15
Instruction Booklet
IB022018EN
Effective July 2020
Instructions for the installation and
EATON
www.eaton.com
Figure 14. 3PDS manual operation T-handle.
NOTICE
DURING MANUAL OPERATION, THE THREE POSITION DISCONNECT
SWITCH HAS NO SCREW DRIVE TRAVEL MECHANICAL LIMITS. IT CAN
BE MOVED INTO OVERTRAVEL POSITIONS AT BOTH ENDS OF TRAVEL
(GROUND AND CLOSED).
DO NOT MOVE THE SCREW DRIVE BEYOND ITS END OF TRAVEL
INDICATIONS, AS THAT CAN RESULT IN DAMAGE TO THE SCREW DRIVE
MECHANISM. USE THE THREE POSITION DISCONNECT SWITCH STATUS
DISPLAY WINDOWS TO DETERMINE WHEN THE THREE POSITION
DISCONNECT SWITCH HAS REACHED THE DESIRED LOCATION.
Figure 15. Disconnect switch windows and label.
In order to ground the output cables or coupling bus, the 3PDS must
be put in the ground position and the circuit breaker must be closed.
The 3PDS screw drive also propels a cam limit switch mounted
inside the operating mechanism. This cam limit switch has four
contacts. The contacts are used in the electric control system to
signal 3PDS status: closed, opened and grounded.
The 3PDS and circuit breaker are mechanically and electrically
interlocked to prevent inappropriate operation.
Figure 16. 3PDS chain drive.
A mechanical display provided on front of the 3PDS operating
mechanism face plate indicates the switch position status as shown
in
Figure 17. 3PDS (normal operation).