Danfoss VLT HVAC Drive FC 102 Instruction Manual page 78

How to Program
Group Title
11-** LonWorks
13-** Smart Logic Controller
6 6
14-** Special Functions
15-** FC Information
16-** Data Readouts
18-** Info & Readouts
76
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VLT HVAC Drive FC 102
Function
Parameters only applicable when a LonWorks option is installed.
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 economizer 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 adjustable frequency drive 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 adjustable frequency drive including:
•
Setting of the switching frequency to reduce audible noise from the motor (sometimes
required for fan applications).
•
Kinetic backup function (especially useful for critical applications in semi-conductor instal-
lations where performance under line power dip/line power loss is important).
•
Line imbalance protection.
•
Automatic reset (to avoid the need for a manual reset of alarms).
•
Energy-optimization parameters. Normally, these parameters do not need changing. Fine-
tuning of this automatic function ensures that the adjustable frequency drive and motor
combination operate at their optimum efficiency.
•
Autoderating functions enabling the adjustable frequency drive to continue operation at
reduced performance under extreme operating conditions ensuring maximum up-time.
Parameters providing operating data and other adjustable frequency 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).
•
Adjustable frequency drive 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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