Danfoss VLT HVAC Drive FC 102 Operating Instructions Manual

Also see for VLT HVAC Drive FC 102: Operating instructions Service guide Programming guide Installation guide Installation guide

Contents

Group Title Function20-** FC Closed Loop Parameters used to configure the closed loop PI(D) controller, which controls the speed of thepump, fan or compressor in closed-loop mode including:• Defining where each of the 3 possible feedback signals come from (for example, whichanalog input or the BMS HLI).• Conversion factor for each of the feedback signals. An example could be a pressure signalused for indication of flow in an AHU or converting from pressure to temperature in acompressor application).• Engineering unit for the reference and feedback (for example, Pa, kPa, m Wg, in Wg, bar,m3/s, m3/h, °C, °F, etc).• The function (for example, sum, difference, average, minimum or maximum) used tocalculate the resulting feedback for single-zone applications or the control philosophy formulti-zone applications.• Programming of the setpoints.• Manual tuning or auto-tuning of the PI(D) loop.21-** Extended Closed Loop Parameters used to configure the 3 extended closed loop PI(D) controllers. The controllers can,for example, be used to control external actuators (for example, chilled water valve to maintainsupply air temperature in a VAV system) including:• Engineering unit for the reference and feedback of each controller (for example, °C, °F).• Defining the range of the reference/setpoint for each controller.• Defining where each of the references/setpoints and feedback signals come from (forexample, which analog input or the BMS HLI).• Programming of the setpoint, and manual tuning or auto-tuning of each of the PI(D)controllers.22-** Application Functions Parameters used to monitor, protect and control pumps, fans and compressors, including:• No-flow detection and protection of pumps (including auto-setup of this function).• Dry-pump protection.• End-of-curve detection and protection of pumps.• Sleep mode (especially useful for cooling tower and booster pump sets).• Broken-belt detection (typically used for fan applications to detect no air flow instead ofusing a ∆p switch installed across the fan).• Short-cycle protection of compressors and pump flow compensation of setpoint (especiallyuseful for secondary chilled water pump applications where the ∆p sensor has been installedclose to the pump and not across the furthest most significant load(s) in the system.• Using this function can compensate for the sensor installation and help to realise themaximum energy savings).23-** Time Based Functions Time-based parameters including:• Parameters used to initiate daily or weekly actions based on the built-in real-time clock. Theactions could be change of setpoint for night set-back mode or start/stop of the pump/fan/compressor start/stop of an external equipment).• Preventive maintenance functions, which can be based on running or operating hour timeintervals or on specific dates and times.• Energy log (especially useful in retrofit applications or where information of the actualhistorical load (kW) on the pump/fan/compressor is of interest).• Trending (useful in retrofit or other applications where there is an interest to log operatingpower, current, frequency or speed of the pump/fan/compressor for analysis and a paybackcounter.24-** Application Functions 2 Parameters used to set up fire mode and/or to control a bypass contactor/starter if designedinto the system.How to Programme Operating Instructions72 Danfoss A/S © 08/2014 All rights reserved. MG11F50266