SECTION 3 BYPASSING & ISOLATING

Figure 3–1. Status lights and Engine Control.

BYPASSING THE ATS*

This procedure explains how to Bypass the closed transfer switch contacts. Bypassing is required before the Transfer Switch can be tested or isolated. The Bypass Switch Handle must be in the OPEN position (green window indicator) and the Isolation Handle must be in the CONN [connected] position (window indicator). The TS Connected light must be on. See Figures 3–1, 3–2, 3–3.

You can only bypass to the same source that the Transfer Switch is connected.

Solenoid interlock prevents incorrect operation.

1.Observe which Transfer Switch Connected To light is on (Normal or Emergency) on the door. This is the position of the transfer switch (see Figure 3–2).

2.Follow the directions on next page to Bypass to the same source as connected to transfer switch (select Normal or Emergency).

Window indicator shows yellow when ATS is bypassed to Emergency.

Window indicator shows green when the ATS is not bypassed.

Upper green light is on if Transfer Switch is on Normal.

Lower red light is on if Transfer Switch is on Emergency.

TRANSFER SWITCH

CONNECTED TO NORMAL

CONNECTED TO EMERGENCY

Window indicator shows yellow when ATS is bypassed to Normal.

Figure 3–4. Bypass Handle and three position window indicators.

Figure 3–2. Status lights for Transfer Switch main

contact position.

Upper amber light

TS CONNECTED

should be on.

TS TEST

 

 

TS ISOLATED

Figure 3–3. Status lights for Transfer Switch isolation

contact position.

NOTE: The 7ATB contains mechanical (window) indicators for the bypass switch and transfer switch positions in addition to the LED status lights.

Allowable Positions of the Bypass Switch in relation to Positions of the Transfer Switch (with Isolation Handle in the Conn [connected] position and TS Connected light on)

Transfer Switch

Bypass Switch

can be in either

 

If Transfer Switch is in

Open or

Normal

Normal position.

 

 

If Transfer Switch is in

Open or

Emergency

Emergency position.

 

 

 

 

 

3---1

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Emerson 7ADTB manual Bypassing & Isolating, Bypassing the ATS, Upper amber light, Should be on, Bypass Switch
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7ADTB specifications

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