Danfoss VLT AutomationVTDrive FC322 Design Manual page 196

Automation VT Drive FC322 Design Guide
• Auxiliary break contact on K1 prevents K3 to cut in.
• RELAY 2 controls contactor K4 for on/off control of the fixed speed pump.
• At alternation both relays de-energizes and now RELAY 2 will be energized as the first relay.
6.1.13 Start/Stop Conditions
Commands assigned to digital inputs. See Digital Inputs , par.5-1*.
Variable speed pump (lead)
Start (SYSTEM START /STOP) Ramps up (if stopped and there is a demand)
Lead Pump Start Ramps up if SYSTEM START is active
Coast (EMERGENCY STOP) Coast to stop
Safety Interlock Coast to stop
Function of buttons on Local Control Panel
Variable speed pump (lead)
Hand On Ramps up (if stopped by a normal stop com-
mand) or stays in operation if already running
Off Ramps down
Auto On Starts and stops according to commands via ter-
minals or serial bus
MG.20.X1.22 - VLT
Remote Site Products - 1-888-532-2706 - www.remotesiteproducts.com
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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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is a registered Danfoss trademark
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