Danfoss VLT HVAC Drive FC 102 Operating Instructions Manual page 73

How to Programme
Group Title
13-** Smart Logic Controller
14-** Special Functions
15-** FC Information
16-** Data Readouts
18-** Info & Readouts
MG11F502
Operating Instructions
Function
Parameters used to configure the built-in smart logic controller (SLC). The SLC can be used for:
•
Simple functions such as:
•
Comparators (for example, if running above x Hz, activate output relay).
•
Timers (for example, when a start signal is applied, first activate output relay to
open supply air damper and wait x seconds before ramping up).
•
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. If the relative humidity 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 its 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.
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 instal-
lations 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. Normally, these parameters do not need changing. Fine-
tuning of this automatic function ensures that the frequency converter and motor
combination operate at their optimum efficiency.
•
Autoderating functions enabling the frequency converter to continue operation at reduced
performance under extreme operating conditions ensuring maximum up-time.
Parameters providing operating data and other frequency converter 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).
•
Frequency converter and option card identification parameters, such as code number and
software version.
Read-only parameters which display the status/value of many operating variables that can be
displayed on the LCP or viewed in this parameter group. These parameters can be useful during
commissioning when interfacing with a BMS via a high-level interface.
Read-only parameters which display useful information for commissioning when interfacing with
a BMS via a high-level interface. The information contains data such as:
•
The last 10 preventive maintenance log items.
•
Actions and time.
•
The value of analog inputs and outputs on the analog I/O option card.
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