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) makes up a complete
interface for control and programming of the frequency
converter. The control panel is detachable and can be
installed up to 3 m 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
2
.
msb
Most significant bit.
On-line/Off-line parameters
Changes to on-line parameters are activated immediately
after the data value is changed. Press [OK] to activate off-
line parameters.
PI controller
The PI controller maintains the desired speed, pressure,
temperature, etc. by adjusting the output frequency to
match the varying load.
RCD
Residual Current Device.
Set-up
Parameter settings in 2 set-ups can be saved. Change
between the 2 parameter set-ups and edit one set-up,
while another set-up is active.
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).
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, for example, 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 fault, and reconnecting the frequency converter.
Restart is prevented until the trip state is cancelled by
activating reset or, in some cases, by being programmed
to reset automatically. Trip locked may not be used for
personal safety.
VT characteristics
Variable torque characteristics used for pumps and fans.
VVC
plus
If compared with standard voltage/frequency ratio control,
Voltage Vector Control (VVC
plus
) improves the dynamics
and the stability, both when the speed reference is
changed and in relation to the load torque.
Introduction
VLT
®
HVAC Basic Drive FC 101 Programming Guide
6
MG18B302 - Rev. 2013-09-02
1
1
Summary of Contents for VLT HVAC Basic Drive FC 101
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