Siemens RL Instruction Manual page 16

Maintenance
Table 3 Inspection and Maintenance Intervals
Inspection Interval
I
All Type RL Breakers
Frame
Check & Exercise
Size
A m p e r e s
Tripping System
Check & Exercise
Circuit Breaker Mechanism
I
Annually
800
I
1600 Annually
i
2000 Annually
3200 Annually
4000 Annually
( 1) A �y
circuit breaker which has interrupted a heavy fault current should be inspected accordi,-,g to the recommenced procedure for maintenance and lubrication.
"LM" indica:cs Low Maintenance RL Breaker produced beginning June,
•
SIEMENS
Type LM
kA Symm.
508V
635V
lnst.
---- -'- -- -- --:- -- -
S�ort Time
Brkr. W/D
I
Trip WID
L-··-· ·-····
· ·
Sensor Ratings:
----:
Current Sensors
Grd. Senso;s (when used);
Siemer,s Enetgy & A;.;t:x:oatio�.
4. Rotate the racking screw to the TEST position (ap­
proximately 3 turns) to ciear the spring discharge inter­
lock before attempting to charge closing springs.
Exercise the circuit breaker through several close-open
cycles. For electrically operated circuit breakers,
operate the circuit breaker electrically. (Refer to the
specific wiring information for your circuit breaker to
determine where control voltage signals should be ap­
plied. Usually, spring charging power is connected be­
tween secondary disconnects SD12 and SD16, closing
control power between SD13 and SD16, and tripping
power between SD11 and SD15. Secondary discon­
nects are arranged with SD1 on top, and SD16 on the
bottom). Examine the operation of the circuit breaker
during these operations for any evidence of difficulty,
erratic operation, etc.
5. Test the tripping system, using an appropriate test set.
such as the Siemens Portable Static Trip Test Set, model
PTS-4. Refer to ·static Trip Ill Information and Instruction
Guide". SG-3118 and "Portable Test Set Instructions·.
SG-3138 for information on testing. The test should in­
clude tripping of the circuit breaker by the trip device.
This confirms the functionality of the system, including
the trio device and the tripping components.
6. Clean any accum:.;lation of dust or dirt from the circuit
Maintenance & Lubrication Interval
'
RL built
before 6/ 91
(Number of operations
or time. whichever
occurs first)
1750 operations/1 year
I
500 operations/1 year
I
500 operations/1 year
250 operations/ 1 year
250 operations/ 1 year
1991.
i
Serial No.
'--- -- --
·
254V Control Voltage
Motor
Close
: - - - --- ------l
Fr. Size
:: /
·
:
-
· ··
·· ·· - ----�
Date
I
i
3068
lnst Book
SG
Raleign, NC Made U.S
Inc in A
.•
I
RL built
I
!
i
6/ 91 or later
I
(with "LM" in
I
type designation)
I
I
I
5 years
5 years
5 years
I
5 years
5 years
breaker. For insulated parts. use a clean cloth saturated
with a non-toxic cleaner. such as denatured alcohoL
7. Turn the racking screw to the DiSCONNECTED position,
and reinstall the circuit breaker in the cubicle.
Recommended RL Breaker Maintenance
and Lubrication Procedure
A suggested procedure to follow during maintenance and
lubrication sessions:
1. De-energize the primary and control circuits.
2. With the cubicle door closed, rack the circuit breaker to
the DISCONNECTED position.
3. Open the cubicle door. and remove the circuit breaker
from the cubicle.
Rotate the racking screw to the TEST
4.
proximately 3 turns) to clear the spring discharge inter­
lock. This is necessary before the closing springs can
be charged. and also makes removal of the arc chutes
easier.
5. Remove arc chutes and examine arc chutes and circuit
breaker contacts for burned, cracked. or broken parts.
To remove arc chutes, proceed as follows:
a. Remove mounting screws for holding clips, remove
bar and phase barriers.
b. Lift arc chutes vertically to clear arc runners.
6. Inspect arc chutes for excessively burned arcing plates.
Replace arc chutes under the following conditions:
a. Copper-plated steel plates in the arc chutes measure
less than 0.06" thickness for RL-800 through
circuit breakers.
b. Copper-plated steel plates in the arc chute measure
less than 0.08" thickness for RL-3200 and RL-4000
circuit breakers.
7. Wipe the contacts with a ciean cloth saturated with a
non-toxic cleaning fluid. such as denatured alcohoL
8. Replace badly ouned o� pitted contacts. (See Cc1tact
Reolace":"'ent Page 1 3,
Page 17.i Do not ilb·icate faces of contacts.
Overhaul
I nterval
All Type
RL Breakers
(Number of
operations)
12500 operations
4000 operations
4000 operations
1500 operations
1500 operations
position (ap­
RL-2000
and Lubrication Instructions,
11