Atlas Copco MD 2500 W VSD, Instruction Book

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Instruction book
1 Worm gear housing
2 Worm gear motor
Fig. 2.16 Worm gear housing
1 EWD, inlet air water separator
2 Electric cable entry
3 Automatic condensate drain
4 Automatic condensate drain
5 Electric cable entry
6 EWD, regeneration air water separator
Fig. 2.17 Drain connections
1
2
3
4
5
6
51345F
3 OPERATING INSTRUCTIONS
3.1 Initial start-up (Fig 1.2)
It is assumed that the dryer and the parts delivered loose with it
are installed properly. An example of an installation of a dryer
with by-pass system is given in Figs. 1.1 and 2.14. Insulate the
regeneration air pipe properly.
1. On dryers equipped with a worm gear housing as shown in
Fig. 2.15, check that the worm gear housing of the dryer is
filled with oil to overflow level and remove the plug from
vent hole (2-Fig. 2.15).
2. Close the regeneration air inlet valve (7-Fig. 1.4), as well
as the air inlet and air outlet valves (10 and 11). Open the
by-pass valve (9).
3. Close the valves (1 and 2). Fill a transparent tube halfway
with water. Install the tube to valves (1 and 2).
4. Check that circuit breaker (F41 or Q2-Figs. 1.9 up to 1.15)
is in the "I" position.
5. On air-cooled dryers , check that circuit breaker (Q41-Figs.
1.9 up to 1.10) is in the "I" position.
6. Close the manual drain valve (8). Also close the manual
drain valve of the aftercooler drain trap of the compressor.
7. On water-cooled dryers , open the cooling water cocks (15
and 16-Fig. 1.4) of the regeneration air cooler. Also open
the main cooling water inlet valve (if provided).
8. On compressors with relay-controlled regulator, check
that toggle switch (S3) on the control and indicator panel
of the compressor is placed in the UNLOADed position.
9. Switch on the voltage at the mains. On compressors with
relay-controlled regulator, check that "MD-ON" indicator
lamp is alight.
On air-cooled compressors , start and stop the compressor
at the slightest rotation. Check for correct rotation
direction of the fan motor of the dryer. The correct
rotation direction is indicated on the fan housing. If the
rotation direction is wrong, switch off the voltage and
reverse two of the input line connections. Start and load
the compressor as per instructions given in the relevant
instruction book.
On MD1300 VSD and MD2500 VSD check the rotation
direction of the fan of the drive motor, the correct rotation
direction is indicated by an arrow. If the rotation direction
is wrong, switch off the voltage and reverse two of the input
line connections.
10. Slightly open the air inlet valve (11) to pressurize the dryer.
Fully open the valve after pressurizing.
11. Open the regeneration air inlet valve (7-Fig. 1.4) fully. Open
air outlet valve (10) and close by-pass valve (9).
12. Open the valve (if installed) to the air net or air receiver
and blow off some air from the air net to keep the compressor
running loaded.
13. Open valve (1) marked (-) of the U-tube. Slightly open
valve (2) marked (+), while watching the water levels in
the U-tube. Two conditions are possible:
- The water level in the leg marked (+) rises. Close valve
(2) at once, decrease the regeneration air inlet pressure
(see step 14). Do this as often as necessary, until the
water level drops.
- The water level in the leg marked (-) rises, which should
normally be the case. If the level in this leg rises 30 mm
above the level in the leg marked (+), close valve (2) at
once, as there is a risk that the water will be ejected
from the U-tube and disappear into the pressure vessel.
Increase the regeneration air inlet pressure (see step 14)
and open valve (2) again.