Despatch MIC1422 Controller User Manual

Page 57

9.3 Calibrating The Secondary Analog Input

Equipment Required

DC linear input source (0 - 5 V and 0 - 20 mA) with an accuracy better than +/-
0.05% of reading.

Case assembly, wired for appropriate input supply (90 - 264V AC 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 line power lead is

disconnected. On the CPU PCB, configure link jumpers LJ10 and LJ11 (see Figure
A-2). Connect the remote setpoint input lead and apply input signal.

2. Connect the line power lead to the Controller. Power-up the Controller and leave

switched on for five minutes.

3. Enter Calibration Mode (Section 9.1). The upper display will then show Input Type

Number, in the form:

iP_1

and the lower display will show:

CAL

4. Using the UP/DOWN keys, change the input type number as required (see Table 9-

2).

NOTE: If required, only one input type may be calibrated.

5. Press the AUTO/MANUAL key to change the upper display to show:

_ _ _ _

After a few seconds, the upper display will either (a) return to the initial Input Type
Number display if calibration was successful, or (b) display:

FAIL

In the latter case, the link jumpers and wiring should be checked.