68 OM Centrif Micro ΙΙ-5
Low Voltage Starters, 200 – 600 Volts
This section contains information on low voltage, Wye-Delta and solid-state starters as
manufactured by Benshaw Inc. for McQuay centrifugal Chillers. They are known collectively as
“D3” starters. These low voltage starters have similar hardware and software (designated D3) and
are grouped together in this manual. Model numbers are as follows:
D3WD11 to D3WD2K Wye-Delta, Free Standing
D3WT11 to D3WT65 Wye-Delta, Factory (Terminal) Mounted
RVSS14 to RVSS4K Solid State, Free Standing
RVST14 to RVST82 Solid State, Factory (Terminal) Mounted
General
These starters are completely automatic and require no operator intervention (other than clearing
and resetting faults) to perform their function of providing a controlled connection of the
compressor motor to the power supply.
The Wye-Delta and solid-state starters have many similar software characteristics and are
discussed together in this section. However, some parameters and data are different. Where this
occurs, separate tables and figures are provided.
Certain electrical operating data in the starter is transmitted to the chiller and can be viewed on the
operator touch screen if the “Full Metering Option” has been ordered. See page 67.
Figure 36, Wye-Delta Starter
LED Display
Terminal Strip
Controller, D3
Control Transformer and Fuses
Contactors
Transition Resistors
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General
