Hydraulic power unit control circuit
This diagram captures the electrical controls around a small hydraulic power unit. The fused 24 V control supply reaches a start button, a normally closed stop button, and the pump motor contactor. An auxiliary contact provides the seal-in path that keeps the contactor active after the operator releases Start. A pressure switch is shown separately with a low-pressure pilot lamp so the operator has a simple status indication. It is a useful starting point for documenting a hydraulic lift, press, or fixture power pack. Add the motor power circuit, overload relay, emergency stop, and the hydraulic fluid circuit as separate drawings where the machine requires them.
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Scenario
Starting and monitoring a hydraulic power unit.
Key decisions
- Start/stop station: Momentary start and normally closed stop commands control the contactor.
- Seal-in contact: The auxiliary contact keeps the motor contactor energized after start is released.
- Pressure indication: A pressure-switch input drives a visible low-pressure warning.
When to reuse this
Use for a basic power-pack control concept before adding overload protection, a motor starter, and plant safety interlocks.
Frequently asked questions
What is a hydraulic power unit?
What is a seal-in contact?
Why use a pressure switch?
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