30
DRR450 - User manual
Pv
Comand Spv
Alarm Spv
Off
On
On
Hysteresis
parameter
> 0
Time
Alarm
output
Comand Spv
Comand Spv
Comand Spv
Comand Spv
Alarm Spv
Alarm Spv
Value of alarm setpoint less
than “0” and hysteresis value
greater than “0” (Par. 20
a.1.H
> 0).
N.B.: with hysteresis less
than “0” (
a.1.H
< 0) dotted
line moves under the alarm
setpoint.
10
Table of Anomaly Signals
If installation malfunctions, the controller switches off the
regulation output and reports the anomaly noticed on word
1009 (error fl ags).
For example, the controller will report failure of a connected
thermocouple bringing to 1 the bit 0 of the word 1009.
For other signals see table below:
Cause
What to do
BIT2
Error in EEPROM cell
programming.
Call assistance
BIT0
Cold junction sensor
failure or room
temperature outside of
allowed limits.
Call assistance
BIT3
Incorrect confi guration
data. Possible loss of
instrument calibration.
Verify that confi guration
parameters are correct.
BIT1
Broken thermocouple or
temperature outside of
limits.
Verify the connection
with the sensors and their
integrity.
BIT4
Missing calibration.
Call assistance
Summary of Contents for DRR450
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