are evaluated as
true by the SLC.
STW
Status word.
Thermistor:
A temperature-dependent resistor placed where the
temperature is monitored (adjustable frequency drive or
motor).
THD
Total Harmonic Distortion. A state of full harmonic
distortion.
Trip
A state entered in fault situations. For example, if the
adjustable frequency drive is subject to an overtem-
perature or when it is protecting the motor, process, or
mechanism. Restart is prevented until the cause of the
fault has disappeared and the trip state is canceled by
activating reset or, in some cases, by being programmed
to reset automatically. Do not use trip for personal safety.
Trip Locked
A state entered in fault situations when the adjustable
frequency drive is protecting itself and requires physical
intervention. For example, if the adjustable frequency drive
is subject to a short circuit on the output, it will enter trip
lock. A locked trip can only be canceled by cutting off line
power, removing the cause of the fault, and reconnecting
the adjustable frequency drive.
Danfoss A/S © Rev. 2014-01-13 All rights reserved. MG16C122