99
8.
Shutdown Procedure
8.1.
Emergency shutdown
Immediately turn off the Main Power Switch on top of the ACM 150 monitor to disconnect
power to all the internal circuits.
Figure 66. Main Power Switch
8.2.
Planned shutdown
8.2.1. Line power
• Be aware of any impact that shutting down the ACM 150 monitor may have on your
facility and prepare for it, e.g., ‘fail-safe’ relays that activate alarms on loss of power or
shut off gases automatically when this system is not online. Use appropriate
precautions to avoid unscheduled interruptions of production.
• Turn off the Main Power Switch, Figure 66, located on top of the ACM 150 monitor.
• Follow Lockout / Tagout Procedure When shutting down the monitor for service or
relocation.
8.2.2. Utility gases
The ACM 150 monitor uses compressed air (global) and nitrogen. The user is required to
provide an external shut-off valve located nearby (refer to Utility gases and exhaust piping).
These valves can remain open during the shutdown, provided these utility gases and their
supply components remain connected.
Under these conditions, you should close the external shut-off valves:
• The system is shut down for an extended period, removed from service, or relocated.
• The venturi pumps or gas cells are serviced.
• The utility external connections (Figure 25) or the internal supply lines are
disconnected.
CAUTION
This is a high-pressure safety hazard. The compressed air (CDA) supply pressure
exceeds typically 100 psig (7 kg/cm
2
). After shutting off the external supply valve,
check the internal pressure regulators on the CDA Panel, Figure 20, to ensure that
they read zero. This confirms that the pressure has bled down and is safe to
continue.
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