TR440
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8.13 Configure the alarms
The following parameters are significant:
Alarm value
8
FAN.
8
8
ALR.
8
8
tRP.
8
8
Cor.
8
Limits for the alarms.
Dependent on the selected program, various alarm settings are
possible(see short operating diagrams)
Hysteresis
8
H .
8
Reset value is calculated from the alarm value + hysteresis, e.g.:
90°C (limit) + -5°C (hysteresis) = 85°C (reset value)
Alarm delay
on
8
dal.
8
An alarm is suppressed for the set time (seconds)
Alarm delay
off
8
dof.
8
An alarm is only switched off after the limit is fallen below (alarm value +
hysteresis) and this time (seconds) has expired.
Relay
8
rel.
8
Closed-circuit current
8
r.
8
:
Relay is operating (attracted) in GOOD
state (= alarm value has not been reached) and releases when the alarm
value is reached.
Advantage: Errors and malfunctions generally lead to an alarm
Disadvantage: Alarm also when the control voltage is switched off.
Unfavourable, e.g., in transformers, especially when the TR440 control
voltage comes from the monitored transformer
Operating current
8
a.
8
:
Relay has released in GOOD state and
operates (attracts) when the alarm value has been reached. No alarm
when the control voltage is switched off and during faults.
Closed-circuit current locked
8
Lr.
8
:
Behaves as with zero signal
current, but an alarm remains active until it is reset with the Set/Reset
key (press ≥ 2s).
Operating current locked
8
LA.
8
:
Behaves as with operating current,
but an alarm remains active until it is reset with the Set/Reset key (press
≥ 2s).
Error /
Malfunction
8
Err.
8
8
rel.
8
-
8
r.
8
-
8
A.
8
-
8
Lr.
8
-
8
LA.
8
Behaviour of the device during faults (sensor fault / device fault)
Involves Relay K4 (not in program 3)
Note:
A locked alarm is not saved in the device zero-voltage maintained time.
That means that if the supply voltage is interrupted, a locked alarm can be reset.
Adjustment procedure (procedure as an example based on Alarm
8
FAN.
8
]):
Select the menu item with the Up/Down key until …
Display
8
FAN.
8
Press the Set key
Display
8
FAN.
8
/
8
100.
8
flashes alternately (actual limit, value can be different)
Set the desired limit using the Up and Down keys
Press the Set key
Display
8
H .
8
/
8
-20.
8
(hysteresis / value) flash alternately
Set the desired hysteresis using the Up and Down keys
Press the Set key
Display
8
dal.
8
/
8
0.
8
(delay alarm / value) flash alternately
Set the desired value with the Up and Down keys
Press the Set key
Display
8
dof.
8
/
8
999.
8
(delay alarm off / value) flash alternately
