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2.7.2 Description (see Fig. 2.7)
Operation of the electric circuit In detail
Start button S1 position 1:
Line 2 on 12V contact K3 closed (30-87), lamp H2 is
on. K4 excites contact K4 (87-87a). Thermocontact
element S5 normally closed, K1 excites contact K1
(30-87).
Use of preheat:
Start button S1 position 1 press pushbutton S8,
energizes relay K5 and provides power to the
glowplug.
Start button S1 position 2:
Line 3 on 12V (override function) hourmeter P1, and
fuel solenoid Y1 is excited. Thermocontact engine S2
normally closed, oil pressure contact S3 open.
Start button S1 position 3:
Start relay K0 is excited and starter motor is running,
engine builds up oil pressure and oil pressure contact
S3 closes. K3 excited and contact K3 changes over to
(30-87). Relay K2 no longer excited, contact K2
opens, lamp H1 goes out. Alternator also commences
supplying voltage and K4 is no longer excited and
contact K4 changes over to (87-87a). Lamp H2 goes
out, one can release start button S1 and it returns to
position 1. Exciting the safety devices occurs no
longer across line 3 but across line 2 to line 4 and this
way to line 3.
Explanation of shutdowns:
Oil pressure contact S3 opens, K3 no longer excited.
K3 changes over (87a-87), engine cuts out because
fuel solenoid Y1 no longer excited and lamp H2 goes
on simultaneously.
Thermocontact S2 opens, K3 no longer excited. K3
changes over (87a-87), engine cuts out because fuel
solenoid Y1 no longer excited and lamp H2 goes on
simultaneously.
Thermocontact S5 opens, K1 no longer excited.
Contact K1 changes over (87-87a). K3 no longer
excited. K3 changes over (97a-87), engine cuts out
because fuel solenoid Y1 no longer excited and lamp
H2 and H1 go on simultaneously. Take-over relay K2
is excited simultaneously with H1 and contact K2
closes (30-87).
Thermocontact S5 cools off and closes, K1 excited
again and contact K1 changes over (87-87a
However, lamp H1 remains on across line 9 and
contact K2 (30-87).
A fault in the alternator part causes terminal D+ to go to 0V
and K4 to be excited. Contact K4 changes over to (87a-
87), engine cuts out because fuel solenoid Y1 no longer
excited and lamp H2 goes on simultaneously.
1310 3011 73
3
Operating Instructions
3.1 Parking, Towing And Lifting
Instructions
Safety Precautions
The operator is expected to apply all relevant safety
precautions, including those mentioned on the Inside of the
cover of this book.
Attention:
— Check and retighten the wheel nuts and drawbar bolts to
the specified torque. See section 7.
3.1.1 Drawbar Preparations for Towing (see
Atlas Copco XAS185 compressors may be supplied to a
customer with a folded drawbar (see Fig. 3.1A). The drawbar is
positioned in it's upright position for shipping purposes only.
When the compressor is received by the end customer, the
drawbar will need to be put into it's operating position. To do
this:
1)
With the weight of the compressor still on the drawbar, pull
the pin on the jacking device (prop or nose wheel) and
move it into the down postion. Be sure to re-insert the pin to
keep the jack locked in place.
2)
Use the jack to support the compressor in a level position
by turning the handle at the top of the jack.
3)
Using the appropriate tools, remove the shipping bracket
(see Fig. 3.1A, item 1) and fold the drawbar into it's down
position (see Fig. 3.1B). Disgard locknut.
Note: take the necessary precautions as to not pinch the
wire harness that runs through the drawbar during the
unfolding process. Pull the excess harness out through the
front of the drawbar.
4)
Reuse the shipping bracket bolt to secure the drawbar by
reinserting the bolt through both drawbar halves (item 2, 3).
Secure and tighten with the locknut supplied in the shipping
bag. Torque the nut and bolt to 130 ft-lbs (refer to section
7.2 Compressor/Engine specifications).
5)
Using a jack stand or by blocking, support the end of the
drawbar (see Fig. 3.1C). With the compressor properly
supported remove the prop or nose wheel and tighten the
pivot nut/bolt (item 7, 8). Torque the nut and bolt to 130 ft-
lbs (refer to section 7.2 Compressor/Engine specifications).
).
6)
Re-attach the prop to the drawbar in the down position and
install keeper pin. Jack the unit up with the prop to remove
the blocking.
7)
Using bolt, washers, and locknut (items 4,5,6) from shipping
bag, insert bolt through hole on top of drawbar as shown in
Fig 3.1B using washers and secure with locknut. Torque
nut and bolt to 130 ft-lbs.
8)
Discard any remaining hardware and the shipping bracket.
9)
Retorque the all drawbar attachment bolts to their specified
value after 5-10 hours of use.
Note: the pivoting feature of the drawbar is for shipping
purposes only. The drawbar is to remain in the down
Figs. 3.1A-C)
15
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