Atlas Copco GA 11 VSD MED, Инструкция

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(1) Counters
(2) Running hours
(3) Motor starts
(4) Load relay
(5) VSD 1-20 % rpm in % (the percentage of the time during which the motor speed
was between 1 and 20 %) (compressors with frequency converter)
The screen shows a list of all counters with their actual readings.
Note : the example above is for a frequency converter driven compressor. For a fixed speed compressor, the
actual screen will be somewhat different.
3.9 LAN or local control
Flipping the position of the LAN / local switch and pressing the on/off button leads to 3 different states of the
compressor:
1. Flipping the LAN/LOCAL switch to LAN.
This should be the Slave’s default state so shouldn’t entail a change in situation. When coming from a
different state, putting the switch to LAN control will put the ES-MED in charge (unless if the ES-MED
has a fault) to control the compressors. The LAN symbol should appear on the display (the local symbol
should disappear). LAN control means that the load/unload commands come from the Master ES-MED,
not the own pressure sensor. Pressing the off button is not possible in this mode, so emergency situations
requiring the compressor to stop have to be handled with the emergency stop button or main switch.
2. Flipping the LAN/LOCAL switch to LOCAL and pressing the ON button on the Slave.
When flipping to LOCAL, the ON state is the standard, so pressing the ON button should have no effect.
When coming from the OFF state (see next combination), pressing the ON button will put the Slave in
charge to control its compressor, based on its pressure sensor. This combination is referred to as the local
automatic state. The LAN symbol should disappear, the local symbol should appear. This mode is usually
only needed during service or problem solving.
3. Flipping the LAN/LOCAL switch to LOCAL and pressing the OFF button on the Slave.
This will stop the compressor. This combination is referred to as the local manual state. This mode is
usually only needed during service or problem solving.
LAN control Local control
Automatic operation The compressor is automatically
loaded and unloaded based on
the Master settings The compressor is automatically
loaded and unloaded based on its
own pressure sensor
Manual operation Not applicable Compressor is stopped
3.10 Emergency forced local
The Emergency Forced Local (EFL) function starts every compressor that is not in local stopped state
automatically based on only one input: the compressor's local pressure transducer sensing a pressure lower
than 80% of the nominal pressure. The red LED is lit, and a plant fault is transmitted to the ES-MED. Once
the pressure is equal or higher than the cut-out pressure, the compressor goes unload and/or stop. This alarm
(and EFL status) can only be reset manually, and only when pressure is above 80% of the nominal pressure.
Navigate to the protections menu and press the
reset button:
Instruction book
38 2920 7104 10