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500 Series Control System and Siren Amplifier
ENGSA5(xxxSx)Rev. D - 07/2021
RELAY OUTPUTS WITH INDUCTIVE LOADS
RELAY OUTPUTS WITH INDUCTIVE LOADS
Slide 1-3 or Relay 1-2
Outputs
Inductive Loads
Gunlocks, Fans, Solenoids,
Relays, Motors, Etc.
12vdc Output
User Installed
Diode
100v / 1a
Minimum
Relay 1-2 Outputs
Using a Ground Input
Inductive Loads
Gunlocks, Fans, Solenoids,
Relays, Motors, Etc.
Ground Output
User Installed
Diode
100v / 1a
Minimum
12vdc
Switched 12vdc Switched Ground
Inductive loads are a type of electrical load found in
devices that convert electrical current into a
magnetic field. In electronics, this covers just about
any device that utilizes a coil.
One of the characteristics of inductive loads is how
it stores energy from when it is switched on. This
energy store is often referred to as reactive power.
When the inductive load is shut down, this reactive
power is converted into stray voltage. Per the laws
of electricity, this stored energy must dissipate
when the load is switched off.
As a result of this characteristic, inductive loads can
cause transients or “spikes” at the moment of
shutdown.
To protect equipment against these spikes, we
strongly recommend installing a shunt diode as
shown on the diagrams to the left. The left diagram
shows how to wire the shunt diode in a positive
switched circuit, and the right diagram shows the
same for a ground switched circuit.
A shunt diode is nothing more than a standard diode
that allows the leftover voltage to dissipate. We
recommend a diode that is rated at least 100v at 1a.
In the emergency and utility vehicle industries,
inductive loads cover installing any of the following
devices (but are not limited to):
• Gun Locks
• Solenoids
• Relays
• Fans
• Motors
• Pumps
INDUCTIVE LOADS
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