Starting; During Operation; Checking The Display; Manual Unloading/Loading - Atlas Copco GR110 Instruction Book

3.3 Starting

1. Press start button (8-Fig. 3.5). The compressor starts
running in unloaded condition. Automatic operation LED
(1) lights up.
Important
- If the oil injection pressure at the compressor elements is
too high during starting, the compressor will not start. See
section 1.3.1.5.
- In automatic operation, the regulator limits the number of
motor starts. Wait 20 minutes in case of manual restarting.
2. Approx. 10 seconds later (programmable), the compressor
starts running loaded. The message on display (4) changes
from <<Automatically unloaded>> to <<Automatically
loaded>>.
On GR W also:
3. Regulate the cooling water flow (using valve 4-Fig. 3.7)
with the compressor running loaded. Adjust the water
flow to obtain the most suitable air temperature at the outlet
of the compressor elements, i.e. between 2 and approx. 7°C
above the relevant temperature in Fig. 3.6.
Attention
- For optimum operation, the cooling water outlet temperature
must never exceed the value specified in section 7.5.
- Consult Atlas Copco if condensate should be formed during
frequent unloading periods.

3.4 During operation

1. When automatic operation LED (1-Fig. 3.5) is alight,
starting and stopping of the motor is controlled
automatically.
2. Check the readings on display (4-Fig. 3.5). See section
3.5.
3. To unload the compressor manually, press key <<Unload>>
(5-Fig. 3.5) 5). To put the compressor back into automatic
operation, press key <<Load>> (5) 5).
4. For GR Full-feature provided with an OSD oil/water
separator: regularly check that the vessel is filled; if
necessary, gently top up with water to the level of the water
outlet and re-install the cover.
Important
- If the compressor is stopped, it may start automatically. See
also section 1.3.1.
- The regulator will only react to a new control mode if the
new position of key (S5-Fig. 3.5) is maintained for 3
seconds.
- To avoid unauthorized switching over to another control
mode, take out key (S5) after selecting the required mode.
See also section 3.1.5.
26
3.5 Checking the display (4-.ig. 3.5)
1. Regularly check the display for readings and messages.
Normally, the main display (Fig. 1.7) is shown, indicating
the compressor outlet pressure, the interstage pressure, the
status of the compressor and the functions of the keys below
the display.
2. Always check the display and remedy the trouble if alarm
LED (3) is alight or blinks. See section 1.3. Also consult
the "User manual for Elektronikon regulator", section
"Submenu STATUS DATA".
3. The display will show a service message if one of the
monitored components is to be serviced; replace the
component, change the oil or grease the drive motor as the
case may be. Reset the relevant timer. Consult the "User
manual for Elektronikon regulator", "Submenu SERVICE".
Warning Before carrying out any maintenance, repair or
adjustment, stop the compressor, press emergency
stop button (S2-Fig. 3.5) and switch off the
voltage. Close the air outlet valve and open the
manual condensate drain valve(s). 6)
4. Regularly press key <<Show More>> (5-Fig. 3.5) 7) to call
up information about the actual compressor condition
including the temperatures and pressures, the status of
controlling the compressor (automatic or manual, local or
remote) and the status of the compressor start/stop timer
(active or not active) 8).
3.6 Manual unloading/loading (.ig. 3.5) 5)
Normally, the compressor runs in automatic operation, i.e. the
electronic regulator loads, unloads, stops and restarts the
compressor automatically. LED (1) is then alight.
Manually unloading
Press key <<Unload>> (5). LED (1) goes out. The message
<<Manually Unloaded>> appears on the display. The
compressor remains running unloaded unless it is loaded again
manually.
Manually loading
Press key <<Load>> (5). LED (1) lights up. The command
<<Load>> does not force the compressor in loaded condition,
but it will switch the compressor to automatic operation again:
the compressor will be loaded if the air net pressure drops below
the programmed level.
Instruction book
2920 1449 00