Cummins/Onan — 8-2009

For these Cummins/Onan models: EGMBT (P4500), EGMBT/P4500, EGMBU (P5000e), EGMBU/P5000e.

Browse Cummins/Onan generators & specs →

Procedure

1. 3. Starting and Running the Generator Set 1The wattage values listed in this table are based on estimated wattage requirements. For exact wattage, check the data plate or the operator's manual for the item you wish to power. 2These units are usually hard-wired and require a professionally-installed transfer switch. NOTE: Ratings apply to altitudes up to 1000 feet (304.8 m), 85oF (30oC). Total power available will decrease 3.5% for each 1000 feet (304.8 m) above 1000 feet and 2.0% for each 10oF (5.5oC) increase in ambient temperature above 85oF (30oC).
2. 1. Make sure the tools and appliances to be connected are rated for the voltages at the generator set power output receptacles.
3. 2. Note the kW rating on the generator set nameplate.
4. 3. Check the power draw (watts) of each tool or appliance to be connected. Table 2 lists typical tool and appliance ratings in watts.
5. 4. Add the watt ratings of all the loads that the generator set will be powering at the same time. Make sure that total wattage will not exceed the generator kW rating. Example: A generator set rated 5 kW (5000 watts) can power two 1500 watt heaters, a
6. 900 watt circular saw, a 500 watt drill, and a 100 watt light at the same time (4500 watts altogether). However, to operate a second 900 watt saw, it will be necessary to disconnect one of the 1500 watt heaters. NOTE: A motor draws much more power when starting up than when running. It may be necessary to power fewer tools or appliances when motors and air conditioners are cycling on and off. CAUTION: Excessive power draw can overload the generator set. A motor draws much more power when starting up than when running. It may be necessary to power fewer tools or appliances when motors and air conditioners are cycling on and off.
7. 5. Connect the AC power cords to the appropriate receptacles on the control panel. See "Grounding."
8. 3.5.3 High Altitude Maximum power decreases roughly four percent every 1000 feet (310 meters) of increase in elevation above sea level. When operating the generator set at altitudes above 1000 feet, it may be necessary to power fewer loads at the same time.
9. 3.6 Charging Batteries To reduce arcing, always stop the generator set before connecting or disconnecting the battery to be charged. Connect the battery to be charged to the DC terminals on the control panel. Make sure polarity is correct: positive (+) to positive (+); negative (–) to negative (–). WARNING: Ignition of explosive battery gases can cause severe personal injury or death. Arcing at battery terminals can ignite battery gases. Ventilate the area before working on batteries. Wear safety glasses and do not smoke. Always stop the generator set before disconnecting the battery. Always disconnect the negative (–) cable first and reconnect it last. NOTE: The battery on electric-start models has its own charging circuit and therefore must not be connected to the DC charging terminals. 914-0116 (Issue 4) 19

Source: manual:914-0116 Cummins EGMBT&U Operators Manual (8-2009) .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.