Group Title Function
13- Smart Logic Controller 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 applica-
tions); kinetic back-up function (especially useful for critical applications in semi-conductor installa-
tions where performance under mains dip/mains loss is important); mains imbalance protection;
automatic reset (to avoid the need for a manual reset of Alarms); energy optimisation parameters
(which typically do not need changing but enable fine tuning of this automatic function (if necessa-
ry) ensuring the frequency converter and motor combination operate at their optimum efficiency at
full and partial load conditions) and auto-derating functions (which enable the frequency converter
to continue operation at reduced 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
indentification parameters such as code number and software version.
16- Data Readouts Read only parameters which display the status/value of many operating variables which can be
displayed on the LCP 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 partic-
ularly useful during commissioning 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 feedback 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 application); 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; programming of the
setpoint(s) and manual or auto-tuning of the PI(D) loop.
21- Extended Closed Loop Parameters used to configure the 3 extended closed loop PI(D) controllers which for example can
be used to control external actuators (e.g. chilled water valve to maintain supply air temperature in
a VAV system) including: engineering unit for the reference and feedback of each controller (e.g. °C,
°F etc); defining the range of the reference/setpoint for each controller; defining where each of the
references/setpoints and feedback signals come from (e.g. which analog input or the BMS HLI);
programming of the setpoint and manual or auto-tuning of the each of the PI(D) controllers.
How to Programme the Frequ...
VLT
®
HVAC Drive Operating Instructions
MG.11.AD.02 - VLT
®
is a registered Danfoss trademark 95
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