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4 Helpful Features of Your Multifunction Control Box

The VMAC Multifunction power system (MF) control box does a lot more than turn your air compressor on and off. VMAC’s engineers programmed the control box to share important information with operators and crane controllers, and it therefore serves as the communication hub for your MF multi-power system.

Multifunction Control Box

In this article, we’ll talk about the 4 primary functions of your multifunction control box.

4. Change Default System Settings

Changing the factory default settings is one of the most useful yet unknown features of the MF control box. You can use your control box to change the system defaults to better suit your working conditions or environment.

The MF control box allows you to modify the following parameters:

  • System Pressure
  • Unload Delay
  • Standby Delay
  • Top-up Pressure
  • High Air Rate
  • Restart Pressure
  • Allow Cold Engine Restart
  • Disable Auto Engine Restart
  • Allow Low Battery Restart
  • Battery Restart Lower Threshold
  • Battery Restart Upper Threshold
  • Battery Restart Delay
  • Factory Reset

To access and modify the existing system parameters, enter the SYSTEM READY menu and then hold the BACK and NEXT buttons at the same time for five seconds. For more details on updating the system parameters, please see the Multifunction Owner’s Manual.

System Parameter Modification Chart

Operators can modify the following Multifunction system parameters:

SettingDescriptionDefaultAdjustment Options
Standby DelayDelay time to standby10 minutes1, 2, 5, 10, 15, 30 minutes, Never
Unload DelayDelay time to unload1 minute0.5, 1, 2, 3, 10, 15, 30 minutes, Never
System PressureOperating system pressure150 PSI150 PSI 80 to 150 PSI @ 5 PSI increments
Top-up PressurePSI below system pressure to allow inlet to open and build pressure5 PSI1 to 15 PSI @ 1 PSI increments
High Air Use RateAir rate set-point for pressure-based restart-3.0 PSI/sec0 to -30 PSI @ 0.5 PSI increments
Restart Pressure PSIAir pressure set-point for pressure-based restart120 PSI80 to 150 PSI @ 5 PSI increments
Disable Auto RestartDisable the engine from restarting in STANDBY after an adjustable
time.
Disabled
(feature is disabled; auto-restart is enabled)
Enabled or Disabled
Disable Auto Restart DelayTimer for disabling automatic engine restart30 minutesAlways, 30, 60, 90, 120 minutes, Never
Low Battery RestartIn Standby, allow the engine to restart based on low battery levelEnabledEnabled or Disabled
Battery Restart Lower ThresholdRestart point for battery voltage12.1V10.0 to 14.0V in 0.1V increments
Battery Restart Upper ThresholdFully-charged set point for battery voltage12.8V10.0 to 15.0V in 0.1V increments
Low Battery Restart DelayTime delay before going back to STANDBY after battery fully charged2 minutes2, 5, 10, 15, 20, 30 minutes
Cold Engine RestartAllow the engine to restart if temperature has dropped below
a preset value in STANBY.
EnabledEnabled or Disabled

3. Service/Maintenance Reminders

Your Multifunction multi-power system has been pre-programmed to remind you when it’s time for servicing and will also indicate the type of servicing that’s required.

For example, the MF display box will give you a 10-hour heads up when air compressor maintenance is due, such as the 500-hour and 1000-hour service. VMAC’s pre-packaged Multifunction service kits help make this service work as simple as possible.

Error CodeMessage DisplayedCause
29AIR FILTER PLUGGEDAir filter is not working, or working incorrectly
32BATTERY VOLTAGE TOO LOWThe battery voltage is below threshold for 5 seconds (see Section 7.7 for threshold adjustment).
46ENGINE RESTART DUE TO COLDThe engine has auto restarted due to the low internal temperature.
-500HR/6MTH SERV DUE IN xx HOURSThis warning will show up 10 hours before the 500 hour service internal.
54COMPRESSOR SERV 500HR / 6MTHThe system is due for a service. This warning will show after every 500 hours of running the compressor. Clearing the compressor service reminder is required through the Diagnostic menu.
-1000HR / 12MTH SER DUE IN xx HOURSThis warning will show up 10 hours before the 1000 hour service internal.
55COMPRESSOR SERV 1000HR/12MTHThe system is due for a service. This warning will show after every 1000 hours of running the compressor. Clearing the compressor service reminder is required through the Diagnostic menu.
-ENGINE SERVICE 50 HOURSEngine servicing required.
-ENGINE SERVICE 100 HRS/ENG. OIL100 hour engine servicing required.
-ENGINE SERVICE 200 HRS/ENG. OIL200 hour engine servicing required.
58ENGINE RESTART DUE TO LOW BATTEngine must restart due to low battery.

2. Service History Logs

Once you’ve completed your service, you can log this work in the control box. Your MF control box will remember the last 10 service logs, providing a clear record of when work was performed. You can use these records to confirm whether maintenance work was completed and keep your operators or yourself accountable.

1. Error Messages & Automatic Shutdown

After you turn on the Multifunction system, an automatic system check is performed to ensure the MF is in perfect working order. If any issues are encountered during this check, an error will be recorded in the ERRORS menu and the “WARNING” LED light will flash on and off to alert you. The controls will also automatically shut down the rest of the air compressor system to help protect the MF.

Error CodeMessage DisplayedCause
5COMP TEMP SENSOR FAILED – OPENTemperature sensor on the compressor is unplugged or wire to control box has been cut.
6COMP TEMP SENSOR FAILED – SHORTTemperature sensor on the compressor is shorted.
7COMP TOO COLD xx.x F/xx.x CCompressor is too cold to start. The temperature is displayed.
8COMP OVER TEMP xx.x F/xx.x CCompressor is too hot to start. The temperature is displayed.
9MANIFOLD TEMP FAILED – OPENTemperature sensor on the manifold is unplugged or wire to control box has been cut.
10MANIFOLD TEMP FAILED – SHORTTemperature sensor on the manifold is unplugged or wire to control box has been cut.
11MANIFOLD ERROR CHECK COALESCERTemperature sensor on the manifold is shorted.
12AIR PRESS SIGNAL VOLTAGE LOWLow voltage reading on the air pressure transducer.
13AIR PRESS SIGNAL VOLTAGE HIGHAir pressure is too high to start the engine.
14AIR PRESSURE xxx.x PSIIf the previous error is present the air pressure is displayed.
27UNEXPECTED ENGINE OPERATIONUnexpected engine operation can have many causes. It is likely due to RPM detected during an OFF state.
34ENGINE RPM NOT DETECTEDEngine RPM is not detected. Wire may be cut, tach sensor on bell-housing may be loose or fuel problem caused engine to stop suddenly.
35ENGINE CRANK TIME OUTThe engine did not start during the crank cycle.
36ENGINE OIL LOWOil level in the diesel engine is low.
37ENGINE TEMP PROBE OPENTemperature sensor on the diesel engine is unplugged or wire to control box has been cut.
38ENGINE TEMP PROBE SHORTTemperature sensor on the diesel engine is shorted.
39ENGINE TEMP TOO COLD TO STARTThe diesel engine is too cold to start.
40ENGINE OVER TEMPThe diesel engine is too hot to start.
41SERVICE PANEL OPENThe service panel is open. It must be closed before the unit is run.
42FUEL LEVEL LOW PLEASE RE-FILLFuel level for the diesel engine is low. It must be refilled before the unit is run.

For troubleshooting assistance with VMAC’s Multifunction multi-power system, please visit the VMAC Knowledge Base or call our technical support team at 1-888-241-2289.

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