Instruction manual

KRB-5377
78
6-1. Inspection Procedures
CAUTION
z ACB maintenance, inspection and parts replacement must be performed by competent persons.
z Do not touch ACB current carrying parts and ACB structural parts close to a current carrying part immediately after the ACB
trips open. Remaining heat may cause a burn.
z Prior to commencing any work on the ACB, open an upstream circuit breaker or the like to isolate all sources of
power/voltage from the main and control circuits. Otherwise, electric shock may result.
z Take care to avoid adhesion of dust to main and control circuit contacts. Dust on the contacts may result in a fire.
z Prior to commencing maintenance, inspection, or parts replacement, make sure that the closing springs are released and the
ACB is open. Otherwise, unintentional open/close operation may lead to fingers or tools to be pinched by the open/close
mechanism, resulting in injury.
z Retighten the terminal screws periodically to the specified torque. Otherwise, a fire could result.
z When grinding a contact tip, be careful to prevent grinding dust from entering the breaker operating mechanism. Wipe the tip
clean after grinding. Otherwise, a malfunction or fire could result.
z Do not perform dielectric withstand/insulation resistance tests under other conditions than specified. Doing so may cause a
malfunction.
z Be sure to reinstall the arc chamber if removed. Failure to do so or incorrect installation of the arc chamber may result in a fire
or burn.
z When charging the closing springs or performing open/close operation of the ACB with the arc chamber, front cover and/or
side covers removed during maintenance or inspection work, do not touch parts other than those required for the above
operation (charging handle, ON/OFF buttons, moving core and the like). Doing so may cause fingers or tools to be pinched,
resulting in injury.
z When replacing an auxiliary, do not damage the control wire for the auxiliary or pinch the wire between the auxiliary and the
breaker body. Doing so may cause a malfunction.
To ensure safety, be sure to perform the preparation work described in section 6-2-1 unless otherwise specified in the inspection
procedures. The normal inspection procedure and the detailed inspection procedure are shown in Tables 42 and 43 respectively.
z Information you are requested to state
If you want us to take action against an abnormality, contact us while providing us the information shown in Table 41 below. Our
contact is shown at the end of this manual.
Table 41 Information you are requested to state
Item Description Reference
Type AR_____ __ __ poles with draw-out cradle
Serial No. __________ – ______
Rating nameplate
Main circuit rated current  AC  DC _____V Product Specifications
Rated voltage ______A
I
n
Spring charging method
 Manual charging  Motor charging
Rated operation voltage:  AC  DC _____V
CLOSING section on
specification nameplate
Overcurrent release
 Non  Equipped Type: AGR-____ – _______
Rated control voltage:  AC  DC _____V
OCR section on
specification nameplate
Electrical tripping device
 Shunt trip device (SHT) Rated voltage:  AC  DC _____V
 Undervoltage trip device (UVT) Rated voltage:  AC  DC _____V
TRIPPING section on
specification nameplate
Special specification SR: ________ SS: ________ SO: ________
OTHERS section on
specification nameplate
Working conditions
(Voltage, current,
environment)
-
Symptom of abnormality (in
detail): When, How, Where,
etc.)
-
Inspection done/actions
taken (if any)
6-1.
Status quo and schedule
Permissible power cut date and time: ____________________
Place where you want us to take action: ____________________
-
z The contents of the nameplate should be provided in detail.
z Related documents such as product specifications and inspection reports should be provided.
z If you have a desired inspection and maintenance schedule, let us know the schedule at your earliest convenience. Our service representative could not meet your last minute
requirement.