Pdm Function Overview - Polaris Ranger 500 2x4 2007 Service Manual

PDM Function Overview

Functional Description
The Polaris PDM integrates many electronic features designed
for Polaris RANGERs. These features include the rectifier /
regulator, battery protected output, accessory power output,
ignition relay output, fan relay controller, ECU relay output, fuel
pump drive, differential solenoid drive, hub safety interlock,
and a starter diode.
Rectifier / Regulator
The rectifier converts the 3-phase AC stator input from coils 1,
2, and 3 into DC voltage, which charges the battery and/or
supplies current to the PDM loads. The regulator monitors the
battery voltage and shuts off the rectifier when full--charge
exists on the battery. SCRs are used to connect and disconnect
the alternator from the battery to achieve regulation of the
battery voltage. The regulator shuts off current on the BAT+ pin
if the battery exceeds the over--voltage threshold. A high
voltage transient will cause the regulator to turn off for a short
period of time. If there truly is an open battery condition then the
regulator will remain off, as the minimum battery requirement
will not be met. The regulator will not turn on unless there exists
battery voltage in excess of the minimum battery voltage
requirement. Therefore, do not attempt to charge dead batteries
using the vehicle's charging system.
Battery Protected Output
The battery protected output provides a Solid State Circuit
Breaker (SSCB) output and enables most of the functions on the
PDM. The output must be routed only to the vehicle key/run
switch for proper power up sequence. Battery protection is
enabled when the key switch connects the battery protection
output to loads (must include RUN input). This causes the
micro-controller to power-up and energize battery protection.
When RUN input goes high, the micro-controller will remain
'ON' until RUN input goes low by disconnection of the battery
protection via the key switch. The battery protection output is
protected from overloads and short circuits. If this occurs, the
output turns off. Once tripped, the SSCBs can be reset by
removing the overload or cycling the key switch. The SSCB will
trip again if the issue causing the overload is not removed.
ECU Relay Output
The ECU RELAY is a smart high-side power switch. The ECU
RELAY output is enabled when the RUN input is activated and
EFI input is low. Once enabled, the output will remain enabled
until the EFI input goes high. If the maximum ECU output
current threshold is exceeded, the output current will be reduced
until the devise thermally shuts down. It will automatically turn
back on when it has cooled.
Ignition Relay Output
The IGNITION relay uses a smart high-side power switch. The
IGNITION relay output is enabled when the RUN input is
activated and disabled when it's removed. If the maximum
output current threshold is exceeded, the output current will be
reduced until the devise thermally shuts down.
automatically turn back on when it has cooled, based on thermal
recovery. Repeated cycles will cause the short-circuit limit to
turn off repeatedly until the overload has been removed.
Accessory Power
The ACCESSORY POWER switch uses a smart high-side
power switch. The output is enabled when the RUN input is
activated and disabled when it's removed. If the output current
exceeds the short-circuit limit, the output current will be
reduced until the devise thermally shuts down. It will
automatically turn back on when it has cooled, based on thermal
recovery. Repeated cycles will cause the short-circuit limit to
turn off repeatedly until the overload has been removed.
Fan Relay Controller
The FAN relay is a smart high-side power switch. The FAN
controller requires the RUN input to be active and then is
enabled by the FAN ON signal. The FAN output current is
monitored by the micro-controller. If the over-current limit is
exceeded for the amount of delay time programmed, the output
will shut off. If the maximum current limit is exceeded, the
current will shut off immediately. The micro-controller disables
the FAN output for a pre--programmed amount of time, then
resets the FAN switch. This will continue until the issue causing
the fault has been removed. When the FAN relay is off, the
micro-controller also monitors the output to see if the fan has
been disconnected.
Fuel Pump Relay
The fuel pump circuit provides a FUEL ENABLE smart high-
side power switch output. The FUEL_PUMP output is enabled
when RUN is activated and FUEL_ENABLE is low. If the
maximum output current threshold is exceeded, the output
current will be reduced until the device thermally shuts down. It
will automatically turn back on when it has cooled, based on
thermal recovery. Repeated cycles will cause the short-circuit
limit to turn off repeatedly until the overload has been removed.
ELECTRICAL
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