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Controller 450 User's Guide
Chapter 5 Maintenance
5.5.13 Adjustment of Isolation Amplifier
5.5.14 Adjustment of Reference Voltage.
5.5.15 System Restart following Maintenance Activities
5-82
The isolation amplifier DSTY 101 is adjusted in the same way as analog input boards, that is,
for zero point (Z) and full scale (G).
If a live zero (4 mA) is used, a basic value is jumpered in accordance with the unit description.
The output signal is then adjusted to 2.000 V with the input signal 0.000 mV
(4 mA, 500 ohm ±0,01%).
DSAI 133 and DSAX 110 have accurate internal reference voltage for self-calibration. You can
check this reference voltage and adjust as necessary with an accurate voltmeter as follows.
Measure at the test terminal X3 between pins 1 and 2 where 2 is to be at +10 V. The extension
board DSFB 110 is used for adjustment (trim potentiometer R9 for DSAI 133 and R14 for
DSAX 110 inputs and R8 for outputs at X3:3-4).
As an alternative, the board is moved to an accessible part of the I/O subrack.
Maintenance carried out On-line
If fault finding and module replacement has been made on-line the new module and its system
function will be automatically initialized and restarted within a few seconds.
Maintenance carried out Off-line
It is assumed that the controller has been manually stopped by the start mode selector set in
position 2 (STOP) (followed by depressing of the ENTER button).
To get into the OPERATION mode perform as follows:
1.
Reflect the consequences to the process by a restart of the controller.
2.
Set the start mode selector on the processor module in position 1 (AUTO).
3.
Depress the ENTER button.
4.
The controller will be in OPERATION mode within a few minutes. This is indicated by P1
on the processor module character display. If any start program in the application program,
the controller operation will restart accordingly.
Mains Supply has been Disconnected
It is assumed that the RAM backup has been available during the time of power supply
disconnection. To get into the OPERATION mode perform as follows:
1.
Reflect the consequences to the process by a restart of the controller.
2.
Check that the start mode selector on the processor module front is set in position 1
(AUTO).
3BSE 002 415R701 Rev A
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