Initial Operation & Routine Operation of GRH3 air compressor

Monday - 29/07/2019 04:30
Initial Operation & Routine Operation.
1.Initial Operation
Before operation .
Check whether the compressor is horizontallyinstalled.

Check the internal status of oil level and compressor visually.
Connect the pipe at the compressor°Øs discharge side and open the discharge side valve.
Check whether the voltage and spec of the compressor coincide after connecting to TB1 inside the electrical box.
Keep the surrounding of the compressor tidy..
Start .
Turning on the MCCB, allow the power for the control.

Check whether the [STOP] lamp of the controller is on.
Press [START] button to start operation.
Immediately check the rotation direction of air end, stop it by pressing Emergency Stop button in case of reverse direction and replace 2 phases of the wire connected to TB1 by referring to the following figure.
                   

Press [START] button to restart after the replacement
Immediately re-check whether the rotation direction of air end is correct.
Check whether Micom’s display shows any rises of pressure/temperature.
Check whether it generates any abnormal noise.
Caution:
  • Make sure to check the direction because reverse rotation for several seconds may cause the damage on the air end.
  • Please note that it automatically starts operation in the stand-by modes([P1 HIGH] [P2 HIGH] [AUTO STOP]) if the internal pressure falls.
During Operation
  • Check whether the oil level is between the normal ranges. If insufficient, stop the compressor, check whether the internal pressure is ‘0’ bar and replenish the oil.
  • Check whether it operates under the specified pressure.
  • While opening and closing the discharge-side valve slightly, check whether it converts between load and no-load operation, depending on the pressure.
  • Completely open the ball valve and operate it. Manual no-load operation function test.
  • Press Manual No-Load button to check whether it manually operates under no load. Press it again to check whether it returns to the load operation.
  • Auto start test. If pressing [START] button before the internal pressure falls under 2.0 bar just after stop, it displays [P1 PRESS HIGH]; if the internal pressure falls under 2.0 bar, check whether it automatically starts.
  • Stop
  • Press STOP button and it stops after 10-second no-load operation.
Stop procedure 
[STOP] button on= > No load operation=>  Discharging the internal pressure => Auto stop in 10 seconds.If not using it for a long time, turn off the main power or press Emergency Stop  button to cut off the control power.
Caution: Before the internal pressure is discharged under 2.0 bar just after stop, press [START] button. Then, [P1 PRESS HIGH] message is displayed. Please note that it automatically starts if the internal pressure is lower than 2.0 bar.
2. Routine Operation 
Opening the front cover, check whether the compressor has any impurities or oil leakage. Then, open the electrical box door and visually inspect the tightness of power cable(black). Since the power cable is loosely connected, discoloring the red/white/blue color tubes, turn it off and re-check the cable.
Operation
Press [START] button to start it. During operation, check the oil level. If insufficient, stop the operation and replenish the oil.
StopIf pressing [STOP] button, it stops after 10 second no-load operation.If pressing it again when it stops by [STOP] button, it immediately stops.If the P2 pressure is not formed 2.0 bar and higher in 10 minutes of the operation, it generates.
[P SENSOR TROUBLE] and stops, so check the inhalation valve opening, slightly close P2 side ball valve and operate it.If the P2 side pressure is completely discharge to the air during the operation, the pressure is ‘0’ bar, so at the moment, [P-SENSOR TROUBLE] message is displayed.When it stops for a long time, close the discharge side ball valve to prevent any reverse flow. In addition, press Emergency Stop button or turn off the main power, avoiding any safety accident.
<NOTE>
P1: internal pressure of the compressor

      
P2: end pressure of the compressor
 
   
When changing the operation conditions such as operation pressure, refer to page 49.
The initial values of operation pressure are as follows.
                                                                                                                                                                  <Compressor’s pressure spec.: 7.0bar>
tem Code Initial value
Diff. pressure AR02 1.0bar
Operation pressure AR03 7.0bar
Auto restart pressure AR05 1.0bar
Y-D switchover time T01 5.0Sec
Auto stop time T02 10 minutes

When the above pressure is set, It operates under no-load if it is higher than 7.0 bar or under load if it is 6.0 bar and lower(AR03 -AR02).
When changing operation pressure, other operation data will be automatically changed for the optimal operation.
<NOTE>
How to reset: press [STOP] button. If any trouble occurs during operation, it immediately stops. Then, check trouble causes, take a corrective measure and press [STOP] button to release the trouble.


 

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