Danfoss VLT Series Design Manual page 9

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VLT HVAC Drive Design Guide 1. How to Read this Design Guide
Miscellaneous:
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Analog Inputs
The analog inputs are used for controlling various functions of the frequency converter.
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.
Brake Resistor
The brake resistor is a module capable of absorbing the brake power generated in regenerative
braking. This regenerative braking power increases the intermediate circuit voltage and a brake
chopper ensures that the power is transmitted to the brake resistor.
CT Characteristics
Constant torque characteristics used for screw and scroll refrigeration compressors.
Digital Inputs
The digital inputs can be used for controlling various functions of the frequency converter.
Digital Outputs
The drive 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 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.
GLCP:
Graphical Local Control Panel (LCP102)
Initialising
If initialising is carried out (par. 14-22), 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.
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MG.11.B2.02 - VLT is a registered Danfoss trademark