Start/Stop Conditions - Danfoss VLT HVAC Drive FC 100 Series Design Manual

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VLT HVAC Drive Design Guide

6.1.13. Start/Stop conditions

Commands assigned to digital inputs. See
Start (SYSTEM START /STOP)
Lead Pump Start
Coast (EMERGENCY STOP)
Safety Interlock
Function of buttons on Local Control Panel:
Hand On
Off
Auto On
Digital Inputs , par.5-1*.
Variable speed pump (lead)
Ramps up (if stopped and there is a demand)
Ramps up if SYSTEM START is active
Coast to stop
Coast to stop
Variable speed pump (lead)
Ramps up (if stopped by a normal stop com-
mand) or stays in operation if already running
Ramps down
Starts and stops according to commands via ter-
minals or serial bus
MG.11.B7.02 - VLT ® is a registered Danfoss trademark
6. Application Examples
Fixed speed pumps
Staging (if stopped and there is a demand)
Not affected
Cut out (built in relays are de-energized)
Cut out (built in relays are de-energized)
Fixed speed pumps
Destaging (if running)
Ramps down
Staging/Destaging
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