Carel plug-in User Manual download pdf (Page 43)

plug-in

Cod. +030221881 rel. 1.3 - 03/05/2006

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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Carel plug-in User Manual Page 43