Measured Data Submenu: Calling Up Measured Data; Shut-Down Reset; Reset Of Motor Overload - Atlas Copco GA55 User Manual

3. Looking for more details is carried out in a similar way as
described in steps 3 and 4 of section 7.2.3. If necessary,
stop the compressor and remedy the fault.
1. Suppose that the shut-down screen as shown in Fig. 7.2
exists.
2. The display indicates:
- <<Shd>>: the compressor is shut down due to too high
a compressor <<element outlet>> temperature
- <<Max>>: the maximum level is <<110>> degrees
celsius
- The actual temperature is <<112>> degrees celsius
The fourth line of the screen shows the available function
keys, i.e.:
- <<Menu>> to return to the submenu allowing to choose
between <<shut-downs>>, <<protections>> and <<start
failures>>
- <<Rset>> (reset)
3. Switch off the voltage and remedy the trouble. After
remedying and when the shut-down condition has
disappeared, switch on the voltage and press the key
<<Rset>> (reset). Press the keys <<Menu>> and
<<Main>> to return to the main display and restart the
compressor by means of button I (8-Fig. 2.1).
If the drive motor overload relay (F21) or fan motor circuit
breaker (Q15) 1) trips, the compressor will be shut down and
LED (3-Fig. 2.1) will blink. Following screen appears:
Motor overload
Shd NC
Not normal
Menu ** **
F1 F2
Fig. 7.6. Example of a motor overload display
The example indicates that:
- The compressor is shut down due to motor overload
- The contacts of the motor overload relay are normally closed
- The condition is <<Not normal>> (i.e. the contacts are
actually open)
The top line of the display and the indicators (**) are blinking.
1. Switch off the voltage and remedy the trouble. The overload
relay (F21) resets itself after cooling off but the circuit
breaker (Q15) 1) must be reset manually. The <<Not
normal>> message will change into <<Normal>>.
2. Switch on the voltage and press the key <<Rset>> (reset)
and then the keys <<Menu>> and <<Main>> to return to
the main display.
3. Restart the compressor by means of button I (8-Fig. 2.1).
Footnotes chapter 7
1) For GA30 up to GA90C only.
12
** Rset
F3
To call up the measured data:
- The actual pressure
- The actual temperature at the outlet of the compressor
element
- The programmed shut-down and warning temperatures for
the compressor element
- The dewpoint (only for Full-feature compressors)
- The status of the motor overload protection
on GA55/90C also:
- The actual pressure difference over the oil separator
- The status of the fan motor overload protection
on water-cooled GA55/75 also the actual cooling water outlet
temperature
1. Activate the main menu by pressing the key <<Menu>> (5-
Fig. 2.1).
2. Scroll through the available options by using the scroll keys
(6-Fig. 2.1) until the option <<Measured Data>> is shown
on the second line of the display.
3. Press the key <<Slct>> (select) (5-Fig. 2.1). A screen
similar to the one in Fig. 8.1 appears:
Delivery air
bar
Menu
F1 F2
Fig. 8.1. Example of a measured data display
The display shows that the outlet pressure is 8.8 bar and
that the key ↓ can be used to call up other measured data.
4. If one of the sensors is linked to a protection function (shut-
down or motor overload), a screen similar to the one in Fig.
8.2 appears:
Element outlet
C
Shd Max
Menu Warn
F1 F2
Fig. 8.2. Example of a measured data display
The display indicates that:
- The reading shown is the compressor <<element outlet>>
User manual
8.8
↓
F3
↑
85
↓
110
F3
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