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BYPASSING & ISOLATING
(continued)
3--2
TRANSFER SWITCH REMOVAL
This procedure explains how to remove the Transfer
Switch for inspection and maintenance.
1. Bypass and Isolate the Automatic Transfer Switch by
carefully following directions on page 3–1. Be sure
that the ATS POSITION D ISCONNECTED light is
on. Then remove the Isolation Handle.
Hazardous voltage capable of causing
electrical shock, burns, or death.
Do not touch isolation contact fingers.
2. Open the AT S cabinet doors all the way. Remove the
bottom louvered enclosure pan.
3. Separate the in–line disconnect plugs (P2 and P5) by
grasping and squeezing the plugs. Do not pull on the
harness wires.
4. Remove the Transfer Switch from the enclosure:
The enclosure tracks andf loor in front must be free of
debris. Grasp the Transfer Switch carriage frame and
roll it out of the enclosure. See Figure 3-6.
Figure 3-6 Transfer Switch removed.
5. Close the cabinet doors.
TRANSFER SWITCH REINSTALLATION
This procedure explains howto installthe Transfer Switch
afte r inspection and maintenance.
Hazardous voltage capable of causing
electrical shock, burns, or death.
Do not touch isolation contact fingers.
1. Open the AT S cabinet doors all the way. Remove the
bottom louvered enclosure pan (if not already
removed).
All arc chutes and interphase barriers must be in
place on the Transfer Switch. The enclosure
tracks and floor in front must be free of debris.
!
The Transfer Switch contacts must be c losed
onthesamesourcethatisfeedingtheload
(use the maintenance handle – see page 1–6).
!
NOTE: BesuretoinstallthecorrectTransfer
Switch into the enclosure. If more than one is
supplied, each will be labeled.
2. Install the Transfer Switch i nto the enclosure:
Grasp the Transfer Switch carriage frame and
roll it into the enclosure (isolation contacts
facing inward). Align the rollers between the
floor guides and push the carriage in until its
crank pins engage the latch plates on both
sides.
3. Reconnect the in---line disconnect plugs by grasping
and pressing them together. Be sure to connect the
correct p lugs.
4. Close the cabinet door and install the enclosure pan.
5. Install the Isolation Handle. Carefully follow
directions on page 3–3 to put the Isolation Handle in
the TEST position, then the CLOSED position.
Finally, follow directions on page 3–3 to put the
Bypass Handle in the AUTOMATIC POS (position).