TECHNICAL MANUAL FOR THE RDR BL3 - V1.1 DRIVE ROLLER Rev. 21/09/2018 page 25
8.4 Protection from spikes on the direct current line
A spike is a rapid increase in voltage, more precisely a voltage increase of short or very short duration. The voltage
spike may be significantly (even several times) higher than nominal voltage.
The existence of this type of disturbance can be detected by a mains disturbance analyzer or an oscilloscope.
If electronic equipment is not protected against this type of disturbance, spikes can cause serious malfunctions
and/or permanent damage.
Typically, the spike is generated on the mains supply and VDC line following:
- connection or disconnection of large portions of power cable under a load
- start or stop of electric motors by remote switches or relays
- activation of inductive loads such as relay coils, remote switches, solenoid valves or voltage-carrying coils in
general.
These events create voltage spikes with relative current flow on the mains supply which can be reduced only by
specifically adapted devices (RC or other types of filter).
The fuses are unable to prevent these phenomena because the transient is too fast.
The only way to limit the value (and risk) of these spikes is to attenuate the phenomenon directly on the component
that generates it.
All manufacturers of devices featuring inductive technologies can provide spike filters that are specifically
designed and calibrated to suppress effectively the generation and spread of spikes and are fitted directly to the
component.
These filters can be connected parallel to the power supply clamps of the inductive components.
In order to extend the life of the Drive Rollers, use these filtering systems.
8.5 Electrical protection of the Drive Roller
The Drive Roller, if used without a RMC-BL3 board is supplied without a short circuit protection system
It is the customer's responsibility to provide a protection system for the main VDC power supply line (24 VDC) that
can protect the system following a possible short circuit of the line and the Drive Roller.
You are advised to fit serially one 5A instantaneous fuse to each Drive Roller.
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