GE Entelli-Switch 250 User Manual download pdf (Page 24)

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24 GE Zenith Controls

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Entelli-Switch 250 Operation and Maintenance Manual (71R-2000)

Sequence of Operation

Standard Transition

Source 1 Power Failure:

When Source 1 voltage or frequency has fallen below

the preset "Fail" values, the controller initiates the Time

Delay Source 2 Start Timer (Engine Start Timer "P")

cycle. Upon completion of the (P) time delay, an

Engine start Signal is sent to Source 2. When Source 2

voltage and frequency reach the preset "Restore" Values,

the time delay to Source 2 Timer (W) begins its timing

cycle to ensure voltage and frequency stabilization

before transfer. A manual pushbutton BYPASS is provid-

ed to bypass the "W" time delay if desired. After the (W)

time delay, the CCE relay energizes the CE solenoid to

close the transfer switch in to Source 2. The SE limit

switch activates to de-energize the CCE relay.

Restoration of Source 1 Power:

When Source 1 power reach the preset "Restore" values,

the controller initiates re-transfer to Source

1sequence.The delay to Source 1 Timer (T) begins its

timing cycle to ensure voltage and frequency stabiliza-

tion before retransfer. A manual pushbutton BYPASS is

provided to bypass the "T" time delay if desired. After

the (T) time delay, the CCN relay energizes the CN

solenoid to retransfer the switch to Source 1. The SN

limit switch activates to de-energize the CCN relay.

Immediately after re-transfer, the S2 Stop Delay Timer

(Delay to Engine Stop "U") begins its cycle to allow

Source 2 Engine to run unloaded. A manual pushbut-

ton BYPASS is provided to bypass the "U" time delay if

desired. Upon completion of the (U) timing cycle, the

controller sends an Engine stop signal.

Delayed Transition

Source 1 Power Failure:

When Source 1 voltage or frequency has fallen below

the preset "Fail" values, the controller initiates the

Time Delay Source 2 Start (Engine Start Timer "P")

cycle. Upon completion of the (P) time delay, an

Engine start Signal is sent to Source 2. When Source 2

voltage and frequency reach the preset "Restore" values,

the time delay to open Source 1 timer (W) begins its

timing cycle to ensure voltage and frequency stabiliza-

tion before re-transfer. A manual pushbutton BYPASS is

provided to bypass the "W" time delay if desired. After

the (W) time delay, the CCNO relay energizes the CNO

solenoid to open the transfer switch out of Source 1

position. The time delay to Source 2 timer (DW) begins

its timing cycle. After the (DW) time delay, the CCE

relay energizes. The switch then completes transfer to

Source 2 by energizing the CE solenoid. The SE limit

switch activates to de-energize the CCE relay.

Restoration of Source 1 Power:

When Source 1 power reach the preset "Restore" values,

the controller initiates re-transfer to Source 1

sequence.The delay to open Source 2 Timer (T) begins

its timing cycle to ensure voltage and frequency stabi-

lization before retransfer. A manual pushbutton BYPASS

is provided to bypass the "T" time delay if desired. After

the (T) time delay, the CCEO relay energizes the CEO

solenoid to open the switch out of Source 2 position.

The time delay to Source 1 timer (DT) begins its timing

cycle. After the (DT) time delay, the CCN relay ener-

gizes the CN solenoid to complete re-transfer of the

switch to Source 1. The SN limit switch activates to de-

energize the CCN relay.

Immediately after re-transfer, the S2 Stop Delay Timer

(Delay to Engine Stop "U") begins its cycle to allow

Source 2 Engine to run unloaded. A manual pushbut-

ton BYPASS is provided to bypass the "U" time delay if

desired. Upon completion of the (U) timing cycle, the

controller sends an Engine stop signal.

Timer Designations as they appear in the SET menu

ATS Type P W DW T DT U

Standard Time Delay Time Delay Time Delay S2 Stop

Transition S2 Start S2 Stable S1 Stable Delay

Delay/ Open Time Delay Time Delay ATS Open Time Delay ATS Open S2 Stop

Transition S2 Start S2 Stable Time to S2 S1 Stable Time to S1 Delay

Source 1 Transfer to Source 2

Source 1

Transfer to Source 1 Engine

Fails

Returns

Cooldown

Table 3

1 2 ... 19 20 21 22 23 24 25 26 27 28 29 30 31 32

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GE Entelli-Switch 250 User Manual Page 24

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