16
There is a display on the front of the Benshaw, Inc., solid-
state and wye-delta starters that is useful for troubleshooting
and starter checkout. The display indicates:
• line voltage
• control voltage status
• power indication
• proper phasing for rotation
• start circuit energized
• ground fault
• current unbalance
• run state
The starter is further explained in the Check Starter and
Troubleshooting Guide sections, pages 73 and 99.
Unit-Mounted Wye-Delta Starter (Optional) —
The 19XR chiller may be equipped with a wye-delta starter
mounted on the unit. This starter is used with low-voltage mo-
tors (under 600 v). It reduces the starting current inrush by con-
necting each phase of the motor windings into a wye configu-
ration. This occurs during the starting period when the motor is
accelerating up to speed. Once the motor is up to speed, the
starter automatically connects the phase windings into a delta
configuration. Starter control, monitoring, and motor
protection is provided by Carrier’s Integrated Starter Module
(ISM) except for Benshaw MX3™ wye-delta starters which do
not use an ISM.
Unit-Mounted VFD (Optional for 575 v
Only) —
The 19XRV unit can be equipped with a variable
frequency drive motor controller mounted on the unit. See
Fig. 11. This VFD is used with low voltage motors at 575 v on-
ly. All other unit-mounted VFDs use PIC III controls. A VFD
reduces the starting current inrush by controlling the voltage
and frequency to the compressor motor. Once the motor has ac-
celerated to start-up speed the PIC II modulates the compressor
speed and guide vane position to control chilled water tempera-
ture. The VFD is further explained in the Controls section and
Troubleshooting Guide sections, pages 17 and 99.
Typically, three separate circuit breakers are inside the start-
er. This includes (1) the VFD circuit breaker, (2) a circuit
breaker which provides power to the chiller controls and the
the oil heater (provided at 115 vac), and (3) a circuit breaker
that provides power at the line voltage to the oil pump. The
controls, oil heater and oil pump circuit breakers are wired in
parallel with the VFD circuit breaker so that power can be pro-
vided to those services when the VFD circuit breaker is open.
The circuit breaker that supplies power to the oil pump and
the circuit breaker that supplies power to the oil heater and
chiller controls are wired in parallel with the main VFD circuit
breaker so that power is supplied to them if the disconnect is
open. Refer to wiring schematic in Physical data section.
S
IDE
S
ERVICE
ACCE
SS
PANEL
AIR INTAKE
LOUVER
S
OPTIONAL ANALOG
3
-PHA
S
E
VOLTMETER AND AMMETER
S
TARTER CONTROL
DI
S
PLAY INTERFACE
VOLTMETER/
AMMETER
S
ELECTOR
S
WITCHE
S
S
TARTER
ACCE
SS
DOOR
MOTOR
POWER
DI
S
CONNECT
HANDLE
LOW VOLTAGE
ACCE
SS
DOOR
Fig. 10 — Typical Starter External View (Solid-State Starter Shown)
a19-1854
WARNING
When voltage is supplied to the solid-state circuitry (CB1
is closed), the heat sinks in the starter as well as the wires
leading to the motor and the motor terminal are at line volt-
age. Do not touch the heat sinks, power wiring, or motor
terminals while voltage is present or serious injury will
result.
WARNING
The optional main VFD circuit breaker on the front of the
VFD enclosure disconnects the VFD only. Power is still
energized for the other circuits. Two more circuit breakers
inside the starter must be turned off to disconnect power to
the oil pump, PIC II controls, and oil heater. Failure to dis-
connect power will result in personal injury.
Summary of Contents for AquaEdge 19XR series
Page 69: ...69 Fig 33 19XR Leak Test Procedures a19 1625 ...
Page 154: ...154 Fig 64 Benshaw Inc Wye Delta Unit Mounted Starter Wiring Schematic Low Voltage a19 1873 ...
Page 161: ...161 Fig 69 Typical Low Voltage Variable Frequency Drive VFD Wiring Schematic 575 v ...
Page 162: ...162 Fig 69 Typical Low Voltage Variable Frequency Drive VFD Wiring Schematic 575 v cont ...
Page 186: ...186 APPENDIX B LEAD LAG WIRING 19XR Lead Lag Schematic Series Cooler Flow a19 1655 ...
Page 187: ...187 APPENDIX B LEAD LAG WIRING cont 19XR Lead Lag Schematic Parallel Cooler Flow a19 1717 ...