Group Title Function
13- Smart Logic Control-
ler
Parameters used to configure the built in Smart Logic Controller (SLC) which
can be used for simple functions such as comparators (e.g. if running above
xHz, activate output relay), timers (e.g. when a start signal is applied, first
activate output relay to open supply air damper and wait x seconds before
ramping up) or a more complex sequence of user defined actions executed
by the SLC when the associated user defined event is evaluated as TRUE by
the SLC. (For example, initiate an economiser mode in a simple AHU cooling
application control scheme where there is no BMS. For such an application
the SLC can monitor the outside air relative humidity and if it is below a
defined value, the supply air temperature setpoint could be automatically
increased. With the frequency converter monitoring the outside air relative
humidity and supply air temperature via it’s analog inputs and controlling
the chilled water valve via one of the extended PI(D) loops and an analog
output, it would then modulate that valve to maintain a higher supply air
temperature). The SLC can often replace the need for other external control
equipment.
14- Special Functions Parameters used to configure special functions of the frequency converter
including: setting of the switching frequency to reduce audible noise from
the motor (sometimes required for fan applications); kinetic back-up function
(especially useful for critical applications in semi-conductor installations
where performance under mains dip/mains loss is important); mains imbal-
ance protection; automatic reset (to avoid the need for a manual reset of
Alarms); energy optimization parameters (which typically do not need
changing but enable fine tuning of this automatic function (if necessary) en-
suring the frequency converter and motor combination operate at their op-
timum efficiency at full and partial load conditions) and auto-derating func-
tions (which enable the frequency converter to continue operation at re-
duced performance under extreme operating conditions ensuring maximum
up time).
15- FC Information Parameters providing operating data and other drive information including:
operating and running hour counters; kWh counter; resetting of the running
and kWh counters; alarm/fault log (where the past 10 alarms are logged
along with any associated value and time) and drive and option card inden-
tification parameters such as code number and software version.
16- Data Readouts Read only parameters which display the status/value of many operating var-
iables which can be displayed on the keypad or viewed in this parameter
group. These parameters can be particularly useful during commissioning
when interfacing with a BMS via a high level interface.
18- Info & Readouts Read only parameters which display the last 10 prevantative maintenance
log items, actions and time and the value of analog inputs and outputs on
the Analog I/O option card which can be particularly useful during commis-
sioning when interfacing with a BMS via a high level interface.
20- FC Closed Loop Parameters used to configure the closed loop PI(D) controller which controls
the speed of the pump, fan or compressor in closed loop mode including:
defining where each of the 3 possible feedback signals come from (e.g.
which analog input or the BMS HLI); conversion factor for each of the feed-
back signals (e.g. where a pressure signal is used for indication of flow in an
AHU or converting from pressure to temperature in a compressor applica-
tion); engineering unit for the reference and feedback (e.g. Pa, kPa, m Wg,
in Wg, bar, m3/s, m3/h, °C, °F etc); the function (e.g. sum, difference, average,
minimum or maximum) used to calculate the resulting feedback for single
zone applications or the control philosophy for multi-zone applications; pro-
gramming of the setpoint(s) and manual or auto-tuning of the PI(D) loop.
Table 6. 3: Parameter Groups
How to program the Frequency Converter
6-58 BAS-SVX19C-EN
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