Honeywell Searchpoint Optima Plus - 12.6 Test 4-20 mA Loop Integrity; 12.7 Calibrate the 4-20 mA Loop

MAN0905_Issue 7_07/17 Searchpoint Optima Plus with optional HART
®
output
Operating Instructions
2108M0550
57
12.6 Test 4-20 mA Loop Integrity
It is recommended that the 4-20 mA loop integrity is tested by setting the Searchpoint Optima Plus to
outputanoverrangecurrent.Thiswillconrmthattherearenofaultsinthesystemthatwouldcausea
current limit.
Note:Thisfunctionwilltimeoutafter10minutesofinactivity.
Note:Whenconnectingordisconnectingamultimeter,powerofftheSearchpointOptimaPlus,otherwise
the unit will indicate a latched warning that the 4-20 mA loop was broken. If this occurs, it can be cleared
usingtheHART
®
communications. See Clear Faults or Warnings.
1. Select Device Setup.
2. Select Test
3. Select mA Loop Test
4. The display shows a warning message, press OK.
5. Select Other.
6. Input 21 and press Enter
Searchpoint Optima Plus will now output 21 mA.
7. Check that the signal at the controller is > 20 mA, then press OK
8. SelectEnd.
9. The display shows a note that the Searchpoint Optima Plus will return to normal operation,
press OK.
10.Thedisplayshowsaconrmationmessage,returntotheWelcomescreen.
Note:Ifthecurrentatthecontrollerisnotcorrect,checkthe4-20mAloopconnectionsandcabling,and
check that the loop resistance is less than 600 Ω.Incurrentsourcemode,forsupplyvoltagesof18to
20 Vdc the maximum loop resistance is 500 Ω.
12.7 Calibrate the 4-20 mA Loop
Ifrequired,the4–20mAcurrentoutputcanbetrimmedtomatchthecontroller.Thisisnotagas
calibration.
Note:Whenconnectingordisconnectingamultimeter,powerofftheSearchpointOptimaPlus,otherwise
the unit will indicate a latched warning that the 4-20 mA loop was broken. If this occurs, it can be cleared
usingtheHART
®
communications. See Clear Faults or Warnings.
Note:Ifthisprocessisabortedatanytime,itmaybenecessarytowait10minutesbeforeattemptingthe
calibration again. See Chapter 14, Troubleshooting.
12. Commissioning using
HART
®
Communications