4
Instructional Booklet
IB013003EN
Effective June 2023
Instructions for installation, operation,
and maintenance of Magnum MR2
(integral racking)
EATON
www.eaton.com
Permissive interlocks
Operational interlock features
There are multiple permissive interlock features built into the
system . These features, when activated, will prevent electrical
racking and display an E5 error code on the pendant . See
Diagnostics/troubleshooting section for more information . There are
three standard permissive interlock switches wired in a single circuit
for every breaker with integral racking .
Breaker specific interlocks
1.
Permissive switch driven by the breaker mechanism to indicate if
the breaker is open or closed .
a.
If the circuit breaker is closed, this switch will open and the
integral racking motor will not run .
2.
Permissive switch driven by the racking mechanism door to
indicate if the door is raised or lowered .
a.
If the racking mechanism door is raised, this switch will open
and the integral racking motor will not run .
3.
Permissive switch driven by the padlock slider to indicate if the
levering mechanism is locked out .
a.
If the padlock slider is pushed in towards the levering door,
this switch will open and the integral racking motor will not
run .
In addition to the permissive contacts mentioned above, the
controller will accept any additional normally closed permissive
contacts wired in series with the blue permissive wires shown (see
Figure 6) .
Figure 6. MR2 controller.
Restricting operation
Using the MR2 system, there are three methods to restrict racking a
Magnum circuit breaker .
Option 1 (lockout-tagout): This option prevents both electrical and
manual operation . Push the padlock slider forward (towards the
breaker) aligning two holes on the left side and insert a ¼” padlock
(see Figure 7) . The MR2 will be disabled via the permissive circuit,
and manual racking is blocked as well . The label on the levering door
will show red, indicating that no racking is permitted . For a multi-
lock hasp, Eaton recommends Master Lock 418 with a ¼” diameter
shackle .
Figure 7. Padlock slider permissive actuated (no racking allowed).
Option 2: This option prevents electrical operation . Raise the
racking door and insert a ¼” padlock in the upper padlock hole . This
will keep the door raised, and permits a user to manually insert a
levering tool, allowing breaker racking . The MR2 will be disabled
via the permissive circuit and electrical racking will be blocked (see
Figure 8) . Note that the breaker cannot be closed while in this state .
For a multi-lock hasp, Eaton recommends Master Lock 418 with a
¼” diameter shackle .
Figure 8. MR2 racking prevent-
ed (manual racking allowed).
Figure 9. Door lifting is
blocked (MR2 racking
allowed).
Option 3: This option prevents manual operation . Inserting a sealing
wire through the holes on the right side of the padlock slider and
racking door prohibits a user from lifting the door . This prevents a
user from inserting a levering tool and racking manually, but allows
electrical operation (see Figure 9) . A user can break the wire seal for
manual racking in an emergency . The padlock slider can be pushed
in to lockout all racking while sealing wire is installed (refer to
Option 1) .
Refer to equipment instruction booklet for acceptable LOTO options .
