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The screw terminals accept wire sizes from 0. Hinged covers prevent hands or metal making accidental contact with live wires. The function of the connections varies depending on the type of module fitted in each position and this is shown below. Note: The order code and terminal number is pre-fixed by the module number x. Snubbers Snubbers are used to prolong the life of relay contacts and to reduce interference when switching inductive devices such as contactors or solenoid valves.
If the relay is used to switch a device with a high impedance input, no snubber is necessary. All relay modules are fitted internally with a snubber since these are generally required to switch inductive devices. However, snubbers pass 0. If this type of device is used it will be necessary to remove the snubber from the circuit. The snubber is removed from the relay module as follows:- 1. Unplug the controller from its sleeve 2. Remove the relay module 3. Use a screwdriver or similar tool to snap out the track.
The view shows the tracks in a Dual Relay Output module.
Eurotherm 3508 Engineering Handbook
3504/3508 Engineering Manual (HA027988 Iss 19)