Manual
| System Manual
37
Separate Power Supplies
Sensors or actuators can be powered by a common power supply unit. However, it is preferable to use
separate power supplies in order to maximize the electromagnetic compatibility of the overall system.
Interference Suppression of Inductive Loads
The outputs of the devices described in this manual have an integrated protective circuit that provides
safety against high-energy interference voltages, such as those that occur when inductive consumers
are switched.
Varistor or bipolar suppressor diode
Fig. 13: Interference Suppression of Inductive Loads
A suppressor diode helps to quickly reduce the energy stored in the inductive load of a magnetic field.
However, it is recommended to use commercially available protection circuits for inductive loads, es-
pecially loads in the range of the maximum current-carrying capacity of a channel at switching fre-
quencies of > 1 Hz. These protection circuits can reduce the energy stored in the connected induct-
ances.
The high voltages that occur when inductive loads are shut down result in strong fields in the cables
with consequential faults in adjacent circuits or devices.
Murrelektronik offers a wide selection of interference suppression products for this
purpose.
Please refer to our catalogs or:
Inductive load
(e.g. solenoid valves)
