Despatch MIC1462 Controller Manual User Manual

Page 79

SECTION 12: CALIBRATION MODE

To enter the Calibration Mode from Base Mode:

1. Press the MODE key until Calib appears in the message display.

2. Press the SCROLL key to enter the Calibration Mode.

To return to Base Mode, cycle power to the control.

12.1 Calibration Procedure

NOTE: Calibration should be attempted only on Controllers on which calibration
errors have been encountered (see CALIBRATION CHECK).

CALIBRATING THE UNIVERSAL INPUT

Equipment Required

1. Input source with an accuracy better than +/- 0.05 of reading:

a) Thermocouple inputs: Thermocouple simulator, “K” type with compensated leads
b) DC linear inputs: 0 - 50 mV, 0 - 10 V or 0 - 20 mA
c) RTD inputs: decade resistance box with connections for three-wire input (or

equivalent)

2. Case assembly, wired for appropriate input supply (90 - 264 VAC 50/60 Hz, 20 - 50

VAC 50/60 Hz or 22 - 65 VDC)

Calibration Procedure

1. Ensure that the Controller is powered-off and that the mains (line) lead is

disconnected. On the CPU PCB, fit the appropriate link jumpers (see Figure B-3,
Appendix B). Connect the appropriate input lead (see Table 12-1).

2. Connect the mains (line) lead to the Controller. Power-up the Controller and leave

switched on for five minutes (for RTD and DC Linear inputs) or 30 minutes (for
thermocouple inputs).