PUMP_PROTECTION¶
Function Block PUMP_PROTECTION
| Available as of PLC runtime system | V1.3 and above |
| Included in library | PUMP_AC500_V23.lib |
| Type | Function Block without historical values. |
This Function Block contains two level protection for the inlet and outlet pressure monitoring. The actual pressure for the comparison is an analog input. In the first level primary protection, the drive indicates depending on the chosen mode: A warning, trips on a fault, or starts to follow a predefined reference. In the second level secondary protection, the drive either will stop or trip on a fault. For flow and the profile monitoring there is only one level of protection, in which the drive responds as per the control selected.
Example
If for the inlet the primary (first limit) protection for the low pressure is set, the INLET_CTRL mode is set to 3. Lower pressures than given in the limit are measured: The station will run in the reduced speed mode. In that case the PID output is frozen (in the PID). The current master gets the reduced speed INLET_FORCED_REF. This new ref speed of the master will decide whether to run followers or not.
Flow Monitoring
The control program has a monitoring function for flow that can be configured to generate an alarm or a fault whenever the flow falls below or rises above predefined limits. The flow can either be calculated or measured using a flow meter connected to, for example, an analog input.
Application Profile Monitoring
The application profile monitoring function can be used for long-term supervision of an actual signal. If the selected signal remains above the supervision limit for a specified time, an alarm will be generated.