Winco DPG-2145-001 - Manual (Page 45)

Manual 36526F DPG-21XX-00X Digital Controllers
Woodward 37
Optional
Local Bus (Large & Short Length)
Local Bus (Large & Short Length)
Battery
A
lt
e
rn
a
to
r
/
G
e
n
e
ra
to
r
/
A
C
t
o
D
C
C
h
a
rg
e
r
DPG Control
V47ZA7 MOV to
chassis at the control
(24V & 12V system,
WGC p/n 1688-411)
2
4
V
b
u
s
s
m
a
y
u
s
e
t
w
o
1
5
K
P
1
7
C
A
p
a
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(W
G
C
p
/n
1
6
8
2
-1
0
5
9
).
1
2
V
b
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s
s
m
a
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s
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t
w
o
1
5
K
P
1
3
C
A
p
a
rt
s
.
(W
G
C
p
/n
1
6
8
2
-1
0
6
1
).
In
d
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if
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r o
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Switched source
A
c
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Discrete parts are available from
Woodward as:
12V: 8923-1271.KIT
24V: 8923-1272.KIT
L
o
n
g
C
a
b
le
(
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L
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(
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)
Make/Brake contact may
cause Surge Pulses
Figure 5. Centralized Suppression Implemented at the System Level
FIGURE 5 NOTES:
1. Power and return cables to the control are routed together to minimize the
noise pickup and emissions. Similarly, the power and return to the
actuator must also be routed together, but may be separated from the
control’s power leads.
2. MOV and TVS suppression devices are recommended based on the
typical pulse levels that might be seen in Group 1 or Group 2 engine
applications and the internal circuitry of the control.
3. Other suppression devices may be used, but clamping voltages and energy
handling capability are important, as operating voltage and energy handling
capability requirements depend on the full system implementation.
Examples:
(a) Two 15KP17CA and V47ZA7 through-hole parts are available from
Woodward as 8923-1272.KIT. This kit is for a 24V system. It will
suppress alternator load dump from alternators within the 200A
range, as well as indirect lightning pulses that may be coupled to
the power bus. Parallel inductive loads still need to be suppressed
because pulses from unsuppressed parallel loads will be clamped
at voltages too high to protect the control.
(b) Two 15KP13CA and one V47ZA7 through-hole parts are
available from Woodward as 8923-1271.KIT. This kit is for a 12V
system with an alternator within the 100A range, unsuppressed
switched inductive loads in parallel with the control, and indirect
lightning pulses that may be coupled to the power bus.
4. Suppression kits available from Woodward are intended to suppress the
majority of the likely pulses. However, they will not protect against all
system level implementations outside the intended usage of the control. A
system level evaluation of what pulses may be present should be
undertaken.
Please see Application Note 51319 for more details.