11
3.3.1 Generator Supply
Connection to the electrical supply should be made through a switch or circuit breaker rated at 250VAC, 15A with a minimum short circuit rating
of 10KA. All of the current carrying conductors should be disconnected by this device.
The device chosen should be clearly and indelibly marked as the disconnecting device for the equipment and be located in close proximity to the
equipment and within easy reach for the operator.
Overcurrent protection must be fitted as part of the building installation. This protection should be selected in accordance with local and national
code regulations with a minimum short circuit rating of 10KA.
The protective earth conductor should be longer than the associated phase conductors so that in the event of the cable slipping in the cable
gland, the earth will be the last to take the strain.
3.3.2 Dryer Supply
If a Parker domnick hunter pre-treatment air dryer is used, it should be connected to the generator at the dedicated DIN rail terminals.
Note: Refer the documentation provided with your dryer for additional information on installation requirements.
3.3.3 Remote Switching
The generator may be controlled remotely by connecting a remote start / stop circuit to digital input #4 on the control board. When the circuit is
open the generator should remain in standby mode, closing the circuit should initiate a start command.
To enable the remote switching function refer to 4.4.3 of this guide. Once the remote switching function has been enabled the local start control
will no longer function.
3.3.4 Alarm Contacts
Each generator is fitted with a set of volt free relay contacts designed for remote alarm indication and are rated 1A max @ 250Vac (1A @
30Vdc). The alarm circuit should be connected between the “COM” and the NC terminals of JP18. Under normal operation the relay will be
energised and the alarm circuit will be open. When a fault occurs, e.g. power failure, the relay will de-energise causing the alarm circuit to be
complete.
3.3.5 4–20mA Analogue Output
The oxygen content detected by the generators internal analyser may be re-transmitted to external peripherals using the 4-20mA linear
analogue output. The output is a linear current source, with 10 bit resolution, which increases from 4mA (Zero Oxygen) to 20mA (Full Scale
Deflection). The FSD of the internal analyser is factory set to a default value of twice the generators specified purity. For % purity generators the
maximum FSD is set to 6%.
Note: The oxygen purity setting of the generator is marked on the rating plate.
The table below shows the correlation between the purity settings of the generator and the output current. The FSD can be altered in menu 3.8
of the control software (refer to section 4.4.3 for details).
When the remote switching function is enabled the generator can start without warning.
If remote fault indication relay is used, the electrical enclosure will now contain more than one live circuit
and in the event of the mains supply being disconnected, the fault relay connections will remain live.
Generator
Purity
Full Scale Deflection
Resolution
4mA
-
20mA
10ppm
0
-
20ppm
1ppm
=
0.8mA
100ppm
0
-
200ppm
1ppm
=
0.08mA
0.05%
0
-
0.1%
0.01%
1.6mA
0.1%
0
-
0.2%
0.01%
=
0.8mA
0.5%
0
-
1%
0.01%
=
0.16mA
1%
0
-
2%
0.01%
=
0.08mA
2%
0
-
4%
0.01%
=
0.04mA
3%
0
-
6%
0.01%
=
0.026mA
4%
0
-
6%
0.01%
=
0.026mA
5%
0
-
6%
0.01%
=
0.026mA
Содержание MAXIGAS MX104
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