[Pu29] Pump, modulating control VSD bypass
Program block, name / node subtype: [Pu29] Pump, modulating control VSD bypass
Library hierarchy: Universal equipment
Family: Pu
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Configurator
Program blocks are stored in the library without I/Os. Use the auto-create and auto-connect functions to create I/Os and/or to connect them to the interface blocks, e.g., R_A, CMD_B. Alternatively, take the I/Os from the folder containing the predefined I/Os in the library and/or from the plant and connect them to the interface blocks.
Controls a variable speed pump.
The program block "Variable speed control bypass" (VsdBy21) performs a control of the pump with constant speed in the event of a problem with the variable speed drive.
This program block has the following optional functions:
Option: Command (1xBO)
Enables the variable speed drive.
Some motor control units, e.g., some EC motors, only need an analog signal, e.g., 0-10 V, and do not need a binary output.
Option: Fault (1xBI)
Reads the fault signal from the pump control unit and generates an alarm.
Option: Feedback (1xBI)
Reads the feedback signal, e.g., from a pump control unit, and generates an alarm if feedback is missing when the pump must run.
Option: Feedback (1xBI)
Reads the feedback signal, e.g., from a pump control unit, and generates an alarm if feedback is missing when the pump must run.
A parameter in the program defines the source for the feedback (from the VSD or fan control unit or from an external source):
0 = Feedback from the VSD
1 = Feedback from external source
Option: Flow detector (1xBI)
Reads the signal from a flow detector and generates an alarm if flow is missing when the pump must run.
Option: Kick function
Prevents standstill damage by generating a pulse that starts the pump at a configured time with a defined pulse length after a minimum off time has elapsed.
This is configured in the program.
Option: Maintenance switch (1xBI)
Reads the signal from the maintenance switch and generates an alarm. If active, then the outputs of the pump are stopped with very high priority (priority 2).
Name | Description | Type | Alarm / Notification class | Trend / Type | |
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VsdBy | Variable speed control (VSD) bypass | N/A | N/A | ||
Spd | Speed | AO: Analog output | No | Yes, 2 | |
Name | Description | Type | Alarm / Notification class | Trend / Type | |
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Cmd | Command | BO: Binary output | No | Yes, 4 | |
Flt | Fault | BI: Binary input | Yes, 4/5 | No | |
MntnSwi | Maintenance switch | BI: Binary input | Yes, 5 | No | |
FlDet | Flow detector | BI: Binary input | Yes, 4 | No | |
Fb | Feedback | BI: Binary input | Yes, 4 | No | |
Description |
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Kick function |