Daikin V3, Technical Manual

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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.