Issue:
How to get a MP503 current input reading in Tracer SC/SC+
Resolution:
This solution is for Tracer SC V4.1 or higher, prior to this this solution does not work. Tracer SC's should be updated to the 4.1 release.
How to get a mA input on a MP503 to read percent. The same process can be used for any other units or input/Output types.
1. Configure input in Rover for mA and note which input is used.
2. Discover the device with Tracer SC/SC+ and create a custom template.
3. On the second page of the template, select the input that you want to convert. In this example it will be Current 4 which represents the current value for input 4 on the MP503. Do not map more than one key for a particular input. Each input has Voltage, Current, Binary Status, Binary Percent and Temperature.
4. Select the (...) icon to the right of the key to create a custom key. The rest of the example will talk about how to configure the custom key to look like this:
5. Name the key with a meaningful name that want the users to see when viewing the equipment. In the example we named it Outdoor Air Humidity.
6. Very important step, select the Show More Key Details. This is where the magic will happen and the mA value the MP503 on the input will be converted into a meaningful value. Note that the value is in Amps in the SC/SC+, not in mA. Set the following properties on the key details:
a. Update interval
b. Units
c. Page location (Status page/Configuration/Details)
d. Minimum Value - give a buffer as the point will go into fault if the value drops below this value.
e. Maximum Value - give a buffer as the point will go into fault if the value rises above this value.
f. Multiplier and offset. See below on how to determine the value.
The Range and offset tool will use mA instead of amps. If you complete the calculation using mA, then multiply the Range by 1000 and use that on the AI multiplier (The offset will not change).
Example. Range and offset for a 4-20mA humidity sensor is, Range = 6.25, offset = -25. You will multiply the range by 1000 to use it on the Tracer SC+ (Multiplier = 6250, Offset = -25) because the reading on the Tracer SC+ is in Amps not mA. (Range = Multiplier)
Another way is to enter the information in Amps directly into the Range and offset calculator. (See image below)
Download Range and offset calculator from here > https://home.ingerrand.com/sites/softwaredownloads/SitePages/Tools-RangeOffset.aspx
7. Select apply to return to the template
8. Create template and install the device. If changes need to made to the key, this can be done from the SC/Tools/User Equipment Keys. Remember, the equipment must be refreshed if the keys are modified.
This show the above key for input 3 in the SC+ being displayed. Once this is done users can put this value on graphics by selecting the value directly from the equipment properties in TGE or in TGP2 using the equipment and application blocks.
If not using percent make note of the SC/SC+ system units. Example from the field wanted 4-20mA from MP503, to equal -0.20 inches H20 to +0.20 inches H20. Using method above range and offset calculated multiplier (range) of 25, and offset of -0.300.
On this SC+ the custom key always read very close to -0.300 +/- 0.002 inches. The value didn't change even when running the output from 4mA all the way to 20mA.
The problem was the SC+ had system units set to SI. In this case the SC or SC+ use pascals rather than inches H20. The SC/SC+ was using the wrong multiplier for pascals. -0.20 inches = 49.768 pascals, and +0.2 inches = 49.768 pascals. If you put these values in the range and offset calculator, you come up with much larger multiplier of 6221.0.
With an SC/SC+ set to SI system units, you need to enter values into the range and offset in whatever system units the SC/SC+ is using, which might be different from user preference units. With the above multiplier (Range) of 6221, the SC+ showed the correct value of -0.2 to +0.2 inches H20.
Network Variables view from Rover
Index = NV
Changes:
11/10/23 MDD Moved to HelpCenter
5/20/19 JOL Added notes on inches of H20 to Pascals.
2/7/2017 JAS - Link to get the Range and Offset Calculator
02/02/14 MDD: Verified fixed, users should now convert the mA reading directly to values of appropriate units in Tracer SC templates and custom keys.
12/8/14 JOL both CRs marked fixed for v4.1 in February
8/282014 MDD: Created CR65603 and CR65604 to address this issue. Sent
Other Question/Problem/Cause Statements:
- How to get a MP503 current input reading in Tracer SC
- How do you determine the multiplier and offset for a mA input from a MP503 installed on a Tracer SC?
- How do you configure the AIP in the Tracer SC to read mA from a MP503?
- How to use a MP503 with a humidity sensor 4-20 mA current input. How to set this up on the SC key to read percent?
- How to create a custom key to change current to percent on a MP503.
- How to convert a raw value on a device to a unit value in Tracer SC.
Facts:
- Tracer MP503
- Tracer SC
Hub:https://hub.tranetechnologies.com/docs/DOC-106585