PN 115.04.7706 - INSTRUCTION MANUAL OF GPU JET-POWER DIESEL 90kVA - 115VAC, 400Hz / 28VDC, 2500A - PN 115.09.7701.
GPU JET-POWER DIESEL 90kVA – 115VAC, 400Hz / 28VDC, 2500A – PN 115.09.7090 14/40
If the rotation is right and the output voltage is incorrect adjust the potentiometer on the
panel. A good fit is to output 29,3VDC. When is set this pot changes the alternating voltage
supplied by the alternator. With output of 29.3 VDC, the generator voltage is 115V.
If you can not adjust the tension in the pot do the adjustment as described in section 6. If
you can not adjust it may be necessary to change the voltage regulator. Use a reliable
multimeter and check the tension of the two instruments. Due to Diesel engine vibration is
not a perfect fit for long. To adjust the tools, open the panel (remove the 2 screws) put the
probes in low terminals (2 above are for power 115VAC, 400Hz). Remove the outer cover
of the instrument, forcing out with a small screwdriver and adjust the "trimpot" internal
order to have the same reading of a good instrument. To adjust the output voltage, set the
voltage adjustment potentiometer on the panel in its central position. The voltage regulator
(bottom right) adjust the trimpot "Vad" to indicate 115VAC in digital voltmeter already
measured.
Please note: Digital Multimeters usually measure less in 400Hz (approx 108V correspond
to 115V in above 200V scales.).
G) 115VAC output with frequency above or below normal.
CAUSE: incorrect frequency adjustment (engine speed).
CHECK: The frequency depends directly on the engine speed.
If the engine speed is not normal, the frequency also is not. If is not normal, attempt to
adjust the "Digital Speed Control Unit ". Check adjustments as described in section 6.
If you cannot adjust, it may be necessary to change the filters of diesel oil or air filter.
Very dirty air filter, diesel oil supply problems in the injection pump or other engine defects
can cause the electronic circuit speed control cannot make the correct speed is reached.
With digital controller this setting does not exist in the panel and is done in software. It is
important not to change the number of teeth of the rack. The Iveco engine has 125 teeth.
H) 63A circuit breaker connected after disarming the device.
CAUSE: internal or external short circuit 28VDC output rectifiers or shorted.
CHECK: If the 28VDC output jack is normal. If it is, the more likely that one or more
rectifiers have entered into a short circuit. To test them do as indicated below:
1 - Open the unit cover giving access to the transformer.
2 - Measure the resistance between positive and negative (normal 8.2 ohm). If near zero
rectifier is short-circuited.
3 - Loosen the six terminals of the rectifiers.
4 - With a “multimeter”, test the rectifiers (one by one).
5 - Replace (s) that is (are) shorted.
6 - Use a ridge 24mm wrench to loosen the damaged diode.
7 - Use rectifiers Semikron SKR240 / 04 or other with thread 3/4 ", UNF.
8 - After exchange (s) tighten everything firmly, without exaggeration.
9 - Reset circuit breaker.
