MicroGuard 414 Trouble Shooting Manual Hydraulic Cranes
MicroGuard 414 Trouble Shooting Manual Page 9 of 26 March 2, 2006
PRESSURE CHANNEL FAULT GUIDE
FUNCTIONAL TESTS
A fault in a pressure transducer is such that a fault on
one channel can cause an apparent fault in the other
channel. It is necessaryto test both channels and both
transducers together in order to determine which
transducer is at fault.
1. Access the calibration routine bysimultaneously
pressing and holding
SELECT(1) and TEST(2) keys
The displaywill request entryofthe calibration
securitycode.
2. The securitycode is entered bythe consecutive
pressing ofthe calibration arrowkeyswhich MUSTbe in
the following sequence:
Up, (3), Down (4),
Left (5), Right (6),
SELECT(1)
Ifthe wrong sequence is used or ifthe entryis not
completed within 5seconds then the calibration entrywill
be aborted and must be re-entered. After accessing the
calibration routine, the systemalarmwill sound as a
reminder that you are in the calibration routine.
3. Use the Up (3) or Down(4) Arrowkeysto scroll
to command 06 Zero. Press Select (1)
5. Press the LeftArrow(5) and then use the Up (3)
or Down(4) Arrowkeysto select TX0(pressure
transducer 0 piston side). Press Select (1).
6. With the boomin the rest or the boomhoist
cylinder fullyretracted relieve all pressure fromboth
transducers. With no pressure the upper displayshould
indicate 0+/-20 bits.
7. Press the LeftArrow(5) and then use the Up (3)
or Down(4) arrowkeysto select TX1 (pressure
transducer rod side). With no pressure in the cylinder the
upper displayshould read 0+/- 20 bits.
8. Ifthe transducers were disconnected in step 5
tighten the fittings. With the boomfullyretracted, boom
up to a 60 degree angle.
9. Access the Zero ofTX0as described in step 5,
the upper displayshould read 200+/-100 bits.
10. Access the Zero ofTX1as described in step 7,
the upper displayshould read 5+/-25 bits.
11. Boomdown. As the boomis moving down, the
displayed bits ofTX 1 should increase.
12. Place the retracted boomat a60 degree angle.
Access the Zero ofTX0as described in step 4, and
extend the boom.As the boomis extended the displayed
bits ofTX0should increase. When the boomis fully
extended the displayshould read 400+/-100 bits for a
three section boomand 600+/-100 bits for afour section
boom.
The values listed are nominal values. The actual values
will differ according to howthe machine is equipped. A
three section boomwill showasmaller value on TX0
under the sameconditions as afour section boom.
Additional equipment on the main boom,such as stowed
fly,auxiliaryhead sheaves and hookblockswill give a
higher value than the main boomalone. Ifanyvalue is
out ofrange, contact your distributor or factoryservice
department before replacing apressure transducer.
Refer to page xx ofthis manual for pressure transducer
replacement.
13. Exit the calibration routine bypressing the TEST
(2) key.
Ifthe foregoing functional tests indicate faults in the
pressure channels then proceed with Power Supply
Tests and the test ofthe resistance ofthe bridge ofthe
pressure transducers.
TEST
MicroGuard 414
INFORMATION
100%
OPERATOR ALARMS CONTRAST
VIEW SET CLEAR DOWN UP
CRANE
SET UP STOWED
DEDUCT WORKING
AREA
DEDUCT
ERECTED STOWED
SELECT
W
W
MAX
1
2
34
5 6
