Xylem WEDECO SMOevo PLUS Series Original Manual page 89

ON
Nitrogen Boost (Option)
Release of the Nitrogen boost including status indication.
Once the gas line to the generator is opened, the nitrogen boost solenoid valve opens too
and air is added to the oxygen. This measure is taken to achieve a more efficient ozone
production in the event of too high oxygen purity (> 2.5 quality, from 3.0 quality on).
OFF
ON
Automatic Restart (Option)
Release of the Automatic Restart including status indication.
When the system is in operation and mains fluctuations of the main supply line are detected
by the phase monitor during operation, the system can carry out an Automatic Restart when
the voltage returns. The supply voltage of the PLC and the safety relays is buffered by a 24V
UPS to enable Automatic Restart.
OFF
ON
The following table shows the possible control signals for system and converter start.
Signal (Control)
Release System
Release Converter
Manual_SMOevoPLUS_eng_01.2019.doc
When the system is out of opertion, a partial flow is continuously
discharged in order to keep the dew point stable at the start level.
Recommended for shorter periods of system shutdown or in the
case of required high uptime.
The nitrogen boost solenoid valve remains closed, no air is added to the
feed gas.
With the valve opened, air is added too in order to reduce the purity of the
oxygen. If the overall system is equipped with a dosing compressor and a
fault message is shown, the valve closes immediately. The entire system
remains in operation.
If mains fluctuations are detected, no Automatic Restart is carried out,
the system remains in fault condition.
The system has stopped automatically due to a detected mains
fluctuation and is in fault condition. As soon as the phase monitor
reports a stabilisation of the supply voltage, the system tries to
acknowledge the existing fault messages automatically in order to
initialise an Automatic Restart. This process is signalled on the touch
panel via the operating message "Automatic Restart in progress".
Local
(Hardwired)
x
x
Manual Ozone Generating System SMOevo
Remote Remote
(Network)
x
Operation
Remote
(Wedecontrol)
x x
x x
page 89 of 179
PLUS