Post on 05-Apr-2018
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FMM-420 MODULE
PROGRAMMING UPDATE
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FMM-420 MODULE
Before we can connect a device to our SLC, it
makes sense to understand the operating
characteristics of a 4-20 device
In most cases, the device will have 3 wires
that connect to the FMM-420 Module.
The wires consist of:
Negative (-)
Sense
Positive (+)
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Select FMM 4-20
FMM-420 MODULE
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After selecting FMM-420 Type Code
CBE-3, 4, 5, 6 and 7 are highlighted.
We will look at specific CBE programming later in this presentation.
FMM-420 MODULE
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FMM-420 MODULE Programming
STEP 1
Specific Device Information
STEP 2Device Thresholds
STEP 3
Device CBEs
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FMM-420 MODULE
4 mA 20 mA
Operating Range is: 4 mA to 20 mA
0 % 100 %
4 mA represents
0 % in this case
20 mA represents
100 % in this case
0100
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Units is the measurement unit of the device:
- Parts Per Million (PPM)
- Parts Per Billion (PPB)
- etc.
FMM-420 MODULE
UNITS is a required field for the device. This value is used as a
programming reference and is not used for FACP computations.
0100
PPM
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If the measurement range is from 0 to 100, you may choose to have a
Hysteresis percentage range of 5.
If so, 9 would be the low end and 14 would be the high end of the
moving percentage range as shown in the graphic below.
4 mA 20 mA
0 9 14 100
5
Hysteresis is a percentage range
along the 4 mA to 20 mA scale
FMM-420 MODULE
0100
PPM
5
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0100PPM
5
When you are satisfied with the Device Parameters
Click the THRESHOLDS button:
FMM-420 MODULE
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FMM-420 MODULE
A blank Threshold screen appears when clicking the Threshold button
When planning your programming in the threshold screen, it is important
to know what Values will be significant for the device you have installed,
because the Value will correspond directly with a CBE
Before inserting a Value, you must check the CBE box on the left.
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FMM-420 MODULE
For this example, I will check ALL the CBEs
Once a CBE box is checked, Latching is automatically checked. If you
do NOT want the Value to trigger a latching event, uncheck Latching.
Keep in mind that CBE 3, 4, 5, 6 and 7 are automatically assigned to
Thresholds 1 5.
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FMM-420 MODULE
At this point in my programming, I have decided to use all the CBEs
and a fairly even range of 15, 30, 45, 60 and 75
These values are what my device will read in its chamber or sensor
Upon this value being recognized, I must decide what EVENT will
correspond with the value
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FMM-420 MODULE
Note that I have several options for my event types.
Since Fire Codes dont allow us to generate a Fire Alarm by
using a GAS detection device, I will select Non-Fire Trouble
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FMM-420 MODULE
When Non-fire Trouble was selected, Trouble 1 automatically appeared
in the Trouble Type field. However, before we can set the Trouble Type,
we must first set our Trigger field.
The choice Specific Level, simply looks at the SPECIFIC Level of your Value.Upper Limit, is when the Value is reached in an upward direction
and Lower Limit is when the Value is reached in a downward direction.
For this example, I will use Upper Limit
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FMM-420 MODULE
Once the TRIGGER Value has been set, we can select a Trouble Type
Our choices are: Trouble 1, Trouble 2 and Device Inhibit
If we choose Device Inhibit, when the FMM-420 is in a self-calibration
state, a trouble will be generated at the FACP.
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FMM-420 MODULE
REMEMBER
Without AHJ approval
Gas Sensing Devices are NOT to be used to indicate a Fire Condition
Z15
Z45
Z30
Z75
Z60
For this example, I have used the Values for the Zone numbers.
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Questions