•
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)
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 normal stop com-
mand) or stays in operation if already running
Destaging (if running)
Off
Ramps down
Cut out
Auto On
Starts and stops according to commands via ter-
minals or serial bus
Staging/Destaging
Automation VT Drive FC322 Design Guide
6 Application Examples
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