Danfoss VLT HVAC Drive FC 102 Instruction Manual page 77

How to Program
Group Title
3-** Reference/Ramps
4-** Limits/Warnings
5-** Digital In/Out
6-** Analog In/Out
8-** Communication and
Options
9-** Profibus
10-** CAN Fieldbus
MG11F522
Instruction Manual
Function
Parameters used to program the following:
•
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 (for example, to which analog input is the
reference signal connected).
•
Ramp-up and ramp-down times.
•
Digital potentiometer settings.
Parameters used to program limits and warnings of operation including:
•
Allowable motor direction.
•
Minimum and maximum motor speeds. As an example, in pump applications the minimum
speed is often set to approximately 30–40%. This speed ensures that pump seals are always
adequately lubricated, avoid cavitation and ensure that adequate head is always produced 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 set-up of these frequencies (for example,
to avoid resonance conditions on cooling tower and other fans).
Parameters used to programme the functions of all
•
digital inputs
•
digital outputs
•
relay outputs
•
pulse inputs
•
pulse outputs
for terminals on the control card and all option cards.
Parameters used to program the functions associated with all analog inputs and analog outputs
for the control card terminals and general purpose I/O option (MCB 101). The parameters
include:
•
Analog input live zero timeout function (which, for example, 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 sometimes occurs
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).
•
Configuring the analog outputs to be controlled by the BMS via a high-level interface (HLI)
(for example to control a chilled water valve) including ability to define a default value of
these outputs in the event of the HLI failing.
Parameters used for configuring and monitoring functions associated with the serial communi-
cations/high-level interface to the adjustable frequency drive.
Parameters only applicable when a PROFIBUS option is installed.
Parameters only applicable when a DeviceNet option is installed.
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