Emerson MSP422 manual Selecting the Action on Alarm Condition, Hold

Mobrey MSP422

Reference Manual

IP2013, Rev BA

February 2012

NOTE:

The MSP422 transmits nominally at once per second. Therefore, a damping time of zero will not necessarily give an immediate response.

NOTE:

See Figure 4-1 on page 4-3 for a map of the programming menu structure and how to access all the menu options.

To change the output damping:

a)If entering the menu system from the PV display, press the green button ↓ repeatedly until the “d” menu option is indicated (see above note.)

b)Press the blue button → to enter the menu “d”. The display indicates the present damping value.

c)If this value is correct, press the red button ↵ and then the green button to get to the next menu option.

d)Press the blue button → to start editing. The first digit flashes to indicate it can be edited.

e)Press the green button ↓ repeatedly to edit the flashing digit.

f)Press the blue button → to select the next digit. The digit flashes to indicate it can be edited.

g)Repeat steps (e) and (f) until the last digit is flashing, and edited as required.

h)Press the blue button → to confirm the new damping value. None of the digits should now be flashing.

i)If the new value is correct, press the red button ↵ to save. The display changes to the next menu option.

j)If the new value is incorrect, press the blue button → to exit to the menu. The “d” re-appears; re-start at step (b) or press ↓ for the next menu.

Selecting the Action on Alarm Condition

Screen display:	AL
Default:	Hold

The transmitter signals an alarm condition if the target echo is lost for more than 10 seconds.

There are three options for an alarm condition:

Hi The current on the two-wire loop will increase to 21 mA and remain there until a correct target echo is recovered. The display flashes alternately “LE” and the alarm action.

Hold The current will freeze at the value it was last reading and remain there until a correct target echo is recovered. The display flashes alternately “LE” and the last valid reading.

Lo The current on the two wire loop will decrease to 3.6 mA and remain there until a correct target echo is recovered. The display flashes alternately “LE” and the alarm action.

NOTE:

See Figure 4-1 on page 4-3 for a map of the programming menu structure and how to access all the menu options.

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