PmpSleep (FB)

FUNCTION_BLOCK PmpSleep EXTENDS AbbLConC3

The function block PmpSleep stops all pumps in the pressure control process during low demand. The function works only for pressure control (when function block PmpConfiguration has the input ProcessMode = 1 (Pressure control) with multi pump station or traditional pump station.
Key Features

  • The function block is used to conserve energy when the demand is very low and the pump is running at very less rpm.

  • For SleepMode = 1

    • Absolute difference between set and actual pressure must be less than sleep level. Sleep level is defined as percentage of set point e.g. sleep level 10 means 10 % of set value.

    • Master pump rpm must be less than SleepRpm.

    • If above both conditions are true for more than SleepDelay time then only pump gets ready to go to sleep.

    • Process increases set point by SleepBoostStep in terms of percentage for the time duration SleepBoostTime. This allows actual pressure to increase and in turn increases sleep duration.

    • Once SleepBoostTime is over, master pump goes in sleep and its ON command is removed.

    • When the actual pressure goes below WakeupLevel then the wake up function starts. It waits for WakeupDelay and then the ON command is issued to the master drive and the pressure distributor process takes over.

../../../../../../../_images/Sleep_Function.png

  • This figure shows the sleep and wake up sequence based on the change in the actual pressure with time.

Note

SleepMode = 2 has not been implemented yet in this version.

InOut:

Scope

Name

Type

Initial

Comment

Input

SleepMode

INT

0
2: The input SleepMode selects the sleep mode. Range-[1 to 2]

  • 0 = Disabled

  • 1 = Internal

  • 2 = External

PumpSetpoint

REAL

1.0

3: The input PumpSetpoint defines the pressure setpoint. The value is same as the input SetValue of the function block PmpPid. Range-Value>0.0

ActualValue

REAL

1.0

4: This Input represents the Actual pressure value. Range- Value>0.0

SleepLevel

REAL

5.0

5: The input Sleeplevel defines the sleep activation level, which is a percentage of the input PumpSetpoint. Range-[1.0 to 100.0]

PidOut

REAL

0.0

6: The input PidOut of the function block PmpSleep indicates the Pid output in percentage. The value is the same as the output PidOut of the function blocks PmpPid. Range- Value>=0.0

SleepRpm

REAL

100.0

7: Pump rpm below which pump should go into the sleep mode. Range-Value>0.0

SleepDelay

UINT

5000

8: The input SleepDelay defines the delay time in seconds at which the sleep function must be activated. Range-Value>0

SleepBoostTime

UINT

5000

9: Time in milliseconds for which sleep boost is to be operated. Range-Value>0

SleepBoostStep

REAL

5.0

10: The input SleepBoostStep defines the step limit in percentage at which the input PumpSetpoint must increase for the time duration defined in the input SleepBoostTime. Range- Value>=0.0

SleepExt

BOOL

FALSE
11: The input SleepExt enables sleep function externally, when input SleepMode = 2 (External).

  • When input is TRUE, sleep function is enabled externally.

  • When input is FALSE, sleep function is disabled or continues in the current mode.

WakeupMode

INT

1
12: Wakeup mode: Range-[1 to 2]

  • 1= Internal

  • 2= External

WakeupLevel

REAL

7.0

13: The input WakeupLevel defines the wake up activation level in percentage of the setpoint defined in the input PumpSetpoint. Range-Value>0.0

WakeupDelay

UINT

5000

14: Time delay in milliseconds for the wake up function to activate. Range- Value>0

WakeUpExternal

BOOL

FALSE

15: Digital signal or input to wake up the system when the WakeupMode = 2.

MasterPump

INT

1

16: The input MasterPump receives the identification number of the master pump in the sequence. The input comes from the output MasterPump of the function block PmpSequenceGen. Range-[1 to 8]

PmpStationParameters

PmpStationType

17: Pump Station structure which stores pumping station data. All function blocks will receive some data, process it and write it back to the structure.

Output

ErrorID

ERROR_ID

3: Error code in case of error in the function block execution.

SleepStatus

INT

0
4: The output SleepStatus of the function block PmpSleep indicates the sleep status of the pump. Range-[0 to 3]

  • 0 = Wakeup completed.

  • 1 = Boost Activated.

  • 2 = Sleep mode active.

  • 3 = Wakeup function active.

SleepBoostRef

REAL

0.0

5: The output SleepBoostRef of the function block PmpSleep indicates the sleep boost reference. This output is connected as input into PmpPid function block. Range- Value>=0.0

Methods:

A_StartAction

B_CyclicAction

C_CleaningAction

D_AbortAction

E_ResetAction

Structure: