Tronair JP30, Operation & Service Manual, Page: 12 / 83

Models: JP30, JP30L
Electric Towbarless Tug
07/2015 | Rev. 10 Page | 8
7.0 GROUND POWER UNIT (continued)
7.2 CONNECTION TO AIRCRAFT
1. Adapters are included with JETporter. Position JETporter so the power socket on the aircraft is in a location that will allow
the
engine to be started safely. Be sure the “Master” switch in the aircraft is off prior to starting the engines. Boost voltage
could damage the aircraft’s electrical system.
WARNING
Consult the owner/operator of the aircraft to confirm proper procedures for a GPU start.
2. Determine the voltage of the aircraft that is to be boosted. Attach the appropriate adapter to the end of the long boost
cables. Connect the black plug (negative) into the black socket in the front of the GPU panel. Always connect the GPU
cables to the tug first before making connection to the aircraft.
3. Connect the red plug into the appropriate red socket in the front of the GPU panel. Be sure that the voltage selected is
correct for the Aircraft that is being boosted. Again, make sure the connection is made to the tug prior to connecting
to the aircraft.
CAUTION
Do not allow aircraft to draw full power for more than one minute in ten minutes. Excessive use of the GPU
could cause severe heating and damage the batteries and/or GPU cables.
WARNING
Do not use the GPU system to run aircraft heating and cooling systems. The GPU system is not designed
to handle these continuous loads and can cause damage to the batteries and GPU cables. Under these
circumstances the batteries could produce explosive gases which, if ignited, may cause serious injury to
nearby personnel.
4. Once the aircraft engine has started, disconnect the GPU cable at the aircraft then from JETporter. Carefully wind the
GPU cables and stow them in one of the storage compartments on JETporter.
7.3
DETERMINING PROPER VOLTAGE
1. Check the aircraft ratings to determine the proper voltage, if unknown. DO NOT GUESS. Over-voltage can damage
aircraft electrical systems.
2. Do not unplug the GPU cables while the aircraft is being started. High currents can cause severe arcing.
8.0 BATTERY CARE
This section provides general instructions for good battery care. Please refer to Appendix in this section for additional
information on battery care.
8.1
WATER
1. Add approved water only to a fully charged battery. You can use local tap water as long as it is not high in mineral
deposits or other hard deposits.
2. Keep electrolyte water level above separator protectors.
3. Keep battery cells filled to proper level. Low water can cause permanent damage to batteries.
4. Check water level once a week. Replace water lost to evaporation. Never add water to a discharged battery.
5. Never add sulfuric acid to a battery.
6. Do not transfer acid from one cell to another.
7. Never allow the batteries to stand in an uncharged state. Plate damage will occur.
8.2
CHARGING
1. Keep battery compartment open during charging to ensure proper ventilation.
2. The batteries should be recharged when the state of charge indicator has declined to 30-40%.
For the Honeywell state of charge indicators, charge when the yellow LED lights are down to 3. This will be in the 30-40%
range. The last yellow LED will begin to flash when the charge drops below 25%.
For the Curtis state of charge indicators, charge when the LEDs in the yellow range are showing. This will be in the 30-
40% range. There are 3 LEDs in the yellow range. At 30% charge, there will be a flashing red LED. At 20% charge, there
will be a double flashing red LED.
Do not skim charge or constantly top up the batteries, as this will shorten the life considerably.
If the vehicle is not being used, batteries should be stored at full charge and topped up monthly.
3. Keep flame and metal away from the battery tops to prevent battery gasses from exploding.
4. Cool before charging or operating, if battery is above 115º F.
5. The Emergency Stop Switch
MUST
be in the “off” position during charging.