Danfoss VLT HVAC Basic Drive FC 101 Design Manual page 10

Introduction
1 1
Break-away torque
Torque
Illustration 1.1 Break-away Torque
η
VLT
The efficiency of the frequency converter is defined as the
ratio between the power output and the power input.
Start-disable command
A stop command belonging to the group 1 control
commands, see Table 1.3.
Stop command
See Table 1.3.
Analog reference
A signal transmitted to the analog inputs 53 or 54. It can
be voltage or current.
•
Current input: 0–20 mA and 4–20 mA
•
Voltage input: 0–10 V DC
Bus reference
A signal transmitted to the serial communication port (FC
port).
Preset reference
A defined preset reference to be set from -100% to +100%
of the reference range. Selection of 8 preset references via
the digital terminals.
Ref
MAX
Determines the relationship between the reference input at
100% full scale value (typically 10 V, 20 mA) and the
resulting reference. The maximum reference value set in
parameter 3-03 Maximum Reference.
Ref
MIN
Determines the relationship between the reference input at
0% value (typically 0 V, 0 mA, 4 mA) and the resulting
reference. The minimum reference value is set in
parameter 3-02 Minimum Reference.
Analog inputs
The analog inputs are used for controlling various
functions of the frequency converter.
There are 2 types of analog inputs:
8
®
VLT HVAC Basic Drive FC 101
Pull-out
rpm
Danfoss A/S © 04/2016 All rights reserved.
•
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
The AMA algorithm determines the electrical parameters
for the connected motor at standstill and compensates for
the resistance based on the length of the motor cable.
Digital inputs
The digital inputs can be used for controlling various
functions of the frequency converter.
Digital outputs
The frequency converter provides 2 solid-state outputs that
can supply a 24 V DC (maximum 40 mA) signal.
Relay outputs
The frequency converter provides 2 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 and prevent overheating of the motor.
Initializing
If initializing is carried out (parameter 14-22 Operation
Mode), the programmable parameters of the frequency
converter return to their default settings.
Parameter 14-22 Operation Mode does not initialize
communication parameters, fault log, or fire mode log.
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 on IP20 units
and fixed on IP54 units. It can be installed up to 3 m (9.8
ft) from the frequency converter, that is, in a front panel
with 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.
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.
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MG18C702