plug-in
Cod. +030221881 rel. 1.5 - 26/10/10
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8.3 Additional HACCP module
8.3.1 General characteristics
The optional HACCP module expands the control functions of the plug-in family instruments by adding temperature control with
the recording of alarm siutuations due to the exceeding of the maximum temperature threshlolds for significant periods, which may
derive from operating anomalies either in the controlled machines or due to power failures. The added control functions are
designed to help the user monitor the food storage temperature in order to comply with the checking and recording phases required
by the HACCP standards on correct food storage.
As an option a function can be enabled to generate defrost requests programmed at set times.
HACCP alarm management: The control performed by the al HACCP module features the management of two different events
which may be dangerous for correct food storage:
1. HA alarm: if the control temperature is higher than a maximum value for a longer than a set delay time. The threshold
value corresponds to the value set on the plug-in instrument for the high temperature alarm (SET+AH), the delay time
corresponds to the sum of the times set for two parameters: parameter Ad on the plug-in instrument, and parameter tr on
the HACCP module;
2. HF alarm: power failure for an extended period (greater than one minute) with temperature at power resumption higher
than the maximum value (SET+AH).
In both cases an alarm is generated, with a signal on the display of the plug-in instrument and the LED, and alarm relay or buzzer
active if present. Furthermore, the status of the alarm is recorded, and can then be displayed.
8.3.2 Installation
The HACCP module is mounted using a standard DIN rail, for wall-mounting an adapter is supplied (DIN rail plate), to be
fastened to the wall and onto which the module can be mounted.
The module-instrument connecting cable is supplied with the module and is 50 cm long; the HACCP module must thus be placed
at a distance that is compatible with this connection, which can not be extended. The module is also powered directly by the plug-
in instrument using this connection.
8.3.3 Setting the main operating parameters
During installation the main parameters to be checked are listed here below; in particular, please remember that two parameters
determine the enabling or disabling the detection of the HACCP alarms:
AH: Temperature alarm threshold
if set to 0 disables the detection of alarms HA and HF, any pending alarms are not cancelled;
if set to a value > 0 means the alarm threshold is set to the value = SET+AH and the alarm detection is enabled.
tr: HACCP alarm detection delay time
if set to 0 disables the detection of alarms HA and HF (as above);
if set to a value > 0 means the delay time is equal to Ad + tr (Ad is the alarm delay time parameter of the connected plug-in
instrument).
tu, th, t': setting the clock: day of the week, hours and minutes of the internal clock
to: display parameter and reset alarms.
During installation some HACCP alarms will probably have to be cancelled from the start-up of the machines. Setting the value to
0 resets all the pending HA and HF alarms, including all the variables for recording the status of the alarms.
For a complete description of the parameters, please refer to the paragraph HACCP module parameters.
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