VSD End of Curve Setup
The End of Curve Parameter settings for pump systems are used to detect leaks/breaks in the system which can cause damage if not detected and corrected promptly. End of Curve detection is based on the measurement of the feedback pressure and the speed of the motor. If there is a leak/break in the system, pressure will decrease and the pump will accelerate to try and increase the system pressure to the desired pressure. When the drive is running at maximum speed with a feedback signal less than a specified % (C0-25) of the set point pressure (expected pressure) for a specified time period (C0-26), a fault alarm is initiated (Err31).
This is used to detect low pressure at full speed or whether the PID signal is lost. Example:
- Set C0-25 = 97 %
- Set C0-26 = 15 sec
When it is detected that the PID feedback is less than 97% the expected feedback for time period exceeding 15 seconds, the VSD will stop and display fault alarm Err31.
For scenarios where this setup might be applicable, please see:
– To set up a EMHEATER VSD with a Pressure Transmitter to provide Constant Water Pressure using the VSD Parameters to set a Fixed Target Pressure, please see the relevant FAQ entry HERE.
– To set up a EMHEATER VSD with a Pressure Transmitter to provide Constant Water Pressure using an external analog signal (such as a PLC) to modify the target pressure (Variable Target Pressure), please see the relevant FAQ entry HERE.
– To set up a EMHEATER VSD with a Pressure Transmitter to provide Constant Water Pressure using an external Multi-Stage Switch to modify the target pressure (Target Pressure Selector), please see the relevant FAQ entry HERE.
– To set up a EMHEATER VSD with a Pressure Transmitter for Frequency Control using a PID (Manage Water Outflow), please see the relevant FAQ entry HERE.
– To set up a EMHEATER VSD with a Pressure Transmitter for Frequency Control using a PID (Manage Water Inflow), please see the relevant FAQ entry HERE.
– To set up a EMHEATER VSD with AI Input Overrun Limit (using a Pressure Transmitter as STOP), please see the relevant FAQ entry HERE.
For additional Protection Features, please also see:
– To set up a EMHEATER VSD Low Current Protection (Dry Run Protection), please see the relevant FAQ entry HERE.
– To set up a EMHEATER VSD Restart (Delayed) after Low Current Protection Condition Occurred (Dry Run Protection Reset), please see the relevant FAQ entry HERE.
