Learning outcomes
- Explain the key principles of vsd process control and pid.
- Carry out a structured practical check or configuration task.
- Recognise common faults, risks and evidence needed for diagnosis.
Module 5 · Lesson 3
VSD process control and PID
Apply speed control, pressure/flow/level PID, sleep/wake and multi-pump strategies.
Before you begin
Process instrument, setpoint definition and safe test conditions.
Safety: Use site procedures, approved test equipment and competent supervision. Never bypass a protection or interlock without formal control.
Step-by-step learning
- Scale the process feedback correctly in engineering units.
- Set a conservative initial PID tuning and verify controller direction.
- Introduce small setpoint changes and observe stability and response time.
- Configure limits, sleep/wake, broken-sensor and fallback behaviour.
Ian's practical tips:
- Wrong controller direction drives the process away from setpoint—test it at low risk first.
- Fix noisy or badly ranged feedback before trying to tune the PID.
Fault-finding questions
- What should be happening, and what evidence proves it?
- Where is the last known correct signal, voltage, state or process condition?
- What changed immediately before the fault?
- Can the system be divided into smaller testable sections?
Practical activity
Create a one-page test record for this lesson. Include expected values, measured results, equipment used, risks controlled, defects found and the final proven condition.