1.5.1 System Status and OperationOnly when lead pump is working, the frequency convertercan go into sleep mode. When the Cascade Controller isenabled, the operation status for each pump and theCascade Controller is displayed by 25-81, Pump Status and25-80, Cascade Status on the LCP. Cascade Controllerinformation displayed includes:• Pumps Status, is a read out of the status for therelays assigned to each pump. The display showspumps that are disabled, off, running on thefrequency converter or running on the mains/motor starter.• Cascade Status, is a read out of the status for theCascade Controller. The display shows theCascade Controller is disabled, all pumps arerunning off, fixed speed pumps are beingstaged/de-staged and lead pump alternation isoccurring.1.5.2 Start/Stop ConditionsSee 5-1* Digital Inputs.Digital input commands Variable speed pump (lead) Fixed speed pumps (lag)Start (SYSTEM START/STOP) Ramps up (if stopped and there is ademand)Staging (if stopped and there is a demand)Lead Pump Start Ramps up if SYSTEM START is active Not affectedCoast (EMERGENCY STOP) Coast to stop Cut out (correspond relays, terminal 27/29and 42/45)External Interlock Coast to stop Cut out (built-in relays are de-energized)Table 1.20 Commands Assigned to Digital InputsLCP keys Variable speed pump (lead) Fixed speed pumps (lag)[Hand On] Ramps up (if stopped by a normal stopcommand) or stays in operation if alreadyrunningDestaging (if running)[Off] Ramps down Destaging[Auto On] Starts and stops according to commands viaterminals or serial bus cascade controlleronly can work when drive in "Auto ON"modeStaging/DestagingTable 1.21 Function of Keys on LCPQuick Guide VLT® HVAC Basic Drive Cascade Controller Quick Guide22 MG18F402 - VLT® is a registered Danfoss trademark11