6.1.14. Start/Stop conditions
Commands assigned to digital inputs. See
Digital Inputs
, par.5-1*.
Variable speed pump (lead)
Fixed speed pumps
Start (SYSTEM START /STOP) Ramps up (if stopped and
there is a demand)
Staging (if stopped and there
is a demand)
Lead Pump Start
Ramps up if SYSTEM START is
active
Not affected
Coast (EMERGENCY STOP)
Coast to stop
Cut out (built in relays are de-
energized)
Safety Interlock
Coast to stop
Cut out (built in relays are de-
energized)
Function of buttons on Local Control Panel
Variable speed pump (lead)
Fixed speed pumps
Hand On
Ramps up (if stopped by a nor-
mal stop command) or stays in
operation if already running
Destaging (if running)
Off
Ramps down
Ramps down
Auto On
Starts and stops according to
commands via terminals or se-
rial bus
Staging/Destaging
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®
HVAC Drive Design Guide
6. Application Examples
MG.11.B2.02 - VLT
®
is a registered Danfoss trademark
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