Danfoss VLT AQUA Drive Design Manual page 141

®
VLT AQUA 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 de-
mand)
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
command) or stays in operation if already
running
Ramps down
Starts and stops according to commands
via terminals or serial bus
®
MG.20.N4.02 - 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)
Cut out
Staging/Destaging
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