Danfoss VLT Design Manual page 9

How to Read this Design Gui...
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Digital Outputs
The frequency converter features two Solid State outputs
that can supply a 24 V DC (max. 40 mA) signal.
DSP
Digital Signal Processor.
Relay Outputs:
The frequency converter features two programmable Relay
Outputs.
ETR
Electronic Thermal Relay is a thermal load calculation
based on present load and time. Its purpose is to estimate
the motor temperature.
Initialising
If initialising is carried out (14-22 Operation Mode), the
programmable parameters of the frequency converter
return to their default settings.
Intermittent Duty Cycle
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 none-
periodic duty.
LCP
The Local Control Panel (LCP)keypad makes up a complete
interface for control and programming of the frequency
converter. The control panelkeypad is detachable and can
be installed up to 3 metres from the frequency converter,
i.e. in a front panel by means of the installation kit option.
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.
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VLT Refrigeration Drive Design Guide
On-line/Off-line Parameters
Changes to on-line parameters are activated immediately
after the data value is changed. Changes to off-line
parameters are not activated until you enter [OK] on the
LCP.
PID Controller
The PID controller maintains the desired speed, pressure,
temperature, etc. by adjusting the output frequency to
match the varying load.
RCD
Residual Current Device.
Set-up
You can save parameter settings 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
V ector M odulation (14-00 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.
Smart Logic Control (SLC)
The SLC is a sequence of user defined actions executed
when the associated user defined events are evaluated as
true by the SLC.
Thermistor:
A temperature-dependent resistor placed where the
temperature is to be monitored (frequency converter or
motor).
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Trip
.
A state entered in fault situations, e.g. if the frequency
converter is subject to an over-temperature or when the
frequency converter is protecting the motor, process or
mechanism. Restart is prevented until the cause of the
fault has disappeared and the trip state is cancelled by
activating reset or, in some cases, by being programmed
to reset automatically. Trip may not be used for personal
safety.
Trip Locked
A state entered in fault situations when the frequency
converter is protecting itself and requiring physical
intervention, e.g. if the frequency converter is subject to a
short circuit on the output. A locked trip can only be
cancelled by cutting off mains, removing the cause of the
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MG16G102 - VLT is a registered Danfoss trademark