Atlas Copco GA 37 VSD, Instruction Book

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Green LED fading on/off
Water is not flowing in to the drain‘s tank. If the floater does not reach the upper level for 3
hours, the solenoid is energized for 2 seconds. This cycle is repeated for 5 times (so up to 15
hours). Afterwards, the green light starts fading on/off.
Causes:
• No condensate entering the tank.
• Float mounted incorrectly (upside down).
Checks:
• Is any condensate reaching the drain? Does the water separation take place in the heat
exchanger?
• Is the floater mounted in its correct position, for instance after maintenance?
Solution:
• Although this LED sign does not indicate any kind of failure, the drain can be reset by
pushing the test button (T) for 5 seconds.
Red LED blinking slowly: cleaning routine 1
The drain’s tank is filled and the water cannot be drained or can only be drained very slowly.
In normal operation, the drain gets 20 seconds time to drain all water. If the drain is not
emptied within this time frame, a (first) cleaning routine is activated, alternatively opening and
closing the valve for 2 seconds, during maximum 30 cycles. This routine is started in an
attempt to unblock the drain.
If this first unlock routine is unsuccessful, a second routine will be started.
Causes:
• Filter mesh clogged.
• Not enough pressure on drain.
• Internal problem with the drain.
Checks:
• Is the filter clean and in good condition?
• Is there a minimum pressure of 0.2 bar (2.8 psi) in the drain?
Press the test button (T) for at least 5 seconds to reset the drain.
Red LED blinking fast
If cleaning routine 1 is completed (after 30 cycles) but still unsuccessful, cleaning routine 2 is
activated. This routine will open (3 sec) and close (60 sec) the drain’s valve until a floater is in
lower position, so the water is completely drained.
Meanwhile, the
external alarm signal is activated .
Causes:
• Filter mesh clogged.
• Not enough pressure on drain.
• Internal problem with the drain.
Checks:
• Is the filter clean and in good condition?
• Is there a minimum pressure of 0.2 bar (2.8 psi) in the drain?
From this point onwards, the drain will remain in this routine, even after restart. Press the test
button (T) for at least 5 seconds to reset the drain.
Red LED on
An irreversible error occurred. Replace the drain and keep the failed one for further analysis.
2.6 Regulating system
Description
If the consumption is less than the air output of the compressor, the net pressure increases.
When the net pressure is higher than the set-point (desired net pressure), the regulator will
Instruction book
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