Commissioning and maintenance made easy Testing unit for hydraulic valves Modern hydraulic hydraulic drives are more and more electronically controlled. This brings many benefits to their users : increased reliability, ease of control, integration of the hydraulic circuitry into the existing control system and easier diagnostic procedures. In real life however, the connection between electronics and mechanics can be a problem source, especially in the fields of commissioning and maintenance. Many plant managers will be familiar with the following scenario: when a complex part of a hydraulic drive system does not function according to specifications, the mechanic is called out. He performs a testing procedure at the end of which he states that the nature of the problem is electrical. Then the electrician is called out who will declare after a thorough examination of the problem that there is something wrong on the mechanical side. As a result, the system is at a standstill, precious production time is wasted and no quick cure of the problem is in sight. Or is there? PEES hytronic has developed a testing unit which will reduce the time wasted during commissioning and troubleshooting of proportional and servo valves. This unit will allow to set up a valve and its control circuitry and test the performance on site, under real operating conditions. The unit is inserted between the valve and the controller. The VT2001 will check the signals coming from the control unit and the valve's response to them. When switched to manual mode, a built-in potentiometer will allow to manually control the valve stroke. Two scales are available, so that minute changes in control signal can easily be simulated. But the VT2001 does not just allow to quickly adjust the valve control parameters during commissioning. In case of a malfunction it allows to quickly check whether all electric signals are present or if the valve itself is defective. When inserted in the circuit, the unit will display the value of all electric signals and power supply voltages present on the connector pins A to F. In manual mode, the built-in potentiometer will allow to vary the valve setpoint. In this way, the correct operation of the valve can be verified under normal operating conditions. This new testing unit is very user friendly, and can be operated without deep knowledge of hydraulic or electric circuitry. It can be used for checking and commissioning all types of proportional and servo valves using built-in electronics, a 7 pin normalized connector and supply voltages up to 24VDC. A data sheet is available on request.
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