Winco DPG-2145-001 - Manual (Page 44)

Manual 36526F DPG-21XX-00X Digital Controllers
Woodward 36
Centralized Suppression
The control meets the regulatory requirements for its intended installations, and when
installed correctly as directed, the DPG input power can handle some level of surge
pulses.
Because the control power input is designed to be connected to a local bus and to have
inductive load kickbacks suppressed, it cannot withstand a charging system load dump,
heavy inductive kickbacks, or heavy surge pulses.
1. Charging system load dump is a pulse created when a heavily charging
battery that is being charged by an alternator or generator (or similar), is
disconnected from the bus.
2. Inductive kickbacks are due to series or parallel switched, unsuppressed,
inductive loads switched ON and OFF wired on the same power bus.
3. Large surge pulses are typically due to indirect lightning strikes. Some surge
pulses may also be present due to series inductances with switched currents.
The EMC environment into which the control is installed may have the above
conditions if the control is installed
OUTSIDE its intended usage. If the stated
conditions exist, centralized pulse suppression should be implemented to protect
the components on the bus, including the control.
Figure 2 is an example of centralized suppression that should be implemented at the
system level when any of the following are present:
1. The battery can be disconnected and an unsupressed high current
battery charging system is in use.
2. Unsuppressed, switched inductive loads are in parallel or series with the
control power.
3. The input power is derived from a distribution system or it is more than
32.8’ (10m) from the control to the main power source.