Danfoss vlt FC 102 User Manual

6 How to Programme the Low Harmonic Drive
6.1 How to Programme the Frequency Converter
6.1.1 Parameter Set-Up
Group Title Function
0- Operation and Display Parameters used to program the fundamental functions of the frequency converter and the LCP includ-
ing: selection of language; selection of which variables are displayed at each position in the display (e.g.
static duct pressure or condenser water return temperature can be displayed with the setpoint in small
digits in the top row and feedback in large digits in the centre of the dispay); enabling/disabling of the
LCP keys/buttons; passwords for the LCP; upload and download of commissioned parameters to/from
the LCP and setting the built in clock.
1- Load / Motor Parameters used to configure the frequency converter for the specific application and motor including:
open or closed loop operation; type of application such as compressor, fan or centrifual pump; motor
nameplate data; auto-tuning of the drive to the motor for optimum performance; flying start (typically
used for fan applications) and motor thermal protection.
2- Brakes Parameters used to configure braking functions of the frequency converter which although not common
in many HVAC applications, can be useful on special fan applications. Parameters including: DC braking;
dymamic/resistor braking and over voltage control (which provides automatic adjustment of the decel-
eration rate (auto-ramping) to avoid tripping when decelerating large inertia fans)
3- Reference / Ramps Parameters used to program the minimum and maximum reference limits of speed (RPM/Hz) in open
loop or in actual units when operating in closed loop); digital/preset references; jog speed; definition of
the source of each reference (e.g. which analog input the reference signal is connected to); ramp up
and down times and digital potentiometer settings.
4- Limits / Warnings Parameters used to program limits and warnings of operation including: allowable motor direction; min-
imum and maximum motor speeds (e.g. in pump applications it is typical to program a minimum speed
to approx 30-40% to ensure pump seals are adequately lubricated at all times, avoid cavitation and
ensure adequate head is produced at all times to create flow); torque and current limits to protect the
pump, fan or compressor driven by the motor; warnings for low/high current, speed, reference, and
feedback; missing motor phase protection; speed bypass frequencies including semi-automatic setup of
these frequencies (e.g. to avoid resonance conditions on cooling tower and other fans).
5- Digital In / Out Parameters used to program the functions of all digital inputs, digital outputs, relay outputs, pulse inputs
and pulse outputs for terminals on the control card and all option cards.
6- Analog In / Out Parameters used to program the functions associated with all analog inputs and analog outputs for the
terminals on the control card and General Purpose I/O option (MCB101) (note: NOT Analog I/O option
MCB109, see parameter group 26-00) including: analog input live zero timeout function (which for ex-
ample can be used to command a cooling tower fan to operate at full speed if the condenser water return
sensor fails); scaling of the analog input signals (for example to match the analog input to the mA and
pressure range of a static duct pressure sensor); filter time constant to filter out electrical noise on the
analog signal which can sometimes occur when long cables are installed; function and scaling of the
analog outputs (for example to provide an analog output representing motor current or kW to an analog
input of a DDC controller) and to configure the analog outputs to be controlled by the BMS via a high
level interface (HLI) (e.g. to control a chilled water valve) including ability to define a default value of
these outputs in the event of the HLI failing.
8- Communication and Options Parameters used for configuring and monitoring functions associated with the serial communications /
high level interface to the frequency converter
9- Profibus Parameters only applicable when a Profibus option is installed.
10- CAN Fieldbus Parameters only applicable when a DeviceNet option is installed.
11- LonWorks Parameters only applicable when a Lonworks option is installed.
Table 6.1: Parameter Groups
VLT HVAC Low Harmonic Drive Operating In-
structions 6 How to Programme the Low Harmonic Drive
MG.16.A1.02 - VLT
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Danfoss vlt FC 102 Specifications

General

Brand	Danfoss
Model	vlt FC 102
Category	DC Drives
Language	English