Required Reprogramming Of Ucp2 Controls - Trane CVHE Installation Manual

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
Table 19. UCP2 menu parameters for proper chiller operation with AFDH
1. Starter Type
2. Condenser Pressure Sensor Option
3. AF Adaptive Speed Control Algorithm
4. AF Leaving Water Standard Deviation
5. AF Pressure Coefficient Constant
6. AF Re-Optimization Factor
7. AF Re-Optimization Timer
8. AF Boundary Pressure Coefficient Y-Intercept
9. AF Boundary Pressure Coefficient Y-Intercept Maximum
10. AF Pressure Error Deadband
11. AF Proportional Speed Gain
(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.
1. Starter Type: The highest model level of AFD drive available in the UCP2 starter type menu
2. Condenser Pressure Sensor Option: There must be a condenser pressure installed on the
3. AF Adaptive Speed Control Algorithm: For the AFDB control algorithm to work, this
4. AF Leaving Water Standard Deviation: This value indicates the standard deviation
58
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.
Parameter Name
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.
chiller and this option must be enabled within the UCP2 control for proper chiller operation with
an AFDH drive.
parameter must be enabled.
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 .
Default Value Recommended Value
Y-Delta
Not Installed
Enable
1.0
800 Must be Calculated
0.30
24
0.40
2.00
0.03
50
(a)
AFDB
Installed
Enable
1.0
(b)
0.30
24
0.40
2.00
0.03
50
AFDH-SVN01A-EN