3516526A02 Ed. 01
28
Alarms
The device warns the user through an on-screen message as to activation of a relay (if a relay has been set as an
alarm) and a sound alarm when the criteria programmed in the parameters are met.
Maximum / minimum temperature alarm
It shows the message “AK” or “AL” when the temperature in
sensor 1 reaches the value configured in parameters A1 (maximum
temperature) and A2 (minimum temperature).
This value may be:
• Absolute (A0=1): The temperature at which the alarm should activate must be indicated in A1/A2.
• Relative to the SP (A0=0): The increase or decrease in the number of degrees necessary for the alarm to
activate, in relation to the set point, must be indicated in A1/A2. This option enables us to change the set point
without having to reset the maximum and minimum alarms.
Parameter A10 establishes the differential of both parameters (Hysteresis).
Example
We configure the following parameters in a controller: SP=2, A1=10, A10=2
- If A0=0 (Relative to the SP), the maximum temperature alarm will activate when 12 degrees are
reached in sensor 1, and will deactivate when 10 degrees are reached.
- If A0=1 (Absolute), the maximum temperature alarm will activate when 10 degrees are reached in
sensor 1, and will deactivate when 8 degrees are reached.
External alarm / severe external alarm
The message AE (External alarm) or AES (Severe external alarm) is
displayed when the digital input configured as external alarm or
severe external alarm is activated.
The severe external alarm also deactivates all the loads and,
therefore, temperature regulation stops. When this alarm disappears, the device returns to its normal operation.
At least one of the digital inputs must be configured as an external alarm (l10 or l20=2) or as a severe external
alarm (l10 or l20=2).
Evaporator sensor error alarm due to moisture ingress
If, at the start of defrost, the temperature in sensor S2 is 20°C higher than the temperature in sensor S1, the defrost
ignores sensor S2 and completes due to time-out.
The display shows the message E2, activates the alarm relay and audible alarm.
The alarm can be silenced, but alarm icon
B
will not disappear until:
• The controller is switched off and then on again.
• Defrost without error is started in sensor S2.
If the 2nd evaporator sensor (l20=10) has been enabled, it will behave in the same way, but displaying the message E3.
Summary of Contents for 16526A
Page 43: ...3516526A02 Ed 01 43...
