Table of Contents
Advertisement
PRESYS
| Instruments
Reverting to factory calibration
The controllers store the factory calibration parameters in the non-volatile memory
and these can be retrieved at any time.
Should there be any suspicion that some instrument malfunction might be due to
an improper recalibration procedure use the RECUP option (see figure 38).
RECUP - this is the option allowing the retrieval of factory calibration values. This
option is valid for both the inputs and outputs.
Enter calibration level 8 and select whether to retrieve input or output values.
Select the option RECUP and press ENTER to reload factory values.
4.5 - Hardware maintenance guidelines
Prior to returning the instrument to factory check the following possible causes of
instrument malfunction.
Instrument showing display errors
After turning on the equipment start the test routine to check the RAM and
E2PROM integrity.
Should any of these components have problems the display will show the
following error codes:
Err. 1 - RAM error
Err. 2 - E2PROM error
In the event of a RAM error, turn the equipment off and then on again to check
whether the error message persists. If affirmative, return the instrument to factory.
In the event of an E2PROM error, press ENTER and reconfigure the equipment.
Turn the equipment off and then on again to check whether the error message persists.
If affirmative, return the instrument to factory.
During configuration the display may show the following error messages:
The message Err.3 will occur whenever an attempt is made to configure as alarm
relay (relay 2, relay 3 or relay 4) any of the outputs 2, 3 or 4 which may have been
configured as control output or vice-versa. To prevent this
make sure to disable the related control outputs 2, 3 or 4 prior to enabling any of the
alarm relays 2, 3 or 4.
If, during the auto-tune procedure the operator changes the type of control (by
changing from dual to SP.re or Casc) or modifies the control algorithm (from PID to
ON/OFF or HC) the display will show the following error message: Err.4.
Instrument with no display
Check that the power supply arrives at the power terminals 23 and 24 in the
controllers I/O terminals.
Check the integrity of the 1.0 A fuse F1 on the Power Supply Board as shown on
figure 32. Due to its ceramic shielding a continuity measurement will be required to
detect a possible blown fuse.
DCY-2050 and DCY-2051
from happening,
Maintenance
Page 61
Advertisement
Table of Contents
