Atlas Copco GA50 (W) VSD, Инструкция, Страница: 10 / 32

2920 1190 05
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Industrial Air Division Instruction book
1.4.1 Elektronikon regulator (E1-Figs. 6)
The regulator has following functions:
Controlling the compressor
The regulator matches the compressor output to the air
consumption by speed regulation of the motor.
The regulator stops the compressor whenever necessary:
-
Indirect stop: i.e. the compressor runs at minimum speed
and the net pressure rises to the indirect stop level
- Direct stop: i.e. the compressor runs at a speed in between
minimum and maximum and the net pressure rises above
the direct stop setpoint.
Both settings are programmable; consult the "User manual for
Elektronikon regulator", section "Modify settings submenu".
Note: to prevent the safety valve from opening too frequently
on 13 bar compressors, the setting of the direct stop setpoint
should never be more than 1bar.
Protecting the compressor
If the compressor element outlet temperature exceeds the
programmed shut-down level, the compressor will be stopped.
This will be indicated on the control panel (Fig. 7a). The
compressor will also be stopped in case of overload of fan motor
(M2-Figs. 2).
If the compressor element outlet temperature exceeds a
programmed value below the shut-down level, this will also be
indicated to warn the operator before the shut-down level is
reached.
Protecting the motor
GA50 (W) VSD
If the motor temperature should rise above the setting of the
regulator, the regulator will stop the motor.
GA90 (W) VSD
If the motor temperature should rise above the warning setting
of the regulator, the regulator will temporary reduce the motor
speed until the temperature has decreased again. A warning
appears on the display. If the temperature should not drop below
the warning level after the regulator has decreased the motor
speed, the regulator will stop the motor.
Monitoring components subject to service
The regulator continuously monitors the oil, oil filter, oil
separator, air filter and motor regreasing. Each input is
compared to programmed time intervals. If these limits are
exceeded, a message will appear on display (4-Fig. 7a) to warn
the operator to service the indicated component.
Automatic restart after voltage failure
For compressors leaving the factory, this function is made
inactive. If desired, the function can be activated. Consult
Atlas Copco.
Warning If activated and provided the module was in the
automatic operation mode, the compressor will
automatically restart if the supply voltage to the
module is restored within a programmed time
period (this time period is called the power
recovery time).
The power recovery time can be set between 1
and 254 or to symbol 00!. If the power recovery
time is set to 00!, the compressor will always
restart after a voltage failure, no matter how long
it takes to restore the voltage.
1.4.2 Control panel (Fig. 7a)
To control the compressor and to read and modify
programmable parameters, the regulator is provided with a panel
including:
Ref. Designation Function
1 Automatic Indicates that the regulator is
operation LED automatically controlling the
compressor.
2 Voltage on LED Indicates that the voltage is
switched on.
3 General alarm LED Is normally out. Is alight or blinks
in case of an abnormal condition.
See below.
4 Display Indicates:
-
the name of the sensor of which
the actual reading is displayed
- the unit of measurement and
actual reading
- messages regarding the motor
speed, a sensor error, a service
need or a fault
5 Function keys Keys to control and program the
compressor. The actual function
of each key is abbreviated and
indicated on the bottom line. The
most common ones are listed
below.
6 Scroll keys As long as an arrow is shown on
the right side of the display, the key
with the same symbol can be used
to scroll through the display.
7 Tabulator key Key to go to the next field of the
display.