Parameter Set-Up
Group Title Function
0- Operation and Dis-
play
Parameters used to program the fundamental functions of the frequency
converter and the keypad including: 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 keypad keys/buttons; pass-
words for the keypad; upload and download of commissioned parameters
to/from the keypad and setting the built in clock.
1- Load / Motor Parameters used to configure the frequency converter for the specific appli-
cation and motor including: open or closed loop operation; type of applica-
tion such as compressor, fan or centrifual pump; motor nameplate data; au-
to-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/resis-
tor braking and over voltage control (which provides automatic adjustment
of the deceleration 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: al-
lowable motor direction; minimum 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 out-
puts, relay outputs, pulse inputs and pulse outputs for terminals on the con-
trol 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 Pur-
pose I/O option (MCB101) including: 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 elec-
trical noise on the analog signal which can sometimes occur when long ca-
bles 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 con-
trolled 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
11- LonWorks Parameters only applicable when a Lonworks option is installed.
Table 6. 2: Parameter Groups
How to program the Frequency Converter
BAS-SVX19C-EN 6-57
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