Page 3
PPS Installation and Operating Manual
Rev. C.2 (January 19, 2018)
2.2 Alternator Contactor
The alternator contactor allows current to flow from the alternator(s)
to the main power bus. This allows one or more alternators to provide
power to the main power bus loads and battery charging if the main bus
contactor is closed.
For the contactor to be closed, the master switch (MASTER) must be
closed, the alternator (ALT DIST EN) must be enabled, and there must
not be an active fault.
The alternator contactor will latch open and indicate a fault (BATT DIST
FAULT) if the slow-trip current or the instantaneous maximum current of
400 amps is exceeded. The slow-trip current emulates the trip curve for a
standard 100 amp slow-blow fuse.
The alternator contactor fault may be reset by either toggling the
alternator (ALT DIST EN) or master switch (MASTER).
2.3 Main Starter Contactor
The main starter contactor allows current to flow from the main battery
to the starter.
For the contactor to be closed, the master switch (MASTER) must be
closed, the main starter (MAIN BATT START EN) must be enabled, and
there must not be an active fault.
The starter active indicator (STARTER ACTIVE) will be active when
there is voltage present at the starter output regardless of the main starter
contactor or auxiliary starter contactor being closed.
The main starter contactor will latch open if the slow-trip current, the
fast-trip current of 1200 amps or the instantaneous maximum current of
1500 amps is exceeded. The slow-trip current emulates the trip curve for
a standard 300 amp slow-blow fuse.
The main starter contactor fault may be reset by toggling the main starter
(MAIN BATT START EN) or master switch (MASTER).
2.4 Control / Status
2.4a Control Inputs
The inputs listed in the table below are inputs that control PPS operation
and are intended to be connected to switches. The switch may be a toggle
or momentary switch depending on the intended use. The switch should
make connection to GND for Open/GND inputs and make connection to
Bus voltage for BUS/Open inputs.
Name
Description
Type
Switch State
MASTER
Turn on PPS
Open/GND Closed = ON
Open = OFF
MASTER
ALTERNATE
Turn on PPS (Optional –
redundant to MASTER)
Open/GND Closed = ON
Open = OFF
BATT DIST EN
Closes the Main Battery
Distribution contactor
Open/GND Closed = ON
Open = OFF
ALT DIST EN
Closes the Alternator
Distribution contactor
Open/GND Closed = ON
Open = OFF
MAIN BATT
START EN
Closes the Main Battery
Start contactor
Bus/Open
Closed = ON
Open = OFF
PPS Control input pins
The electrical characteristics for Open/GND inputs are listed below.
Specification
Min
Max
Pin Voltage
0 V
36 V
Open Threshold
500 kΩ
–
GND Threshold
–
100 Ω
Open/GND Input Electrical Characteristics
The electrical characteristics for BUS/Open inputs are listed below.
Specification
Min
Max
Pin Voltage
0 V
36 V
High Threshold
7.8 V
–
Open Threshold
500 kΩ
–
BUS/Open Input Electrical Characteristics
