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Starters
All starters, whether supplied by Carrier or the customer, must meet Carrier Starter
Specification Z-375. This specification can be obtained from the Carrier Sales Representative.
The purpose of this specification is to ensure the compatibility of the starter and the machine.
Many styles of compatible starters are available, including solid-state starters, autotransformer,
wye-delta closed transition starters, and full voltage starters.
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Definitions
Analog Signal
An analog signal
varies in proportion to the monitored source. It quantifies values between
operating limits. (Example: A temperature sensor is an analog device because its resistance
changes in proportion to the temperature, generating many values.)
Digital Signal
A digital (discrete) signal
is a 2-position representation of the value of a monitored source.
(Example: A switch is a digital device because it only indicates whether a value is above or
below a set point or boundary by generating an on/off, high/low, or open/closed signal.)