Generator Supply; Dryer Supply; Purge Economy; Remote Switching - Parker MIDIGAS 2 Benutzerhandbuch

3.3.1 Generator Supply

For safety reasons the generator must be connected to earth at the earth terminal provided on TB1.
The generator supply terminals are designed to accommodate a maximum conductor size of 2.5mm
size the supply cable in accordance with local wiring regulations, taking in to account cable temperatures, installation methods and voltage drop.
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. Refer to
the documentation provided with your dryer for additional information on installation requirements.

3.3.3 Purge Economy

If the pre-treatment dryer is fitted with a purge economy feature, it may be controlled using the volt free relay contacts on JP17. The relay is
energised only when the generator enters standby mode.
Refer to the documentation provided with your dryer for details on purge economy.

3.3.4 Remote Switching

The generator may be controlled remotely by connecting a remote start / stop circuit to JP19-7 and JP19-8 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 "Customer Settings " on page 17 of this guide. Once the remote switching function has been
enabled the local start control will no longer function.
When the remote switching function is enabled the generator can start without warning.

3.3.5 Alarm Contacts

The generator is fitted with a set of volt free relay contacts designed for connection to a remote alarm circuit. The contacts are rated 1A max @
250Vac (1A @ 30Vdc). Under normal operation the relay is energised, when a fault occurs the relay will de-energise causing the relay contacts
to change state.
If the generator is connected to a remote alarm circuit, the electrical enclosure will contain more than one live circuit. In
the event of the generator electrical power supply being disconnected, the fault relay connections will remain live. It is
the users responsibility to provide a disconnection device so that these connections can be safely isolated.
3.3.6 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 "Customer Settings " on page 17 of this guide for details).
Full Scale Deflection
Generator
Purity
4mA
10ppm 0
100ppm 0
250ppm 0
500ppm 0
0.1% 0
0.5% 0
1% 0
2% 0
3% 0
4% 0
5% 0
Resolution
- 20mA
- 20ppm 1ppm
- 200ppm 1ppm
- 500ppm 1ppm
- 1000ppm 0.01%
- 0.2% 0.01%
- 1% 0.01%
- 2% 0.01%
- 4% 0.01%
- 6% 0.01%
- 6% 0.01%
- 6% 0.01%
= 0.8mA
= 0.08mA
= 0.032mA
0.016mA
= 0.8mA
= 0.16mA
= 0.08mA
= 0.04mA
= 0.026mA
= 0.026mA
= 0.026mA
2
(14 AWG). It is the users responsibility to
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