Daikin AKZ9 Series Instruction Manual page 34

PIM00318A_EN.fm Page 32 Tuesday, October 26, 2010 12:37 PM
[Note]
1. When starting auto-tuning, make sure that the oil temperature is nearly equal to the room temperature (in stable condition).
Leave the main machine under no load (stopped).
To complete the auto tuning correctly, start the auto tuning after the power supply to OILCON is turned ON more than 5 minutes.
2. If the remote signal turns OFF or an alarm is activated during execution of auto-tuning, an error occurs (auto-tuning cannot be
executed), and the corresponding error message appears.
To cancel the error, press the
Check the remote signal, or examine the cause of the alarm. After taking a corrective action, execute auto-tuning again.
3. Before starting auto-tuning, select an operation mode to determine the control target thermistor. (Select any operation mode other
than "9".)
Operation mode 0, 3 or 4
Operation mode 1, 5 or 6
Then, set Parameter [n004] by referring to [Note] 4. below.
4. In Step 2, the machine may be over-cooled. To suppress machine over-cooling, specify an auto-tuning end condition in Parameter
[n004].
Parameter [n004] Outlet oil temperature decrease (Auto-tuning end condition)
Setting range: 0.0 to 10.0˚C, Initial value: 8.0˚C
When the outlet oil temperature decreases by the temperature specified in this parameter, auto-tuning (data collection) ends.
If the specified temperature range is too small, temperature control gain may not be correctly calculated. You should set this
parameter to the maximum value in the range where it does not cause damage to the machine.
5. To calculate more suitable temperature control gain based on the data collected in Step 3, you must specify a response coefficient
in Parameter [n005]. (Through response coefficient adjustment, you can select whether to place importance on stability or re-
sponse speed.)
Parameter [n005] P and I gain calculation coefficient (Response coefficient)
Setting range: 0.1 to 10.0, Initial value: 2.0
Setting a smaller value improves stability. Setting a larger value improves response speed.
6. Depending on the condition of the control target (machine), the unit may not calculate suitable temperature control gain in a single
auto-tuning operation. You should execute auto-tuning two or three times to average the calculated values, or use the value
that most frequently appears (except for an extreme value).
To calculate a more suitable temperature control gain, you may change Parameter [n005] (see [Note] 5. above).
7. The temperature control will not be stabilized when the load changes abruptly (transient period).
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key. (The unit returns to the normal mode.)
Inlet oil temperature thermistor
Outlet oil temperature thermistor
n005: Response coefficient
Small
Large
n005 = 2.0
0
(Initial value)
T: Time