Danfoss VLT HVAC Basic Drive FC 101 Design Manual page 9

Introduction
Miscellaneous
Analog inputs
The analog inputs are used for controlling various
functions of the adjustable frequency drive.
There are two types of analog inputs:
Current input, 0–20 mA and 4–20 mA
Voltage input, 0–10 V DC.
Analog outputs
The analog outputs can supply a signal of 0–20 mA, 4–20
mA, or a digital signal.
Automatic Motor Adaptation, AMA
AMA algorithm determines the electrical parameters for
the connected motor at standstill.
Digital inputs
The digital inputs can be used for controlling various
functions of the adjustable frequency drive.
Digital outputs
The adjustable frequency drive features two solid state
outputs that can supply a 24 V DC (max. 40 mA) signal.
Relay outputs
The adjustable frequency drive 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.
Initializing
If initialization is carried out (14-22 Operation Mode), the
programmable parameters of the adjustable frequency
drive return to their default settings.
Initializing; 14-22 Operation Mode does not initialize
communication parameters.
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 non-
periodic duty.
Keypad
The keypad makes up a complete interface for control and
programming of the adjustable frequency drive. The
keypad is detachable and can be installed up to 10 ft [3 m]
from the adjustable frequency drive i.e., in a front panel
using 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
MG18C522
Design Guide
msb
Most significant bit.
Online/offline parameters
Changes to online 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 two set-ups can be saved. Change
between the four parameter set-ups and edit one set-up,
while another set-up is active.
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)
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 (adjustable frequency drive
or motor).
Trip
A state entered in fault situations, e.g., if the adjustable
frequency drive is subject to an overtemperature or when
the adjustable frequency drive 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. Trip may not be used
for personal safety.
Trip locked
A state entered in fault situations when the adjustable
frequency drive is protecting itself and requiring physical
intervention, for example, if the adjustable frequency drive
is subject to a short circuit on the output. A locked trip
can only be canceled by cutting off line power, removing
the cause of the fault, and reconnecting the adjustable
frequency drive. Restart is prevented until the trip state is
canceled by activating reset or, in some cases, by being
programmed to reset automatically. The trip-lock function
2
.
may not be used as a personal safety measure.
VT Characteristics
Variable torque characteristics used for pumps and fans.
Danfoss A/S © Rev. 2014-01-14 All rights reserved.
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