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01.4IB.46300
Installation
FlexTrol
™
Class E2 Medium Voltage Controllers with
Eaton Contactor
s. s
aFety
i
nterlocks
!
WARNING
The equipment must be deenergized and
grounded prior to performing any tests or
checks of the safety interlocks described in
this section. Failure to deenergize and ground
the equipment prior to performing these tests
or checks may result in injury or death.
Before placing FlexTrol
™
into service, it is
recommended that the user is familiar with the
safety interlocks.
1) Isolating Switch Operating Handle
The isolating switch can be placed in the
ON
position by moving the operating
handle upwards to its mechanical
stop. Resistance to movement is felt
approximately ¾ through the travel from
OFF
to
ON
. This resistance force is the
making of the isolation switch blades to
their mating contacts. Do not leave the
switch with the operation handle less than
fully open or closed.
In the
ON
position a formed angle tab
projects downward from the operating
handle mechanism and engages a
latching hoop welded to the inside of the
compartment door. The engagement
of the tab in the hoop prevents the high
voltage door from being opened while the
isolation switch is in the
ON
position.
On the inside surface of the high
voltage compartment door is a small
projection located immediately above
the operating handle opening. This
projection engages a rounded pin from
the isolation switch handle mechanism
that protrudes through a clearance hole
in the enclosure immediately above the
switch handle. When this contact surface
of the compartment door depresses the
rounded pin, a mechanical catch is released
and allows the isolation switch handle to
be moved from one position to another.
This interlock prevents the isolation
switch handle from operating without the
compartment door being fully closed and
latched.
2) Door Interlocks
With the isolating switch operating handle
in the
OFF
position, the high voltage
compartment door can be opened. As soon
as the door opens, a mechanical interlock
prevents movement of the operating
handle. It is designed to prevent the user
from accidentally operating the isolation
switch handle and closing the starter on to
the line with the enclosure door open.
The mechanical interlock is a
spring-loaded lever located just behind
the door. When the door is opened,
the interlock extends and prevents the
operating handle from being placed in the
ON
position accidentally. If the user wishes
to observe the operation of the isolation
switch during installation or maintenance
procedures, this interlock must be
deliberately defeated to move the handle
to the
ON
position.
