RRS-3 WL
Installation and Operation
7
A
TTENTION
!
When the breaker reaches either the test or disconnected position the torque will rise as vari-
ous interlocks and mechanical limits engage. Do NOT apply any torque to the racking mecha-
nism greater than that seen during the racking process.
4.
Next, reset the torque wrench (if needed) and proceed to rack the breaker in, again measuring the
maximum torque applied. Record this value.
A
TTENTION
!
As you begin racking the breaker onto the stabs the torque should raise, and then almost
immediately after the breaker is on the stabs the torque will lower and then spike as you hit
the racking limits. This spike is the breaker starting to be racked in too far. DO NOT continue
to rack in the breaker at this point. The maximum amount of force the breaker needs to rack
will be found as breaker has gone onto the stabs
D
ANGER
!
As breakers age and/or do not see regular maintenance the torque needed to rack a breaker
may increase. However, large increases of torque needed to rack a breaker including amounts
over 10% of the average torque may indicate breaker problems, which could lead to an arc
flash.
If the RRS does not seem to have enough torque, first double check that the breaker is operat-
ing properly before racking out by hand.
5.
Take the the higher of the two recorded values and multiply by 1.1. This adds an additional 10%
margin of error for the torque limiter. This new value is the setting for the torque limiter.
6.
Next, Attach the torque wrench to the spring loaded drive head (Various different socket adapters
may be necessary depending on the drive size of the torque wrench) and use the torque wrench to
determine the present setting of the torque limiter. The torque limiter body will need to be held still
during this operation.
7.
Remove the snap ring and locking plate from the torque limiter.
8.
Adjust the nut clockwise to increase torque, and counter-clockwise to decrease torque.
9.
Obtain a new torque reading with the torque wrench to verify the new torque setting. Repeat steps
8-9 until the torque value determined in step 5 is reached.
10.
Replace the locking plate and snap ring onto the torque limiter.
D
ANGER
!
Inaccurate setting of the torque limiter may result in excessive slip during racking operations
or, if over-tightened, the remote rack placing excessive torque on the breaker racking mecha-
nism; possibly leading to equipment damage.
Summary of Contents for RRS-3 WL
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Page 13: ...RRS 3 WL Installation and Operation 11 Notes...
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