©2008 Ingersoll Rand Company Page 12
controller will shut the unit down on a (code 20)
Main motor Over Temp alarm.
Digital Outputs
All digital outputs are connected to terminal XO3
on the back of the controller.
1M / 2M Starter Contacts [Std] – YΔ Logic
uses two digital contacts on one common
output. The S3 controllers start and run logic
remains the same but the 2M output is not used
for the starters. A normally closed electrical
interlock (KMS-3) from 1S (KM3) contactors
keeps the 2M (KM2) contactor from energizing
anytime the 1S contactor is energized. Electrical
interlocks are wired such that when the 1S
(KM3) output is de-energized at Star Delta
transition time causing the 1S (KM3) contactor
to open, the 1S normally closed interlock (KM3-
2) falls back to the closed position energizing the
2M (KM2) contactor. A second electrical
interlock from 1S (KM3) contactor is wired in
series with 1M (KM1) contactor to ensure the 1S
(KM3) is pulled in before 1M (KM1) will be
energize. An interlock from 1M (KM1) contactor
is used to seal around the 1S (KM3-1) contact to
allow the 1M (KM1) contact to remain energized
when the 1S (KM3) contact is de-energized at
the Star Delta transition.
1S Starter Contact [Std] – This contactor is
only installed and used in the YΔ type of starter.
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