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OM-2029
NOTE: If the indicating light (17) should "go-out" as soon as the switch is released, and no fault lights
are ON, it indicates that 28.5-V DC holding current is not being supplied from the aircraft to the
plug-interlock relay. Correct the condition an again operate the load contactor control switch (18) as
above.
(4) It is recommended that the operator check output voltage and current in each of the three phases
early in the power delivery run. Use the meter switch (5) to select the phase. Use the line switch (6) to
select line-to-line or line-to-neutral voltage. If the load is changing, it is good operating practice to ob-
serve the instruments until load conditions stabilize.
(5) A condition of overvoltage, undervoltage, underfrequency, overfrequency, or overload in the out-
put circuit will automatically open the load contactor and turn on the applicable indicating light to sig-
nal the operator which of the above faults caused the protective monitor system to operate. After the
fault has been corrected, press the reset switch (3) to turn off the indicating light and reset the protec-
tive relay system. Proceed with power delivery by operating the load contactor switch.
No. 2 Output Circuit
The procedure for operation of the No. 2 output circuit is exactly the same as for No. 1 circuit, ex-
cept that the No. 2 contactor control switch (20) is used and the No. 2 contactor indicator light
(19) is observed. All other controls and procedures that were used for No. 1 output are used for
the No. 2 output.
F. Discontinue Power Delivery
(1) Place load contactor switches in OFF position. Green light (s) should go OFF immediately to indi-
cate that the load contactor has opened and power is no longer being delivered to the aircraft.
(2) Place engine-generator control switch (23) in IDLE position.
(3) Disconnect output cable from aircraft.
WARNING: HIGH VOLTAGE - ELECTRIC SHOCK OR FIRE CAN KILL! NEVER
DISCONNECT THE OUTPUT CABLE WHILE POWER IS BEING DELIVERED.
K. Stopping the Engine
(1) Allow the engine to idle a few minutes before stopping, to permit cooling.
(2) To stop the engine, move the START-RUN-STOP switch (22) to the STOP (down) position.
3. Transformer-Rectifier Operation
(Optional Equipment on Specifications 6906-3, 6906-4, 6906-5 and 6906-6)
Transformer-Rectifier operating instructions are contained in its operating manual, however some gener-
ator set instructions are required here.
A. Direct Current Power Delivery
NOTE: If the customer adds a Transformer-Rectifier to a standard machine which was NOT equipped
with a T-R when it left the factory, he must remove the jumper lead which will be found on the small
terminal strip in the generator set voltage regulator. If your generator set has a factory installed T-R, the
jumper will have been removed.
(1) When delivering power from a T-R, prepare the generator set for DC power delivery the same as
for AC delivery, except do not connect AC output cable and do not close AC load contactor.
(2) For T-R operating instructions, see Hobart Manual No. OM-433.
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July 27/90 Revised
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Table of Contents
Troubleshooting
