58
AFDH-SVN01A-EN
Installation
Required reprogramming of UCP2 controls
For the chiller to operate properly with the AFDH drive, the UCP2 control mode needs to be changed
to the AFDB control option and the following tabled list of menu parameters need to be set to the
recommended values shown.
Note:
For detailed instructions on how to operate the Clear Language Display of a UCP2 control
and how to access and set the menu parameters required for proper chiller operation with
the AFDH drive, please refer to the CVHE-M-7 Water-Cooled Hermetic CenTraVac® Models
CVHE and CVHF 50 and 60 Hz Cooling-Only and Heat-Recovery Direct-Drive CenTraVacs
with UCP2 Control Panels, Operation and Maintenance manual.
Table 19. UCP2 menu parameters for proper chiller operation with AFDH
1.
Starter Type:
The highest model level of AFD drive available in the UCP2 starter type menu
parameter is the AFDB. The principles of the AFDB control algorithm are the same as the
operating principles of AFDH model drives.
Note:
The UCP2 - AFDB control algorithm allows speed reduction to as low as 38 Hz. However,
if the highest level AFD algorithm level available within the UCP2 control starter type
menu parameter is AFD, this UCP2 can still work with the AFDH drive but the maximum
speed reduction allowed will only go as low as 42 Hz.
Note:
If the UCP2 starter type menu parameter does not show any AFD type values, this control
is not compatible with any model of adaptive frequency drive.
2.
Condenser Pressure Sensor Option:
There must be a condenser pressure installed on the
chiller and this option must be enabled within the UCP2 control for proper chiller operation with
an AFDH drive.
3.
AF Adaptive Speed Control Algorithm:
For the AFDB control algorithm to work, this
parameter must be enabled.
4.
AF Leaving Water Standard Deviation:
This value indicates the standard deviation
permitted in the evaporator leaving water temperature (ELWT) from the chilled water setpoint
to allow speed decreases. The smaller this value, the more stable the ELWT must be before
speed decreases will be allowed to occur. The standard deviation is adjustable from 0.5 to 4.0°F,
in 0.1°F increments. Under most circumstances, optimal chiller performance is achieved by
using the default value of 1.0°F.
Parameter Name
Default Value
Recommended Value
(a)
1.
Starter Type
Y-Delta
AFDB
2.
Condenser Pressure Sensor Option
Not Installed
Installed
3.
AF Adaptive Speed Control Algorithm
Enable
Enable
4.
AF Leaving Water Standard Deviation
1.0
1.0
5.
AF Pressure Coefficient Constant
800
Must be Calculated
(b)
6.
AF Re-Optimization Factor
0.30
0.30
7.
AF Re-Optimization Timer
24
24
8.
AF Boundary Pressure Coefficient Y-Intercept
0.40
0.40
9.
AF Boundary Pressure Coefficient Y-Intercept Maximum
2.00
2.00
10.
AF Pressure Error Deadband
0.03
0.03
11.
AF Proportional Speed Gain
50
50
(a) Unless otherwise specified, the default value is the correct value to use for these parameter settings. These setting values have
proven to achieve the most efficient operational performance on the majority of centrifugal chillers equipped with an AFD drive.
(b) This value must always be calculated. Refer to the full description of this parameter on the next page for the formula to use to
determine the correct value to enter for the specific machine, and an example calculation.
Summary of Contents for AFDH
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