IOMM Starter 3
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 their operating section. However, some parameters and data are
different. Where this occurs, separate tables and figures are provided.
The low voltage (200-600 volts) starters are characterized by their control software, known
as “D3 Control”. Certain electrical operating data for these low voltage starters is
transmitted to the chiller and can be viewed on the operator touch screen if the “Full
Metering Option” has been ordered. See page 27 for details.
Medium and high voltage (2300-7200 volts) starters share common software known as
“Micro II Control”, not to be confused with the McQuay MicroTech II™ chiller control
system.
Figure 1, Wye-Delta Starter
LED Display
Incomin
Lu
s
Sur
e Ca
acito
Terminal Strip
D3 Controller
Control Transformer and Fuses
Contactors
Transition Resistors
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