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Hydraulic Pump Control Unit – DAIKIN DHA00900
The DHA00900 is an electronic hydraulic pump control unit (“Hydraulic Pump Control Unit”) manufactured by DAIKIN Industries, industrial hydraulics division. This module forms the logical core of the hydraulic power unit fitted on CNC machine tools, machining centres and industrial systems that use DAIKIN hydraulic components for workpiece clamping, axis counterbalancing, automatic tool change and other hydraulic actuators. The unit integrates pump motor start/stop logic, operating pressure regulation, fault supervision (overtemperature, low oil, pressure anomaly) and the signal interface toward the CNC controller. No publicly documented variants or revisions are known; part number DHA00900 unambiguously identifies the component.
The control unit governs the entire hydraulic pump assembly: it starts the electric motor, brings the circuit up to operating pressure and continuously monitors oil level, temperature and pressure circuit integrity. In the event of a failure, the machine immediately loses its ability to generate the hydraulic pressure required for workpiece clamping, automatic tool change and vertical axis counterbalancing — the outcome is an immediate machine stop, with a concrete risk of losing the part being machined or causing mechanical damage to unbalanced axes.
DAIKIN Industries is a Japanese multinational founded in 1924, best known as a world leader in air conditioning and industrial ventilation. Its hydraulic division — DAIKIN Hydraulics — manufactures axial piston pumps, vane pumps, power units and electronic controls for industrial and machine tool applications, distributed worldwide with specialist technical support. Electronic modules of this generation are to be considered legacy / discontinued: availability is limited to the used market, industrial surplus stock and specialist repair services.
Main Technical Specifications
| Type | Hydraulic pump electronic control unit (Hydraulic Pump Control Unit) |
| Part number | DHA00900 |
| Brand | DAIKIN Industries – Hydraulics division |
| Known application | DAIKIN hydraulic power unit for CNC machine tools and machining centres |
| Function | Pump start/stop control, operating pressure regulation, fault supervision, CNC signal interface |
| Supply voltage | 24 V DC / 100–240 V AC |
| Inputs / outputs | Digital I/O for enable, fault, pressure-reached signals; outputs for valve control and motor contactor |
| Managed sensors | Pressure switch, oil thermostat, oil level sensor (typical for DAIKIN power units) |
| Interfaces / connectors | Screw terminal strip and multiple connectors |
| Weight | ~0.5–2.0 kg |
| Dimensions | ~150–300 mm |
| Production status | Legacy / discontinued — available as used stock, surplus or through specialist repair only |