Danfoss VLT Series Design Manual page 119

®
VLT HVAC Drive Design Guide
6.1.14. Start/Stop conditions
Commands assigned to digital inputs. See
Digital Inputs
Start (SYSTEM START /STOP) Ramps up (if stopped and
Lead Pump Start
Coast (EMERGENCY STOP)
Safety Interlock
Function of buttons on Local Control Panel
Hand On
Off
Auto On
, par.5-1*.
Variable speed pump (lead)
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 nor-
mal stop command) or stays in
operation if already running
Ramps down
Starts and stops according to
commands via terminals or se-
rial bus
®
MG.11.B2.02 - 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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