Starting Equipment; Unit-Mounted Vfd - Carrier 19XRV Start-Up, Operation And Maintenance Instructions Manual

REAR MOTOR OIL SUPPLY TO
FORWARD HIGH
SPEED BEARING
I
(
FWD MOTOR
LABYRINTH
GAS LINE
MOTOR
COOLING LINE
PRESSURE
TRANSDUCER
OIL
ISOLATION PUMP
VALVES
OIL
OIL HEATER
COOLER OILPUMP
MOTOR
SIGHT
GLASS
FILTER
ISOLATION
VALVE
GLASS
ISOLATION
VALVE
Fig. 4- Lubrication System
t LINE
STARTING EQUIPMENT
All 19XRV units am equipped with a VFD to operate the
centrifugal hermetic compressor motoc A power panel controls
the oil pump, and various auxiliary equipment. The VFD and
power panel m'e the main field wiring interfaces for the
contractol: The VFDs are mounted directly on the chillel:
Three separate circuit breakers ale inside the st_utel: Circuit
breaker CBI is the VFD circuit breaker The disconnect switch
on the stmler fiont cover is connected to fills breakel: Circuit
breaker CBI supplies power to the VH).
The main circuit breaker (CBI) on the front of the starter
disconnects the main VFD current only. Power is still ener-
gized for the other circuits. Two more circuit breakers
inside the VH) must be turned off to disconnect power to
the oil pump, PIC III controls, and oil heatel:
Circuit breaker CB2 supplies l15-v power to the control
panel, oil heater, and portions of the starter controls.
Circuit breaker CB3 supplies power at line voltage to the oil
pump. Both CB2 and CB3 are wired in pm'allel with CBI so
that power is supplied to them if the CBI disconnect is open.
Do not touch the power wiring or motor terminals while
voltage is present, or serious injury will result.
Unit-Mounted VFD
--
The 19XRV chiller is equipped
with a variable frequency drive motor controller mounted on
file condensel: See Fig. 5-7. This VFD is used wifll low voltage
motors between 380 and 480 wtc. It reduces the starting current
inrush by controlling the voltage and fiequency to the compres-
sor motol: Once the motor has accelerated to minimum speed
the PIC IIl modulates the compressor speed and guide vane
position to control chilled water temperature. The VFD is
further explained in the Controls section and Troubleshooting
Guide section, pages 11 and 79.
Operational p_uameters and fault codes are displayed rela-
tive to the drive. Refer to specific (hive literatme along with
troubleshooting sections. The display is _dso the interface for
entering specific chiller operational p_u'ametel_. These ptuame-
ters have been preprogrammed at the factory. An adhesive
backed label on the inside of the drive has been provided for
verification of the specific job paralneters. See Initial St_ut-Up
Checklist section for details.