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Two Ways to Control a Pump
- Speed control: an electric drive changes the motor speed, so a fixed or variable pump delivers only the flow needed. When the machine idles, the motor slows or stops.
- Displacement control: the motor runs at a steady speed, while the pump’s swash plate or cam ring changes how much oil each turn delivers.
Both cut wasted energy and heat. Some systems combine the two for the best result.
Speed Control
Servo Drives and Controls
Servo drives power servo motors and close the loop on speed, pressure or position. On a servo pump, the drive reads a pressure sensor and adjusts the motor speed hundreds of times a second.
Variable Speed Drive Pumps
A variable speed drive (VSD) on a standard induction motor changes speed to follow demand. It’s a simple, lower-cost upgrade for machines with long idle periods or changing flow needs.
Servo Hydraulic Pumps
Servo hydraulic pumps combine a servo motor, drive and pump in one unit. They give fast, precise control of flow and pressure. They suit presses, injection moulding and test rigs, where the energy savings are biggest.
Displacement Control
Proportional Controlled Pumps
Proportional controlled pumps let an electrical signal set the displacement or pressure, often from the machine’s PLC. They give smooth, programmable control without a separate proportional valve for every function.
Load Sensing Pumps
A load sensing pump reads the pressure at the work port and delivers just enough flow and pressure to move the load, plus a small margin. They’re common on mobile machines, cranes and multi-function circuits.
Which Suits Your Machine?
- Long idle times, simple cycle: a VSD pump.
- Fast cycles needing high accuracy: a servo hydraulic pump.
- Several functions needing programmed flow: a proportional controlled pump.
- Mobile machines with changing loads: a load sensing pump.
If you’re not sure, a quick look at your pressure and flow over a full cycle usually makes the choice clear.
Where Smart Pump Control Pays Off
- Plastics and die casting: injection moulding and die casting machines with long hold and cooling times.
- Metal forming: presses that wait between strokes.
- Mining and mobile plant: cranes, drills and loaders with constantly changing loads.
- Test rigs and process lines: where steady, accurate pressure matters more than raw flow.
Retrofit or New Power Unit?
Many existing power units can take a VSD or servo pump while keeping the same tank, valves and pipework. Others are better replaced with a new unit designed around the new drive. Our energy efficiency and servo retrofit service can review your machine and size the right option before you spend.
What to Send Us
- The pump model code, and any control code on the regulator.
- The motor plate details, or the drive model if one is fitted.
- Pressures and flows over a typical cycle, even rough figures.
- How many hours a day the machine runs, and how much of that is idle.
Hydraulic Pump Controls Specifications to Check
- Control type: speed, displacement or both
- Pump displacement and maximum pressure
- Motor power, voltage and speed range
- Input signal: analog, fieldbus or hydraulic load signal
- Response time and accuracy needed
- Sensors and feedback required
Why Buy From TSA Hydraulics Engineering
As a hydraulic pump controls supplier, we look at how the machine runs, not just the part number, so the control saves energy instead of fighting the circuit. You get OEM or equivalent options, and help sourcing hydraulic pump controls replacement parts such as regulators, sensors, drives and control cards. We tell you upfront whether a part is genuine or an equivalent.