2. Installation2.4 Connection terminals2.4.6 Connecting transistor outputsEASY-E4-DC-... devices feature transistor outputs.A separate power supply feed must be provided for the base device transistor outputs.Figure 18: Connecting base device transistor outputsTransistor outputs on easyE4 expansion devices are powered via the power supply forthe expansion device. In other words, transistor outputs have the same potential as theexpansion device's inputs.Figure 19: Connecting expansion device transistor outputsSuppressor circuit for transistor outputs on EASY-E4-... devices.Large currents may be produced when inductive loads are switched off. Because ofthis, transistor outputs should be protected with a suppressor circuit.Use a suppressor circuit and observe the following:Multiple inductive loads should not be switched off simultaneously, as this may result inthe electronic components overheating in the worst-case scenario. If the +24 VDCpower supply is switched off via a contact in the event of an emergency stop, and ifeasyE4 11/18 MN050009 EN www.eaton.com 55
