Chapter 2. Installation
Moisture Target Series 6 Hygrometer User’s Manual 29
2.6.4b Connecting the Fault Alarm
If enabled, the fault alarm trips when one or more of the following faults
occurs:
• power failure
• range error (configurable)
• watchdog function system reset
Note: The watchdog function is a supervisory circuit that automatically
resets the unit whenever a system error occurs.
The fault alarm may operate in fail-safe mode and uses pins 2 and 3 to
provide a “normally closed” contact. When the MTS6 is operating in a
non-fault state, the fault alarm relay is energized to open the contact
between pins 2 and 3. When a fault occurs, the fault alarm relay is
de-energized to close the contact between pins 2 and 3.
Note: The contact between pins 1 (normally open) and 2 works in the
opposite way. The alarm is energized to close the contact during
ordinary operation and the alarm is de-energized to open the contact
when there is a fault.
IMPORTANT: Ensure that the power is off before proceeding.
To wire the fault alarm, make connections to the upper terminal block on
the back of the MTS6, as shown in Figure 25 and Figure 26 on page 19.
IMPORTANT: To maintain good contact at each terminal block and to avoid
damaging the pins on the connector, pull the connector
straight off (not at an angle), make cable connections while the
connector is away from the unit, and push the connector
straight on (not at an angle) when the wiring is complete.
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