12-20
CONTROL SYSTEM
SM DLSDCI 3-A.1 GB
12.5.2.1 Compressor Min On/Off time
Compressor minimum ON and OFF time is 3 minutes except during protections.
12.5.2.2 Compressor Startup
When started, compressor speed reaches certain level (usually 30÷40 RPS) and will not go below that during the
rst 5 minutes except when compressor is forced OFF.
12.5.2.3 Compressor start up fail
If the compressor does not succeed to complete the startup procedure, it retries the startup procedure every 10
second and up to 3 minutes it will report a compressor lock or unusal behavior.
12.5.2.4 Compressor operation while OFAN Error
In case an OFAN error occured for 10 continues seconds and the compressor is on, the compressor will be set
to OFF until OFAN error will recover.
12.5.2.5 Speed Change Limitations
Acceleration and deceleration will be 1 RPS/sec.
12.5.2.6 Speed Step Limitations
12.5.2.7 Illegal frequencies
Illegal Frequencies are values that the unit is not allowed to be working at. The frequencies and values within
tolerance of ±2 Hz are not allowed.
12.5.2.8 Compressor shutdown Cases
# Shutdown Reason
1 Single: ODU NLOAD=0 (or IDU protections)
2 Single: IDU change to STBY.
3 Multi: All IDU`s become inactive.
4 Deicing (both when going from heat to cool and from cool to heat)
5 ODU Protections
6 Sensor fault: according sensor fault list
7 HPS protection
8 LPS protection
9 OFAN-ERR (Up and Down)
10 PFC TRIP
11 Water Overow
TROUBLESHOOTING
Service Manual
Multi Cinco 100 DCI 12-22 Revision 0
12.5.1.5 Speed Change Limitations
Acceleration and deceleration will be 1 RPS/sec.
12.5.1.6 Speed Step Limitations
12.5.1.7 Illegal frequencies
Illegal Frequencies are values that the unit is not allowed to be working at. The frequencies and values within
tolerance of ±2 Hz are not allowed.
12.5.1.8 Compressor shutdown Cases
nwodtuhS # Reason
1 Single: ODU NLOAD=0 (or IDU protections)
2 Single: IDU change to STBY.
3 Multi: All IDUs become inactive.
4 Deicing (both when going from heat to cool and from cool to heat)
5 ODU Protections
6 Sensor faulty: all sensors
7 HPS protection
8 LPS protection
9 OFAN-ERR (Up and Down)
10 PFC TRIP
11 Overflow
12.5.1.9 Compressor target frequency
During normal operation (excluding protections) the compressor target frequency is set according
to the ODU NLOAD number received from the indoor unit.
ODU NLOAD Target Frequency [Hz]
0 0
0 < ODU NLOAD ≤ q erF ni M q erF ni M
>MinFreq Linear relation between Min and Max freq.
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