T-CU19-JAN24-1
Page 25
R1: serious alarm; R2: normal alarm
Note: Bcen activation (serious alarm) is based on Alarm Relay R1
Table 18: LCD Display - Alarm Status
LED
Alarm
Require Action
Steady On
Not active
Auto or manual reset
Blinking
Active
Manual reset
•
Auto reset:
An alarm condition is created but when cleared, the unit will restart automatically.
•
Manual reset
: An alarm condition is created and requires resetting manually before the unit can restart.
•
To reset alarm
: Press button ALARM on the LCD display for a few seconds.
Table 19: Details Error Code from Activation of ALW25
Code
Description
Possible Cause
Solution
1
Overcurrent
The drive has detected a current supplied
that is too high due to:
- sudden strong load increase;
- wrong parameters values or inadequate
motor.
Check the drive and compressor
model and the cables.
2
Motor overload
The current supplied has exceeded the
motor rated current over the maximum time
accepted
Check the drive and compressor
model and the cables.
3
Overvoltage
The DC voltage of the intermediate circuit
has exceeded the limits envisioned due to
high over-voltage peaks on the power
supply network.
-
4
Undervoltage
The DC voltage of the intermediate circuit is
below
the limits envisioned due to:
- insufficient power supply voltage;
- fault inside the drive.
In the event of temporary cut-off of
the power supply,
reset the alarm and re-start the
drive. Check the power
supply voltage.
5
Drive overtemperature
The temperature inside the drive has
exceeded the
maximum level allowed.
Check that the quantity and flow of
cooling air are
regular. Check that there is not dust in
the heat sink.
Check the environment temperature.
6
Drive under temperature
The temperature of the drive is inferior to
the minimum level allowed.
Closed metal panel to warm up the
ambient where the drive is installed.
7
Overcurrent HW
The drive has detected an instantaneous
current
supplied that is too high due to:
- sudden strong load increase;
- motor cables short circuit;
- Incorrect compressor model.
Check the compressor model and the
cables.
10
CPU error
Loss of data in memory
Call for assistance
11
Parameter default
Execution of reset parameter default
command;
Parameters user setting corrupted
Set parameters again
12
DC bus ripple
Input power supply phase loss, three-phase
power
supply unbalance
Check the input power supply phases
to the drive
13
Data communication fault
Data reception failure
Check the serial connection. Switch
the drive off and
back on again.
14
Drive thermistor fault
Internal fault
Call for assistance
16
Drive disabled (STO input
open or de-energized)
Cable disconnected
External pressure switches disconnected
Check the wiring.
Manual reset high pressure switch
17
Motor phase fault
Compressor cable disconnected
Check the connections of the
compressor cable
19
Speed fault
Wrong parameters values or unsuited load
Switch the drive off and back on
again and check the
parameters are properly set. Check
the motor load.
