Consequences Of The Alarm; Reactions To Alarms Within The Lan Network; Missing Air Flow Alarm Event; Gas Leak Detected Alarm Event - Mitsubishi Electric s-MEXT-G00 006 Technical Manual

TM_s-MEXT_ME28relC_00_12_19_EN
20.8.4

Consequences of the alarm

When a unit detects a disconnection on the local LAN network, the following occurs:
• Signal on the main mask.
•
Forced unit activation in case it is in stand-by.
• Average regulation inhibited, in case it has been previously enabled.
•
Time count interruption for reserve unit rotation.
Moreover, the Master unit activates the reserve units (if they are two, then both).
20.9

REACTIONS TO ALARMS WITHIN THE LAN NETWORK

Some events cause reactions in all the units connected to the pLAN network of the unit where the event itself occurred. These reactions are aimed at preventing the
formation of gas build-up.
The units not in alarm condition will show this reaction through the flashing of the Active Functions mask, to indicate that the behaviour is due to the presence of an alarm in
at least one of the other units connected to the LAN network.
20.9.1

Missing Air Flow alarm event

With this alarm active, the other network units switch the speeds of their fans to maximum level. Units Off from terminal or in Standby from LAN are excluded from the forcing
of the fans and keep the fan speed at the minimum preset limit.
20.9.2

Gas Leak Detected alarm event

With this alarm active, the other network units switch the speeds of their fans to maximum operation level, switch off their external units and open the Direct Free Cooling
dampers (if present) to maximum level. Units Off from terminal or in Standby from LAN are excluded from the forcing of the fans and keep the fan speed at the minimum
preset limit.
Technical manual
TRANSLATION OF THE ORIGINAL INSTRUCTIONS
120