CleaverBrooks ADAC 1000, Operation Manual

Page: 41 / 140

Chapter 3 — Commissioning
Part No. 750-386 3-19
3.13.3 - Pump Lead Lag with VFD
Only available on common header applications.
Allows for automatic start and stop of Lag pumps based on VFD
output%.
The Lead pump always runs.
Lag Start VFD% Speed
• If the VFD output% rises above the Lag Start VFD% Speed for the
Lag Start Delay Time the next Lag Pump will be commanded to
start.
Lag Stop VFD% Speed
• If VFD output% falls below the Lag Stop VFD% Speed for the Lag
Stop Delay Time the last Lag Pump will be commanded to stop.
Pump Lead Lag is automatically disabled if:
• Pump Auto Restart is Disabled and an Analog Low Water Cutoff
Alarm occurs.
• The number of pumps configured is changed.
• If the user enters an invalid Lead Lag order.
• 1 pump per boiler applications.
Lead Lag Start and Stop time delays:
With VFD Start = 0-300 sec
Stop = 0-900 sec
W/O VFD Start = 0-30 sec
Stop = 0-900 sec
3.13.4 - Pump Lead Lag with Contactor
Only available on common header applications.
Allows for automatic start and stop of Lag pumps based on Header
Pressure
The Lead pump always runs.
Lag Start Pressure
• If Header Pressure falls below Lag Start Pressure for the Lag Start
Delay Time the next Lag Pump will be commanded to start.
Lag Stop Pressure
• If Header Pressure rises above Lag Stop Pressure for the Lag Stop
Delay Time the last Lag Pump will be commanded to stop.
Pump Lead Lag is automatically disabled if:
• Pump Auto Restart is Disabled and an Analog Low Water Cutoff
Alarm occurs.
• The number of pumps configured is changed.