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Cummins/Onan — VOLTMETER COOLANT

For these Cummins/Onan models: VTA28-G2, VTA28-G3.

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Procedure

  1. 6 TEMPERATURE GAUGE AC AMMETER ~~ ~ DC VOLTMETER FREQUENCY PHASE SELECTOR ™ ADJUST wiTCH RUNNING TIME FREQUENCY METER METER EMERGENCY ya @an STOP PUSHBUTTON WATTMETER a oO OTHER L ES-1800-1 OIL TEMPERATURE TACHOMETER METERS AC PANEL DC PANEL FIGURE 7-1. CONTROL PANEL WITH OPTIONS 7-1 ENGINE GAUGES Check the following while the generator set is operating (see Figure 7-1): Oil Pressure Gauge The oil pressure gauge should be in the range of 40 to 70 psi (275 to 483 kPa) when the engine is at operating temperature. Water Temperature Gauge The water temperature should be in the range of 165° to 220°F (74° to 104°C) depending on the load and ambient temperature. Battery Gauge (DC Voltmeter) This is a voltage reference gauge, indicating condition of the batteries and also of battery charging circuit. Gauge should read approximately 24 to 28 volts while set is running. If reading is high or low, check batteries and the battery charger circuit. AC CHECKS Frequency Checks The generator frequency is a result of engine speed, which is automatically controlled. The generator fre- quency meter should be stable and the reading should be the same as the nameplate rating (50 or 60 Hz). See Figure 7-1. AC Ampere Check Turn the phase selector switch to each phase selection shown on the amperes scale. At no-load, the current reading should be zero. With a load applied, all three phases should be approximately the same, and no line current should exceed the set nameplate rating. Shut down the set immediately if the AWARNING AC output ammeter indicates current when all loads are supposed to be disconnected. Determine the cause and make necessary repairs or reconnections before placing the set in service. AC Voltage Check Turn the phase selector switch to each line-to-line phase selection shown on the volts scale (L1-L2, L2-L3, and L3-L1). Read the AC voltmeter (using the upper or lower voltage scale as indicated by the scale indicator light). At full-load, the line-to-line voltage should be the same as the set nameplate rating. Adjust the Voltage Adjust rheostat on the control panel as necessary to set voltage. 1-2. On generator sets without AC meters, use a remote voltmeter to verify generator set voltages. EXHAUST SYSTEM With the generator set operating, inspect the entire exhaust system including exhaust manifolds, mufflers, turbochargers and exhaust pipes. Visually and audibly check for leaks at all connections, welds, gaskets, and joints. Make sure exhaust pipes are not heating sur- rounding areas excessively. If any leaks are detected, have them corrected immediately. Inhalation of exhaust gases can | AWARNING result in severe personal injury or death. Inspect exhaust system audibly and visually for leaks daily. Shut the generator set down and have any leaks repaired immediately. FUEL SYSTEM With the generator set operating, inspect the fuel supply lines, filters, and fitting for leaks. Check any flexible sections for cuts, cracks and abrasions and make sure they are not rubbing against anything that could cause breakage. Leaking fuel will create a fire hazard | AWARNING | that can result in severe personal injury or death if ignited. If any leaks are detected, shut the generator set down and have any leaks repaired immediately. MECHANICAL CHECKS With the set running, listen for any unusual noises that may indicate mechanical problems and check the oil pressure frequently. Investigate anything that indicates possible mechanical problems. STOPPING Stop the generator set by moving the Run/Stop/Re- mote switch to STOP. Refer to Operation Section of the Operator’s manual to properly reset the controls for Manual, Remote, or Automatic starting. BREAK-IN PROCEDURE Make a special entry in unit log book to drain and replace the crankcase oil after the first 50 hours of operation on new generator sets. Use Running Time Meter (see Figure 7-1.) Refer to the Maintenance sec- tion of Operator's manual for maintenance schedule. Onon Onan Corporation
  2. 1400 73rd Avenue N. E.

Source: manual:960-0611 Onan DFGA DFGB DFGC Installation Manual (8-1990).pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.