Hanna Instruments HI 720 Series - Manual (Page 38)

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(*): 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
number of available SMS is finished (setup item P.14) or if the SIM expiration
date is overrun.
• The “Power reset” and the “Watchdog reset” errors are active only for the short
time of the start-up session (selftests, meter name and version displaying). That
start-up session ends when the first measurement is acquired and displayed.
• When the Hold mode is enabled for the “Life check error”, this error can be
closed automatically if the measurement vary enough.
Note The alarm relay (when configured to be activated) is de-energized
(fail-safe ON) continuously or with a pulse of about 5 seconds. This
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
every new error, no matter whether the red LED is already blinking
(i.e. some error is active) or not. When the pulse finishes, the relay is
energized but the error remains still active (red LED blinking) until
the error is closed.
Note The “Digital Transmitter error” is generated by one of the following
causes:
1. Digital transmitter is off
2. Connection problems between controller & transmitter
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 22 mA 3.6 mA Hold Auto- S M S
C o d e Relay Fault Fault Mode clean. Send
Curr. Current
Low alarm 01 ON OFF OFF --- OFF OFF
Max relay ON time 02 ON ON OFF --- OFF OFF
Life check error (*) 03 ON ON OFF ON OFF OFF
Cond. input overflow (*) 10 ON ON OFF OFF OFF OFF
Calibration timeout 12 OFF OFF OFF --- --- OFF
Broken temp. probe (*) 20 ON ON OFF OFF --- OFF
Temperature level 21 ON ON OFF --- --- OFF
Dig.Transmitter error 40 ON ON OFF ON --- OFF
GSM/Modem module err. 50 ON ON OFF --- --- ---
Temp. compensation error 60 ON ON OFF --- --- OFF
Temp. out of conc. table 61 ON ON OFF --- --- OFF
Cond. out of conc. table 62 ON ON OFF --- OFF OFF
Conc. out of conc. table 63 ON ON OFF --- --- OFF
Power reset 90 OFF OFF OFF --- --- OFF
EEPROM corruption 91 ON ON OFF --- --- OFF
Watchdog error 92 OFF ON OFF --- --- OFF
Level or pulse signal 99 Level (default value) or Pulse