Perform Mbc Calibration And Clearance Checks; Check Motor Cooling Valves; Exv Strainer Refrigerant Isolation Valves; Ups - Carrier AquaEdge 19MV Start-Up, Operation And Maintenance Instructions Manual

Perform MBC Calibration and Clearance Checks

The initial calibration of the active magnetic bearings is per-
formed before the chiller is shipped from the Carrier facility. If
it becomes necessary to recalibrate, then select the Motor-
Compressor icon on the home screen, then press the up arrow
to navigate to the MBC status page. Under "MBC Calibration"
select the "start calibration" icon. See Fig. 15 and 16. The sta-
tus of the calibration process will be displayed beneath the but-
ton. The results of the calibration are displayed on the calibra-
tion screen as well as saved to the MBC flash memory. The
calibration process is done while the bearings are not levitated.
It moves the shaft at high force around the available clearance.
Fig. 15 — MBC Status Page
The first calibration will be performed in the chiller factory. In the
field MBC calibration is required when:
• After replacement of MBC
• After replacement of magnetic bearing, aux bearing, or
amplifier components.
• If PIC6 displays an Average-Gap-Change warning.
NOTE: Calibration cannot be performed if chiller is in vacuum
condition. Quick test function must be enabled to perform a
calibration.
The MBC performs clearance checks with the shaft levitated. It
will check radially in 8 directions and axially forward and back-
ward. Recorded changes are a measure of the health/wear of the
auxiliary bearings. A manual clearance check can be performed
by selecting "MBC Clearance Check" from the MBC Status
screen. The clearance check is initiated when the "Start Manual"
icon is selected in the MBC Clearance Check screen (Fig. 16).
Note that Quick Test must be Enabled in order complete a MBC
clearance test or MBC calibration.
Clearance checks needs to be performed, recorded, and included
in commissioning paperwork for baseline purpose when:
• Unit is commissioned (base line purpose)
• If the MBC registers a drop of the rotor
Fig. 16 — MBC Calibration Screen
The PIC will automatically initiate a clearance check upon unit
startup if:
• an increase in the shaft drop count is detected
• The speed sensor option is disabled
• The unit is configured for the option "clearance check on
startup"
The MBC Clearance Check screen contains information of the
data captured from the clearance check procedure. Radial Bearing
J is the first stage end radial magnetic bearing (RMB). The
H bearing is the thrust magnetic bearing (TMB) located on the
first stage end. Finally, the K bearing is the second stage radial
magnetic bearing.

Check Motor Cooling Valves

Before initial startup verify that the two isolation valves on either
side of the filter-dryer and moisture indicator are in the open posi-
tion. On initial startup monitor the motor winding temperatures to
verify proper cooling.

EXV Strainer Refrigerant Isolation Valves

Before startup, confirm the two refrigerant isolation valves for the
EXV strainer are open.

UPS

The UPS is shipped from the factory with the battery disconnect-
ed. When power is available for charging the battery, open the
high voltage section of the power panel and remove the cover of
the UPS by pulling it outwards (Fig. 17). Once cover is removed
connect red wires to the red plug and black wires to the black plug.
The battery requires 12 hours to fully charge.
After periods of storage or inactivity, the UPS battery may re-
duce in charge. Before initial startup, apply power to the UPS,
observe charge level, and, if necessary, allow UPS to charge ful-
ly before attempting startup.
NOTE: It may take up to 12 hours to fully charge the UPS bat-
teries. Manufacturer's estimated UPS shelf life is 6 months.
NOTE: If battery is replaced, it should be logged in the UPS
menu located in the Configuration Menu. A battery replacement
alert or alarm will be cleared once the replacement is logged.
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