Cooper Lighting S260-75-1 - Manual (Page 8)

Customer Connections
Connection Diagram
Diagrams for interconnecting the load-transfer control
with the high-voltage switches and potential transformers
are shown in Figures 5 through 8. The diagrams show
the internal wiring between the terminal blocks and the
input and output receptacles on the control (available as
an accessory) and the external wiring between the con-
trol, transfer switches, and potential transformers. If the
control is not equipped with the plugs and receptacles
accessory, the cables are wired directly to the terminal
blocks in the control. For the physical location of terminal
blocks, refer to Figure 27.
Note: Internally wired receptacles and mating plugs for the
switch operators and current sensing transformers on
the switch end of the cables are provided as standard
with the switches.
Type S Automatic Load-Transfer Control Installation, Operation, and Maintenance Instructions
8
* Assuming no feedback from the load
** Bank operates open wye-delta; requires two primary phases open for sensing
† Voltage may vary from 87 to 58% depending on load
LOAD
H.V.
SWITCH H.V.
SWITCH
S
CONT
B
C D A
FEEDER SOURCE
%
Phase Voltage at the Three-Phase Sensing Type S Load Transfer Control as Related to System and Sensing Transformer Connections
Figure 4.
Phase voltage at the three-phase sensing Type S load-transfer control.
CAUTION: Equipment Damage. Do not drill connec-
tion holes into the top of the cabinet. Connection holes in
the top of the cabinet will allow moisture to seep into the
control and damage the components or cause control
misoperation. Failure to comply will void the control’s fac-
tory warranty.
T249.0