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IB140012EN
Instructional Booklet
Page
42
Effective: March 2021
Operation and Maintenance Manual,
Automatic Transfer Switch Controller, ATC-900
YELLOW BAR FLASHING MESSAGES
1
Overvoltage
Indication of Overvoltage (not withing setpoint setting)
2
Undervoltage
Indication of Undervoltage (not withing setpoint setting)
3
Underfrequency
Indication of Underfrequency (not withing setpoint setting)
4
Overfrequency
Indication of Overvoltage (not withing setpoint setting)
5
Voltage Unbalance
Indication of Voltage Unbalance
6
Phase Loss
Indication of Phase Loss
7
Phase Reversal
Indication of Phase Reversal
8
Plant Exerciser
Indication of switch currently in the Exerciser mode
9
Monitor Mode
Automatic control is disabled but still monitors source status
10
Go To Emergency
The switch is commanded to go to the Emergency position
11
Emergency Inhibit
The switch is commanded to go to Emergency Inhibit or Load Shed
12
Go To Neutral
The switch is commanded to go to Trip or to the Neutral position
13
In Automatic Bypass
The switch is in Bypass
14
Secondary Inactive
Controller is configured as a Secondary and the Secondary In signal is inactive
15
Safety Interlock - Transfer Inhibited
Bypass Door Open, Contactor(s) Not Locked in, in Monitor Mode.
16
Closed Transition Disabled
The switch is commanded to perform only open transitions.
Timer Countdown Bar
1
Time Delay Engine Start
Countdown timer before generator contacts are closed
2
Time Delay Normal Disconnect
Countdown timer for when Source 1 is not available to switch to neutral.
3
Time Delay Normal to Emergency
Countdown timer before normal is opened for transfer to emergency source
4
Time Delay Normal Reconnect
Countdown timer for when Source 1 is available to switch back to source 1.
5
Time Delay Emergency Disconnect
Countdown timer for when Source 2 is not available to switch to neutral.
6
Time Delay Emergency to Normal
Countdown timer before emergency is opened for transfer to normal source
7
Time Delay Emergency Reconnect
Countdown timer for when Source 2 is available to switch back to source 2.
8
Time Delay Engine Fail
Countdown timer before engine source is declared unavailable.
9
Time Delay Neutral
Countdown timer with both sources disconnected from the load (Trip)
10
Sync Timer
Countown timer while waiting for sources to synchronize for a transition
11
Pretransfer Timer
A notice prior to the transferring of the load
12
Posttransfer Timer
A notice after the transferring of the load
13
S1 Unbalance Timer
Timer to indicate S1 Unbalanced (not withing setpoint setting)
14
S2 Unbalance Timer
Timer to indicate S2 Unbalanced (not withing setpoint setting)
15
Waiting for S1 Generator
Waiting on S1 Generator to become available (voltage and Frequency)
16
Waiting for S2 Generator
Waiting on S2 Generator to become available (voltage and Frequency)
17
Engine Run Timer
Countdown timer of the engine test
18
Time Delay Engine Cooldown
Countdown cool off timing before generator contacts are opened
19
Waiting for Manual Re-Transfer
Waiting on an input contact closure to complete the manual re-transfer
20
Load Sequence Timer(s)
Not on the yellow bar but underneath but still on the timer countdown screen. Named dependent on I/Os and I/O Modules used.