Alarm - Error Configuration - Hanna Instruments HI 720 Instruction Manual

ALARM - ERROR CONFIGURATION

This section is dedicated to all the possible error causes for alarm generation,
and to the actions performed according to the alarm configuration (setup menu
"Error configuration").
Each alarm cause can be referred to an error to which an error code is assigned
and which is logged in a dedicated memory space (see "Event logging" section
for more details).
Five configuring actions are foreseen upon generation of an alarm:
1. Alarm relay de-energized
2. Auto-cleaning (control actions are stopped during auto-cleaning mode)
3. 3.6 or 22 mA fault current for the 4-20 mA output; 22 mA fault current for
the 0-20 mA output
4. Hold mode (entered in any case for EEPROM corruption or serial bus error)
5. Alarm SMS submission to the selected phone numbers
Note The red LED flashes in any case upon an alarm generation, i.e. it
can not be disabled by changing the error configuration.
Errors, error codes & default error handling configuration are listed in this table:
ERROR E r r o r Alarm
Code Relay
Low alarm 01 ON
Max relay ON time 02 ON
Life check error (*) 03 ON
Cond. input overflow (*) 10 ON
Calibration timeout 12 OFF
Broken temp. probe (*) 20 ON
Temperature level 21 ON
Dig.Transmitter error 40 ON
GSM/Modem module err. 50 ON
Temp. compensation error 60 ON
Temp. out of conc. table 61 ON
Cond. out of conc. table 62 ON
Conc. out of conc. table 63 ON
Power reset 90 OFF
EEPROM corruption 91 ON
Watchdog error 92 OFF
Level or pulse signal 99 Level (default value) or Pulse
74
22 mA 3.6 mA Hold Auto-
Fault Fault Mode clean.
Curr. Current
OFF OFF --- OFF
ON OFF --- OFF
ON OFF ON OFF
ON OFF OFF OFF
OFF OFF --- ---
ON OFF OFF ---
ON OFF --- ---
ON OFF ON ---
ON OFF --- ---
ON OFF --- ---
ON OFF --- ---
ON OFF --- OFF
ON OFF --- ---
OFF OFF --- ---
ON OFF --- ---
ON OFF --- ---
(*): When the digital transmitter is used, these errors are generated in the digital
transmitter, but they are handled as if they were generated in the controller.
• The 3.6 mA fault current is always off unless the 4-20 mA output has been
configured; the 22 mA fault current is always off unless the 0-20 mA or 4-20
mA output has been configured.
The 3.6 mA and the 22 mA fault current cannot be both set to ON. If two
errors are active when output is configured as 4-20 mA (#1 or #2), and one
of them is configured for the 22 mA fault current, while the other one is config-
ured for the 3.6 mA fault current, the 22 mA current is let out to the analog
output.
The fault current is automatically disabled when the analog output is used for
controlling (item O.10 equal to "Control-setpoint 1"), no matter whether the
fault current itself has been configured "On" or "OFF".
• In case of a "Temperature probe broken" error, the fault current, if configured,
is let out to both analog outputs (unless O.20 is equal to "Control-setpoint 2").
In all the other cases only the first analog output can let out the fault current.
• The "GSM/Modem module error" is never activated if P .00 is not set to
"HI504900 GSM module" or "HI504901 GSM supervisor". The error will be
active if the instrument is not able to communicate with the GSM/modem en-
gine (for example the serial cable is broken or the engine is not powered), if the
S M S
number of available SMS is finished (setup item P .14) or if the SIM expiration
Send
date is overrun.
• The "Power reset" and the "Watchdog reset" errors are active only for the short
OFF
time of the start-up session (selftests, meter name and version displaying). That
OFF
start-up session ends when the first measurement is acquired and displayed.
OFF
OFF
• When the Hold mode is enabled for the "Life check error", this error can be
OFF
closed automatically if the measurement vary enough.
OFF
Note The alarm relay (when configured to be activated) is de-energized
OFF
(fail-safe ON) continuously or with a pulse of about 5 seconds. This
OFF
parameter can be configured through setup item E.99 (Level or Pulse).
---
If the "Pulse" option is selected, a new pulse will be let out upon
OFF
every new error, no matter whether the red LED is already blinking
OFF
(i.e. some error is active) or not. When the pulse finishes, the relay is
OFF
OFF energized but the error remains still active (red LED blinking) until
OFF the error is closed.
OFF
Note The "Digital Transmitter error" is generated by one of the following
OFF
causes: 1. Digital transmitter is off
2. Connection problems between controller & transmitter
75