Specifications

Power Entry and Control Module–Direct Current (PECM-DC), Continued
The Maxum II Modular Oven is typically installed with an internal 24V
power supply that supports a wide range of AC power input options.
DC Power Input
(Optional)
In addition to AC input, the PECM-DC allows for power via external 24V
DC supply. In this configuration the internal DC power supply is not
installed. The requirements for this configuration are detailed in the
specification table at the beginning of Chapter 1 of this manual.
The connections to the PECM-DC are shown in figure 2-16 below.
Connections
Figure 2-16: PECM-DC Connections
One function of the PECM-DC is to monitor the state of the purge
condition for the analyzer, if purge is required. The atmospheric
reference is connected to the outside via a tube. If the switch detects that
the pressure difference between internal and external drops below the
required threshold (pressure difference of at least 05 inches water), then
the switch is enabled. This sends a signal via the purge signal cable to
the CIM, which illuminates the purge fault LED and creates a purge
alarm.
Purge
When a purged enclosure is not required per the safety codes, connector
IP1 on the PECM-DC can be used to disable the purge alarm. Refer to
Figure 2-16 for connector locations.
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