Parker IQAN-MC31 Instruction Book

26Digital outputsInstruction book, IQANDigital outputsThe digital outputs control relays and on/off valves.For the maximum load per output see Appendix A.Connecting loads to digital outputsConnecting of loads to the digital outputs such as on/off valves is done by using theDOUT positions and the negative battery terminal as ground.Protection against voltage transientsA clamping diode must be placed between the digital output and ground, as close to theload as possible. This protects the output against high voltage transients.For example, use diode: 1N5408 (3A/1000V).Depending on the load, other clamping diodes might be used instead.EXAMPLEConnect the on/off valve to the digital output using the DOUT-X, and the negativebattery terminal as ground.A clamping diode must be placed as close to the load as possibleConnecting a load to the digital output.N OTICEIf the load is controlled in parallel with another system, the digital output must beprotected with a diode.Digital output protected with a diode.d1DOUT-XIQAN moduleDOUT-X+BATd2d1IQAN module