1763H532 Ed.02
7.6.- Alarms
The unit warns the user by displaying an on-screen message when the programmed criteria are met.
Max/Min Temperature Alarm
Shows the
AH
or
AL
message when the temperature in probe 1 reaches the value set in
the
A1
(maximum temperature) or
A2
(low temperature) parameters.
This value can be:
Absolute (A0=1): A1/A2
should indicate the temperature at which the alarm should
be activated.
Relative to SP (A0=0): A1/A2
should indicate the number of degrees above or
below the set point at which the alarm is activated. This
option allows users to adjust the set point without having to
modify the high and low alarm settings.
Parameter
A10
sets the differentials for both parameters (hysteresis).
Example
In a controller we configure the following parameters:
SP
=2,
A1
=10,
A10
=2
- If A0=0 (relative to SP), the maximum temperature alarm goes off when probe 1 reaches 12 degrees
and is disabled when it reaches 10 degrees.
- If A0=1 (absolute), the maximum temperature alarm goes off when probe 1 reaches 10 degrees and
is disabled when it reaches 8 degrees.
In the case of configuring the alarms in relation to the
SP
(
A0
=0), the value set for the
SP
parameter is
taken as a reference, even though the “CHANGE SET POINT” function may have been activated.
External alarm/severe external alarm
Displays the message
AE
(external alarm) or
AES
(severe external alarm), when the digital
input configured as external alarm or severe external alarm is activated.
The severe external alarm also deactivates all the charges, therefore, the temperature regulation
is stopped. When this alarm disappears the device returns to its normal operation.
At least one of the digital inputs must be configured as external alarm (
P10
or
P11
=2) or severe external alarm
(
P10
or
P11
=3).
Defrost alarm completed by time.
Shows the
Adt
alarm message when a defrost terminates by time-out, if parameter
A8
=1.
Door open alarm
Displays the
PAb
message when the door stays open for a time greater than that set with parameter
A12
. (One of
the digital inputs must be configured as door contact (
P10 or P11=
1).
Pump down malfunction error (Stop)
Displays the
Pd
message if a malfunction is detected when the installation is stopped
using the pump down manoeuvre. (See p. 13).
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