Detcon 140 - Manual (Page 31)

140 Operators Manual
Model 140 Operator Manual Rev. 1.8 Page 27 of 29
8.4 Optional Remote Alarm Reset/Acknowledge Switch
Model X40 controllers are designed for an optional Remote Alarm Reset/Acknowledge Switch. This
enables the user to reset or acknowledge alarms without having to open the NEMA 4X enclosure. The
Reset Switch is a momentary type switch and will typically be mounted on the bottom or side of the NEMA
4X enclosure. Toggle the momentary switch to execute the reset/acknowledge function.
The Remote Alarm Reset/Acknowledge Switch is wired to the terminal block labeled SW3 on the backside
of the Main Controller PCB. Refer to Figure 5.
8.5 Optional Type Z Enclosure Purge Assembly
Model X40 controllers are available with an optional, externally mounted, Model 1001A Z-Purge system.
This purge assembly achieves a Class 1, Division 2, Group CD area classification. The Type Z-Purge
assembly is installed on the X40 Controller at the Detcon factory.
The Z-Purge option is factory wired to automatically removed AC power from the controller if there is a
loss of pressure. The Z-Purge is not wired to remove DC Power or battery backup power from the unit. It
is the responsibility of the user to manually shut off all power sources if pressure is lost or the X40
Controller enclosure is opened.
The Type Z purge option includes a factory installed bypass switch that can be used to continue operation
of the Model X40 Controller even when the NEMA 4X enclosure is opened and the purge system pressure
is lost. The bypass switch can be toggled between Bypass and Normal, where in the Bypass mode the
purge protection and Class 1 Div 2 area classification is lost.
NOTE1: The Z-Purge option is factory wired to automatically removed AC power from the controller if
there is a loss of pressure. The Z-Purge is not wired to remove DC Power or battery backup power from
the unit. It is the responsibility of the user to manually shut off all power sources if pressure is lost or the
X40 Controller enclosure is opened.
NOTE2: Use of the purge bypass switch invalidates the Class 1 Div 2 area classification and should not be
done without proper authorization. When purge pressure is lost, Class 1 Div 2 area classification is lost
regardless.
The instruction manual for the Model 1001A Type Z purge system is supplied separately. Refer to this
manual for details on purge supply requirements.