Chromalox 1604 User Manual

26
ERROR MESSAGES
OVERRANGE, UNDERRANGE AND
SENSOR LEADS BREAK INDICATIONS
The device is capable to detect a fault on the
process variable (OVERRANGE or
UNDERRANGE or SENSOR LEADS BREAK).
When the process variable exceeds the span
limits set by configuration parameter P 1 an
OVERRANGE condition will be shown on display
as show in the following figure:
An UNDERRANGE condition will be shown on
display as show in the following figure:
When P37 is equal to 0, the following conditions
may occur:
- The instrument is set for one output only and if
an OVERRANGE is detected, the output turns
OFF (if reverse action) or ON (if direct action).
- The instrument is set for heating/cooling action
and an OVERRANGE is detected, "rEV" output
turns OFF and "dir" output turns ON.
- The instrument is set for one output only and if
an UNDERRANGE is detected, the output turns
ON (if reverse action) or OFF (if direct action).
- The instrument is set for heating/cooling action
and an UNDERRANGE is detected, "rEV"
output turns ON and "dir" output turns OFF.
When P37 is different from zero and an out of
range condition is detected, the instrument
operates in accordance with P37 and P38
parameters.
The sensor leads break can be signalled as:
- for TC/mV input : OVERRANGE or
UNDERRANGE selected by
a solder jumper
- for RTD input : OVERRANGE
- for mA/V input : UNDERRANGE
Note: On the mA/V input the leads break can be
detected only when the range selected has a zero
elevation (4/20 mA or 1/5 V or 2/10 V)
On RTD input a special test is provided to signal
OVERRANGE when input resistance is less than
15 ohm (Short circuit sensor detection).
ERROR MESSAGES
The instrument performs self-diagnostic algorithm.
When an error is detected, the instrument shows
on the lower display the “Err” indication while the
upper display shows the code of the detected
error.
ERROR LIST
SEr Serial interface parameter error.
100 Write EEPROM error.
150 CPU error.
200 Tentative to write on protected
memory.
1604-1-BC.p65 5/16/00, 10:25 AM26

Chromalox 1604 Specifications

General

Brand	Chromalox
Model	1604
Category	Temperature Controller
Language	English