APC Automatic Disconnect Switch Specifications download pdf (Page 17)

Overview: How the InfraStruXure Power Generation System Operates

Automatic Transfer Switch with Power Distribution 7

Generator start sequence

The generator start sequence is followed only if the Crank setting in the Operating Settings menu

on the Generator Settings screen on the ATS display interface menu is set to Yes. If it is enabled, the

following sequence will occur:

After a start signal is initiated, either by the ATS or manually, and the generator battery is good, the

generator engine will crank and the generator should start. If the generator does not start, it will crank

for the length of the Crank Time, and then rest for the length of the Rest Time. The generator will

repeat this pattern for the number of times set in the Crank Cycles before stopping the attempt to

start. Check the messages on the display interface for reasons why the generator did not start.

On the generator controller interface, the LEDs track conditions during the start sequence:

Generator cool-down

After the load is powered by the generator, and the utility mains returns and is powering the load, the

generator may enter a cool-down period. If the coolant temperature is above the Coolant

Temperature Limit, the generator will enter a cool-down period. During generator cool-down, the

generator disconnects the alternator from the output and then runs at idle speed for 10 minutes. After

the idle speed time expires, the generator will shut down. If the coolant temperature is not above the

Coolant Temperature Limit, the generator will not enter a cool-down period but will shut down

after the utility mains returns and is powering the load.

LED Behavior on the Generator Controller Interface

Start sequence initiated: Generator Started: Generator Failed to Start:

1 2 ... 12 13 14 15 16 17 18 19 20 21 22 ... 101 102

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APC Automatic Disconnect Switch Specifications Page 17