Danfoss ADAP-KOOL AKD 102 Operating Instructions Manual page 94

6 How to Programme the Frequency Converter
25-21 +Zone [unit]
Range:
3.00* [0-9999.99]
6
25-22 -Zone [unit]
Range:
3.00* [0-9999.99]
6.1.4 Main Menu Mode
Select the Main Menu mode by pressing the [Main Menu] key. Illustration
6.2 shows the resulting read-out, which appears on the display of the
GLCP.
Lines 2 through 5 on the display show a list of parameter groups which
can be chosen by toggling the up and down buttons.
Each parameter has a name and number which remain the same regardless of the programming mode. In the Main Menu mode, the parameters are
divided into groups. The first digit of the parameter number (from the left) indicates the parameter group number.
All parameters can be changed in the Main Menu. The configuration of the unit (par.1-00) will determine other parameters available for programming.
For example, selecting Closed Loop enables additional parameters related to closed loop operation. Option cards added to the unit enable additional
parameters associated with the option device.
94
example, if the set-point is - 20˚C and the NZ is set to 4˚C, a suction pressure equivalent to a
temperature between - 24˚C and - 16˚C is tolerated. No staging or destaging will occur within this
zone.
Function:
When a large and quick change in the system demand occurs, the system pressure rapidly changes
and a quicker staging or destaging of a fixed speed compressor becomes necessary to match the
requirement. The +Zone defines the range where the + zone delay is active.
Setting the +Zone too close to zero could defeat the purpose with frequent staging at momentary
pressure changes. Setting the +Zone too high might lead to an unacceptably high or low pressure
in the system while the +Zone Delay timer (par. 25-24) is running. The +Zone value can be opti-
mized with increased familiarity with the system. See ++Zone Delay, par. 25-26.
To avoid unintended staging during the commissioning phase and fine tuning of the controller,
initially set the +Zone to a large value beyond any expected pressure peak. This implicitly disables
the override function for pressure peaks. When the fine tuning is complete, the +Zone should be
set to the desired value. An initial value of 3˚C is suggested.
Function:
When a large and quick change in the system demand occurs, the system pressure rapidly changes
and a quicker staging or destaging of a fixed speed compressor becomes necessary to match the
requirement. The -Zone defines the range where the - zone delay is active.
Setting the -Zone too close to zero could defeat the purpose with frequent staging at momentary
pressure changes. Setting the -Zone too high might lead to an unacceptably high or low pressure
in the system while the -Zone Delay timer (par. 25-25) is running. The -Zone value can be optimized
with increased familiarity with the system. See --Zone Delay, par. 25-27.
To avoid unintended staging during the commissioning phase and fine tuning of the controller,
initially set the -Zone to a large value beyond any expected pressure drop. This implicitly disables
the override function for pressure drops. When the fine tuning is complete, the -Zone should be set
to the desired value. An initial value of 3˚C is suggested.
Illustration 6.9: Display example.
MG.11.O1.02 - ADAP-KOOL ® is a registered Danfoss trademark
®
ADAP-KOOL Drive AKD 102 High Power