Alarms And Messages - Gattetti LCA User Manual

5 Alarms and messages

Any time an alarm condition is detected, the controller will prompt the following actions:
• the buzzer sounds (if previously enabled - see P4 parameter and dip-switch no.3 on the terminal - and if the machine is
not in stand-by)
• the alarm relay energizes
• the temperature value blinks on display
• the yellow LED on the single-compressor main board will blink with increased frequency
• the alarm code appears on the LCD alternatively with the temperature value.
After the alarms have been cleared either with automatic reset or by pressing the
(for alarms with manual reset), the controller will restore normal operating conditions:
• the buzzer turns off
• the alarm relay is disenergized
• the temperature value blinks no longer
• the yellow LED blinks at normal frequency
• the alarm code disappears from the LCD.
If the alarm condition persists, the actions described above will be performed again.
External digital alarms
"µchiller" has 9 alarms detected by means of external digital contacts (24Vac); such external alarms are not detected with
the unit in stand-by and, with parameter P5 set to 1, and all have a manual reset.
Type
High pressure circuit 1
Low pressure circuit 1
Compressor 1 overload
Fan overload circuit 1 (*)
Flow switch
High pressure circuit 2
Low pressure circuit 2
Compressor 2 overload
Fan overload circuit 2 (*)
(*) Active if the defrost end by external contact is not enabled (dA=0).
High pressure
The alarm condition is detected independently of the status of the pump and compressors. The compressors are
immediately forced into the OFF mode (previously set protection time-intervals are ignored) and at the same time the
buzzer, the alarm relay and the lighting of the display are activated. Fans are activated at max. speed for 60s to face the
alarm situation. After this period they are stopped (in case of two compressor units with only one fan circuit, after 60s the
fans do not stop but are managed according to the circuit temperature/pressure where the alarm condition is not present
Low pressure
The alarm condition is detected only if the relative compressor is ON, independently of the status of the pump. The
compressors are forced into the OFF mode immediately (previously set protection time-intervals are ignored) and at the
same time the buzzer, the alarm relay and the lighting of the display are activated. The parameter P7 allows the activation of
the low pressure alarm if the measured pressure is less than 1bar (after the P3 delay).
RG66000889-REV.00
Digital
Alarm
input
1 open
2 open
3 open
4 open
5 open
8 open
9 open
10 open
11 open
Delay Reset
-- manual (automatic. with P5=1)
P3 manual (automatic. with P5=1)
-- automatic
-- automatic
P1 e P2 manual (automatic with P5=1)
-- manual (automatic. with P5=1)
P3 manual (automatic. with P5=1)
-- automatic
-- automatic
29
and keys simultaneously for 5s.
Message
on display
H1
L1
C1
F1
FL
H2
L2
C2
F2