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ATS (Automatic TransformerSwitch)

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Prepared & Presented by

Eng. Mohamad Koubeissi (Head of the Design Department)

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- Type and Operation of ATS

- ATS G/M

- ATS G1/G2

- Break

- ATS G1/G2/M

- Digital ATS

- Problems and possible causes

- Questions

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Type and operation of ATS

There are 3 types of ATS

A- ATS G/M: This type is installed when the Mains electricity is available and the Gen-Set works as standby source.

Operation: ATS monitors the Mains supply. When the Mains fails, the ATS starts, the Gen-Set the load is engaged after warm-up

period. As soon as the Mains supply is available, the power is switched back after a restoration delay and the Generator shuts down

after a certain cooling time without being in load.

B- ATS G1/G2: This type of ATS is installed when the Mains electricity is completely absent and the 2 Gen-Sets work as Main

source.

Operation: G1 is running on load and when the time of the Generator on load comes to the end, the stand-by Generator willautomatically starts and after warm-up period takes the load, then the first Generator stops after a certain cooling time and the cycle

continues according the adjustable cycle time.

In case the requested Generator fails to start or shuts down due to any fault, the stand-by Generator will automatically start and

supply load until fixing the problem of the first one.

C- ATS G1/G2/ M: This type of ATS is installed when the Mains electricity is available but during short time and the 2 Gen-Sets work

as standby source.

Operation: The ATS monitors the Mains supply. When the Mains fails, the ATS starts G1 or G2 depending on the cycle timer. Load is

engaged after warm-up period. As soon as the Mains supply is available, the power is switched back and the Generator shuts downafter a certain cooling time without being in load.

When the time of the Generator on load comes to the end, the stand-by Generator will automatically starts and after warm-up period

takes the load, then the first Generator stop after a certain cooling time and the cycle continues according the adjustable cycle time.

In case the requested Generator fails to start or its contactor fails to engage or shuts down due to any fault, the stand-by Generator

will automatically start and supply load until fixing the problem of the first one.

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ATS G/M

Mains contactor

Gen-Set contactor

OUV relay

Timer 24 hours

Relay 220VAC Timer 220VAC

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ATS G1/G2

G1 contactor

G2 contactor

Timer 24 hours

Relay 12VDC

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ATS G1/G2/MTimer 24 hours

Timer 220VAC

OUV relay

Mains Contactor

Common Contactor

G2 Contactor

G1 Contactor

Relay 12VDC

Relay 220VAC

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ATS G1/G2/M

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ATS G1/G2/M

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ATS G1/G2/M

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Digital ATS G/M, G1/G2, G1/G2/M

Digital Unit

Mains Contactor

Common Contactor

G2 Contactor

G1 Contactor

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Major Problems and possible causes

Mains is available but Gen-Set is running - OUV relay

Mains is absent but the Gen-Set doesnt start - AUTO mode

- Relay RE

Gen-Set is alive but there is no electricity on Load - Mains contactor auxiliary

- Gen-Set solenoid contactor

- Contactor line from Gen-Set Panel

Mains is available but there is no electricity on load - OUV relay

- Gen-Set contactor auxiliary,

- Mains solenoid contactor

ATS G/MProblem cause

Gen-Sets dont alternate - Relays TS, RTS, RT

G1or G2 is alive but there is no electricity on load -Contactor auxiliary and solenoid

- Contactor line from Gen-Set panel

Fault on G1 but G2 doesnt start - Signal coming from relay RA

Miss-connection of electrical inter-lock - Electrical interlock connection

ATS G1/G2Problem cause

ATS G1/G2/M :Same as G/M + G1/G2

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Questions ?