12-19
CONTROL SYSTEM
SM DLSDCI 3-A.1 GB
12.5
Run Mode
Run mode is the default operation mode of the system. This is the standard operation mode that is active in field application
(at customer site).
System can go from run mode to other operation modes through keyboard or serial ports.
12.5.1
Mode Setting
Thermal mode defines the ODU operation mode. There are three possible operation modes:
1.
STBY
– Standby mode
2.
COOL
- the unit operate at cooling cycle
3.
HEAT
- the unit operates at heat pump cycle (deicer will be treated as sub-mode of heat
mode in the thermal Mode setting).
The last mode will be stored in the EEPROM, and it will be restored on system power up, where the default value is
STBY
.
12.5.2
Compressor Speed Control
The following diagram describes the sequence of the Target Frequency calculations:
TROUBLESHOOTING
Service Manual
Multi Cinco 100 DCI
12-25
Revision 0
12.5.1
Compressor Speed Control
The following diagram describes the sequence of the Target Frequency calculations:
12.5.1.1
Compressor Min On/Off time
Compressor minimum ON and OFF time is 3 minutes except during protections.
12.5.1.2
Compressor Startup
When started, compressor speed reaches certain level (usually 30
÷
40 RPS) and will not go below that during
the first 5 minutes except when compressor is forced OFF.
12.5.1.3
Compressor start up fail
If the compressor does not succeed to complete the startup procedure, it will report a compressor lock fault
code. It than retries the startup procedure every 10 seconds and up to 3 minutes than it wait 3 minutes before
starting the next compressor startup sequence.
12.5.1.4
Compressor operation while OFAN Error
In case an OFAN error a cured for 10 continues seconds and the compressor is on, the compressor will be set
to OFF until OFAN error will recover.
NLOAD calculation
Max/Min freq limitation
NLOAD re-calculation
(Every 1minute)
In Protection (Prot status
other than Normal)?
StepFreq control
Illegal freq checking
Final target freq
Yes
No
