TERASAKI TemPower2 AR-E Series, Instruction Manual

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KRB-5368c
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
Operation Precautions (continued)
CAUTION
 Repeated open/close operation by the motor charging mechanism without pause should not exceed 15 times. If repeated
continuous open/close operation is inevitable, a pause of at least 20 minutes should be provided after the repetitions of 15
times. Otherwise, a spring charging motor may be burnt out.
 Do not bring your hand or face close to arc gas vent of the arc chamber while the ACB is closed. Otherwise, a burn may result
from high-temperature arc gas blowing out of the arc gas vent when the ACB trips open.

If the ACB trips open automatically, remove the cause of tripping operation before re-closing the ACB. Otherwise, a fire
could result.

OCR (Overcurrent Release) Handling Precautions
CAUTION

OCR setting changes must be performed by competent persons.

After setting changes are made, the settings be checked with e.g., a type ANS2S OCR test interface unit (optional).

After completion of OCR tests, be sure to return the settings to the original values. Failure to do so may cause a fire or
burnout.

Before changing OCR settings, open the ACB and then lock the OFF button to prevent the ACB from being closed
inadvertently.
 Use a small flatblade screwdriver with a torque of not more than 0.1 N·m or a force of not more than 0.1 N when adjusting the
setting switches (rotary step switches or slide switches). An excessive torque or force may cause a malfunction.

Maintenance and Inspection Precautions
CAUTION

ACB maintenance, inspection and parts replacement must be performed by competent persons.
 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.

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..
 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.
 Retighten the terminal screws periodically to the specified torque. Otherwise, a fire could result.

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.

Do not perform dielectric withstand tests under other conditions than specified. Doing so may cause a malfunction.
 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.

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.
 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.