Starting Equipment; Solid-State Starter (Optional); Free-Standing Medium Voltage Vfd (Optional) - Carrier AquaEdge 19XR Start-Up, Operation And Maintenance Instructions Manual

STARTING EQUIPMENT

The 19XR chiller requires a motor starter to operate the centrif-
ugal hermetic compressor motor, the oil pump, and various
auxiliary equipment components. The starter is the main field
wiring interface for the contractor.
See Carrier's specification for specific starter requirements. All
starters must meet these specifications in order to properly start
and satisfy mechanical safety requirements.
It is possible that there are two separate circuit breakers inside
the starter. These include (1) the main compressor motor cir-
cuit breaker, and (2) a circuit breaker which provides power to
the chiller control panel. The latter is typically wired in parallel
with the first so that power is provided to those services when
the main breaker is open. The disconnect switch on the starter
front cover is connected to the main breaker. Typically, sepa-
rate 3-phase power sources as per job requirements are sup-
plied to the control panel to power the oil pump, heater, and
controls.
WARNING
The main circuit breaker on the front of the starter discon-
nects the main motor power only. Power may be still ener-
gized for other circuits. Always check wiring diagrams be-
fore initiating any work on the chiller and follow applicable
lock-out/tag-out procedures. Failure to disconnect power
will result in personal injury.
All starters must include a Carrier control module called the In-
tegrated Starter Module (ISM). This module controls and mon-
itors all aspects of the starter. See the Controls Operation and
Troubleshooting guide for additional ISM information. Contact
Carrier's Replacement Component Division (RCD) for re-
placement parts. Current standard North America starter types
are Across the Line, Solid-State, Auto-Transformer, and VFD
(variable frequency drive).

Solid-State Starter (Optional)

The 19XR chiller may be equipped with a solid-state, reduced-
voltage starter. This starter's primary function is to provide on-
off control of the compressor motor. This type of starter reduc-
es the peak starting torque, controls the motor inrush current,
and decreases mechanical shock. This capability is summed up
by the phrase "soft starting." Consult E-Cat for full informa-
tion about starter offerings. The solid-state starter manufactur-
er's name is located inside the starter access door.
A solid-state, reduced-voltage starter operates by reducing the
starting voltage. The starting torque of a motor at full voltage is
typically 125% to 175% of the running torque. When the voltage
and the current are reduced at start-up, the starting torque is re-
duced as well. The object is to reduce the starting voltage to ad-
just the voltage necessary to develop the torque required to get
the motor moving. The voltage is reduced by silicon controlled
rectifiers (SCRs). The voltage and current are then ramped up in
a desired period of time. Once full voltage is reached, a bypass
contactor is energized to bypass the SCRs.
When voltage is supplied to the solid-state circuitry (CB1 is
closed), the heat sinks in the starter as well as the wires lead-
ing to the motor and the motor terminal are at line voltage.
Do not touch the heat sinks, power wiring, or motor termi-
nals while voltage is present or serious injury will result.
The display on the front of the solid-state starter 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 section,
page 19.

Free-Standing Medium Voltage VFD (Optional)

For optimum efficiency, the 19XR chiller can be combined
with a VFD. This option is a free-standing, medium voltage
current source drive that does not require a transformer be-
tween the power source and the drive. The drive meets IEEE-
519 specifications.
10
WARNING