2005-2007 Polaris Ranger 500 service manual, Page 305Get this manual
ELECTRICAL Differential Solenoid The differential solenoid driver provides current-regulated low-side drive for the solenoid coilThe low side driver sinks current from the inductive load that is sourced internally via the ACCESSORY POWER outputTo activate the solenoid driver, the DIFF IN input and the BRAKE SWITCH must be highOnce enabled, the driver provides an initial "pull-in" current for pre-determined time and then lowers to "hold" current until the DIFF IN input or the BRAKE SWITCH goes lowThe positive side of the differential solenoid is current limited via ACCESSORY POWERThe solenoid driver provides shut down to shorts to batteryHub Coil Drive The hub safety interlock control (HSI) prevents the HUB COILoutput from activating if the stator coil input frequency is too highOnce the frequency is below the set limit, the HUB COILoutput is allowed to sink currentOnce the hub coil is activated it will remain engaged until current is removed from HUB COIL +Engine speed is measured via the stator coil input frequencyThis provides the coil with short circuit, overload and reverse polarity protectionAWD terminal is available for the high-side power input to the hub coilThe hub coil must be connected between the HUB COILand HUB COIL -The hub coil drive circuit provides no current limit or short circuit protection Reverse Polarity Protection The reverse polarity protection circuit is in series with the battery positive input of the PDMWhen the battery terminals are connected in reverse, the protection switch is forced off, interrupting any current flow other than bias current