Danfoss VLT AQUA Drive Design Manual page 121

VLT ® AQUA Drive Design Guide
6.1.14. Start/Stop conditions
Commands assigned to digital inputs. See
Start (SYSTEM START /STOP) Ramps up (if stopped and
Lead Pump Start
Coast (EMERGENCY STOP)
Safety Interlock
Function of buttons on the Local Control Panel
Hand On
Off
Auto On
Digital Inputs
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 sent via terminals
or serial bus.
MG.20.N2.22 - VLT ® is a registered Danfoss trademark.
6. Application Examples
, par.5-1*.
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
De-staging (if running)
Cut out
Staging/De-staging
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