Red-lion PCU Manuel d'utilisateur télécharger pdf (Page 86)

APPENDIX “E” - CALIBRATION

CALIBRATION CHECK

The instrument has been fully calibrated at the factory for the voltage and

current inputs. If the unit appears to be indicating or controlling incorrectly,

see Troubleshooting, page 73, before attempting this procedure.

If the controller is suspected of reading incorrectly, the instrument may be

checked for indication accuracy without disturbing the factory calibration.

The parameters to be checked are: voltage reading, mA reading, linear DC

output, Second Input, and Valve Position Feedback. The following

procedures may be used for this purpose.

Note: Allow 1/2 hour warm-up with the controller in an upright position to allow

adequate ventilation to the case before checking these parameters.

VOLTAGE READING CHECK

1.ConnectaDCvoltsourcewithanaccuracyof0.01%orbettertoterminal#8

(+) and terminal #10 (-).

2. Advance to the configuration parameter modules from the normal display

mode.

3.Setthecontrollertoindicatevoltage(VOLt),intheinputparametermodule.

4. Press the “PAR” key until “INP 1” appears in the main display.

5.Pressthe“DSP”key,once,the“%PW”&“DEV”annunciatorswillflash.

6. The secondary display will indicate voltage applied at Terminals8&10.

7. Compare the controller read-out to the standard at various points over the

range (0-10 V). The tolerance is 0.15% of reading ± 1 LSD.

8. Calibrate the controller if the readings are out of tolerance.

CURRENT READING CHECK

1.Connecta current sourcewithan accuracy of0.01%or better toterminal#9

(+) and terminal #10 (-).

2. Advance to the configuration parameter modules from the normal display

mode.

3.Setthecontrollertoindicatecurrent(Curr),intheinputparametermodule.

4. Press the “PAR” key until “INP 1” appears in the main display.

5.Pressthe“DSP”key,once,the“%PW”&“DEV”annunciatorswillflash.

6.ThesecondarydisplaywillindicatethecurrentappliedatTerminals9&10.

7. Compare the controller read-out to the standard at various points over the

range (4 to 20 mA). The tolerance is 0.15% of reading ± 1 LSD.

8. Calibrate the controller if the readings are out of tolerance.

LINEAR DC OUTPUT CHECK

4to20mA

1. Connect an ammeter to the linear output (#11 & #12) with an accuracy of

0.1% or better.

2. Set “ANAS” (Analog Assignment) to “INP”, in Configure Input

Parameters.

3. Drive the input signal level below the programmed “ANLO” value. Check

for 4 mA (±0.02 mA).

4. Drive the input signal level above the programmed “ANHI” value. Check

for 20 mA (±0.03 mA).

5. Calibrate the controller linear DC output if out of tolerance.

0to10VDC

1. Connect a voltmeter to the linear output (#11 & #12).

2. Set “ANAS” (Analog Assignment) to “INP”, in Configure Input

Parameters.

3. Drive the input signal level below the programmed “ANLO” value. Check

for 0 VDC (±20 mV).

4. Drive the input signal level above the programmed “ANHI” value. Check

for 10 VDC (±30 mV).

5. Calibrate the controller linear DC output if out of tolerance.

SECOND INPUT CHECK

The Second Input Check applies to those models that have the Second

Analog Input (Remote Setpoint) and Valve Positioner options. Different

signals are required for each option.

Second Analog Input Check

1. Apply signals over the range of 0 to 20 mA DC to the terminals labeled

Second Input, 4-20 mA+ and 4-20 mA-. The tolerance is 0.2% of full scale

± 1LSD.

2. Calibrate the Second Analog Input if out of tolerance.

Valve Positioner Check

1. Apply signals derived from the resistor string as described in Valve

Positioner Calibration. The tolerance is 0.2% of full scale ± 1LSD.

2. Calibrate the Second Analog Input if out of tolerance.

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Red-lion PCU Manuel d'utilisateur Page 86

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