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VMAC Direct-Transmission™ Mounted Air Compressor & Multipower System Control Box Features

VMAC Direct-Transmission™ Mounted Air Compressor & Multipower System Control Box Features

The control box plays an important role in the Direct-Transmission™ Mounted air compressor and multipower systems (DTM), as it’s used to power the system and communicate with operators and service techs. In addition, the control box monitors the air compressor system on an ongoing basis to ensure its in proper working order.

The features of the DTM control box include:

  • Monitors compressor system temperature.
  • Monitors battery voltage.
  • Monitors the park brake signal.
  • Monitors the PTO solenoid current.
  • Monitors air temperature and automatically enables/disables the power inverter and the compressor heater as required.
  • Displays & logs 7 types of error messages.
  • Service reminders at 200 hours and 400 hours.

DTM Display Box Diagram

The display of the DTM control box looks like this:

DTM Display Box Diagram

DTM Display Box Diagram

DTM Information Messages

From time to time, the display box will share a message with the operator. These messages include service reminders, total hours operated, temperature issues, or problems with the park brake.

MessageDescriptionCompressor State
HRS:XXXX:XXMain screen hour meter.On/Off.
Park BrakePark brake is not applied or bad signalOff.
HRS:XXXX200HRSVC200HR service is needed.On/Off.
HRS:XXXX400HRSVC400HR service is needed.On/Off.
COMP TOO COLDCompressor too cold for operation.On.
TEMP XXXF/XXXCDisplays elevated temperature 130°C (266°F) to 150°C (300°F).On/Off.
Wait xx SecondsA 30 second delay to allow for compressed air blow down.Off.

DTM Display Box Error Codes

The DTM display box will also let operators know when errors occur that prevent the air compressor from operating properly. The following is a list of the errors that may display on the display box, as well as an explanation of what those errors typically mean.

Error CodeDisplayFaultPossible Problem
01OVER TEMPCompressor is too hot-Low compressor oil level.
-Faulty or crushed cooler hoses.
-Exceeded cooling capacity of the compressor cooling system.
-OEM changes in cooling.
-Non-standard application.
02TEMP PROBE SHORTCompressor temperature probe wires shorted or failed.-Faulty temperature probe.
-Crushed temperature probe wires.
-Pinched or bare wires that are grounded.
03TEMP PROBE OPENCompressor temperature probe disconnected or failed.-Disconnected temperature probe.
-Faulty temperature probe.
-Broken temperature probe wires.
04BATTERY LOWVehicle battery voltage detected is less than 11 V.-Faulty power wire connection.
-Bad fuse.
-Broken or poorly crimped electrical connectors.
-Vehicle charging system issues.
05SOLENOID HIGHCurrent draw on the solenoid is too high (4 A - 6 A).-Faulty PTO solenoid.
-Broken or pinched solenoid wire.
06SOLENOID LOWCurrent draw on the solenoid is too low (below 0.5 A).-Faulty PTO solenoid.
-Broken or pinched solenoid wire.
-Disconnected solenoid wire.
07SOLENOID SHORTCurrent draw on the solenoid is too high (above 6 A).-Faulty PTO solenoid.
-Solenoid wire shorted to ground or pinched.

For more help with VMAC’s Direct-Transmission™ Mounted air compressor and multipower systems, visit the VMAC Knowledge Base or call technical support at 1-888-241-2289.

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