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Portable Ground Power Unit (GPU)
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| We also custom manufacture units in various combinations of batteries and power supplies to meet the customers exact requirements. |
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START
PAC MODEL 3328 USERS GUIDE
The Model 3328 is comprised of two basic parts, a power supply and a portable battery pack. The power supply is used to power up the aircrafts electrical system such as radios, GPS, lights, etc. when connected to an AC source and the switch is on. The battery pack is for starting. To get electrical power to the aircraft, the 10’ power cable must be plugged into the back of the Start Pac and then the other end plugged into the aircraft. First when electrical power (DC 28 volt power supplies) is needed on the aircraft, unplug the disconnect connector on the side of the Start Pac, this isolates the batteries and the power supply will provide all of the required power to the aircraft when the switch is turned on. This procedure saves the battery pack for starting. Second when starting power is needed to start the engine plug the disconnect connector in the side of the Start Pac and this will connect the battery pack for starting. The Start Pac does not need to be connected to the AC source for starting if so desired. Always recharge the battery pack as soon as possible by connecting to the AC source to the Start Pac and turning the switch on. The disconnect connector should be left plugged in when charging. All Start Pacs are designed to be user friendly and virtually require no maintenance. This model is comprised of two basically different units:1. When plugged into 220 single-phase AC power, the built in power supply will provide 105 amps continuous 28.5Volts DC current. 2. The second is full 28Volt, 52AH batteries. These batteries will provide superior-starting power for all electrically started aircraft. In addition, when AC power is not available, the batteries will give excellent check out time in a remote location. PLEASE NOTE: There is a manual battery disconnect that isolates the batteries from the power cable that goes to the aircraft. Since the batteries are at a higher potential (30.5Volts) versus the power supply (28.5Volts), if the disconnect is left plugged in, one would deplete the batteries about 50% until their voltage reached 28.5Volts. Therefore, when using the Start Pac with loads under 105 Amps, pull the disconnect to save the batteries for starting or other purposes. WARNING: Use disconnect jumper in the side receptacle only, never in rear receptacle. CAUTION: Always plug in the disconnect when starting, as the power supply alone will not meet starting loads. When charging depleted batteries, the power supply will quickly recharge the batteries to about 60% if the disconnect is plugged in. Then the topping charger, whether the disconnect is plugged in or not, will complete the charging process. CAUTION: Do not leave the Start Pac plugged into the aircraft with the battery disconnect in and leave unattended as the toping charger, to fully charge the batteries, cuts off at 34.5Volts. This high a voltage is not recommended. To maintain the batteries in the Start P ac, recharge as soon as possible after use. The built in chargers will fully recharge the batteries (in approximately 8 hours), then drop to a float mode to maintain the charge at 100%, but never overcharge. Try to avoid deep discharges as the batteries can go into a reversal state, which will make the unit unusable. TRY TO AVOID DEEP DISCHARGES. Model 3328 has a 250 amp maximum DC load. When charging this unit, the charge light will be yellow. As the unit reaches full charge, the light will become a steady green. NOTE-Please use #12 or larger AC Extension Cable |
START PAC
MODEL 3328 The Model 3328 yellow GPU is a combination power supply and battery pack.
The following dimensions apply to each of the 3300s: 38"x21"x20" Handle Height 48". Features-
The GPU is rated at 2800 peak starting amps. Continuous 105 or 175 amps
DC output when connected to a 220 Volt AC source. The GPU is a full 28.5-Volt
unit and will give faster, cooler starts on all turbine engines. The power
supply is large enough to power aircraft on board air conditioning systems
continuously. BATTERY DISCONNECT: When operating the continuous power supply at 105 or 175 amps and below, activate the battery disconnect. Since the 28.5 batteries actually read 30.5 Volts at rest, leaving the battery disconnect connected will deplete the batteries nearly 50% before their voltage reaches 28.5 Volts. Thus in this situation only one half of the battery capacity will be available for engine starting. By keeping the batteries separated from the continuous power supply, you will have full battery capacity for engine starts. If you need more than 105 or 175 continuous amps, then use the battery disconnect and the batteries will make up any amperage needed. NOTE- PLEASE USE #12 OR LARGER AC EXTENSION CABLE
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| Batteries
have no memory effect and can be recharged at anytime. Made in the USA. |
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