Operating instructions (translation from original IT)
Cod. OQ7_5ARG078EN
Emiss. 18-07-08 Rev. 5- Agg. 20-04-16
37
17.5
EPS4.3 TROUBLESHOOTING
N. Allarm
Alarm messages
Cause
Explanation / Remedies
1
Low temperature
Oil temperature below the
programmable fixed limit
The compressor does not start but stores the start order in the
memory. When the min. set temperature is reached for
external causes, the compressor starts automatically. The
message “
T out of scale
” appears in the alarm log.
•
Check heater connection, if present.
•
Install heater
.
2
High temperature
Oil temperature above the
programmable fixed limit
The compressor stops and consequently the oil cools. When
the oil temp. falls below the set limit, the compressor does
not start (it must be restarted) and the message “High oil
temp.” becomes “Temp. out of scale”. The message “T out
of scale” appears in the alarm log.
•
Check the causes of the faulty heat exchange; if the
reading does not agree with the temperature change
the probe.
3
NTC broken
H = NTC short
circuiting.
Connect or replace
L = NTC interrupted or
disconnected
4
(1)
Active emergency
The mushroom switch has
been activated
Release the emergency switch by turning it..
5
Motor thermal
prot
The thermal relay of the
main motor has tripped.
If it does not have automatic reset, reset the thermal relay. Press
the reset key. Check the absorbed current values and the
calibration value.
6
Inverter blocked
The inverter has generated
an alarm
Read the fault indicated on the inverter display. Follow the
instructions in the inverter manual.
7
Fan thermal prot
The fan motor protector
has tripped.
Reset the contact, press the key on the board. Check the current
values and the calibration value.
8
(2)
Incorrect rotation
The electric connection
would make the
compressor turn in the
opposite direction,
damaging it
Switch off the power and invert 2 of the 3 phases.
9
Default data
/
Contact Power System
10
TRD broken
L = Pressure transmitter
disconnected.
Check the connection to the transmitter.
Change transmitter.
H = Pressure transmitter
short circuiting.
11
Maint Group A
The machine has
reached the set number
of working hours to
carry out maintenance of
the Group A, follow the
instructions on the
display
Carry out maintenance and hold down the Reset key for at
least 30 sec.
