Specifications

7
Safety Precautions
Indicator Line-up,
Precautions & Specifications
5. Usage precautions
Please conform to the following during use.
6. Precautions concerning repair/response in case of failure/abnormality
If an abnormal noise or heat is generated or a failure occurs, take immediate measures such as shutting off the input, and
contact the nearest Mitsubishi Electric System & Service Co. Ltd. branch or relevant Mitsubishi Electric branch.
7. Maintenance and inspection
Perform the following inspections to ensure correct use of indicators.
z Daily inspection
Check for the following:
· Damage to the indicator
· Abnormal functioning
· Abnormal noise or odor
· Presence of debris, dust or water
x Periodic inspection
In addition to the above items, check for the following:
· Loose mounting or loose terminal wire connections
· Overheating or deformation due to stress to terminals, outer casings or other components.
(1) The cover has an antistatic treatment; please follow these precautions when cleaning it.
· Wipe the cover surface with a soft cloth to remove any dust/dirt. If the dust/dirt cannot be removed, the cover should be
replaced.
· To prevent cover deformation or discoloration, or peeling of the cover coating, do not use benzene, thinner or similar
cleaning agents on the cover and avoid placing any type of chemically-treated cloth on the cover for a long period of time.
· Static electricity can cause unstable needle movement. If this happens, it may be necessary to coat the cover with a
commercially available antistatic agent.
(1) Use within the rated range. Use outside of the rated range may cause malfunction or failure.
· Applying an electric current exceeding the rated value may cause a failure. Note that this excludes
certain models (AC ammeters with expanded scales), for which a temporary current (less than one
minute at three times the rated value) may be applied.
· With the LM-11MRN, LM-11MRHN, LR-11MRN, and LR-11MRHN meter relays, when interruption of the
auxiliary power supply occurs, the contact output state immediately before interruption is memorized.
Thus, depending on the state during recovery from interruption, the contact output may be abnormal.
After recovery from interruption, to return the indicator to normal operation, perform the resetting
operation after moving the setting needle past the driving needle using the setting knob (see p.90 of this
catalog for details).
· With the LM-11ZN and LM-11YN indicators with maximum and minimum needles, LB-8ZN, LB-11ZN,
LB-11YN, LB-11ZRN, and LB-11YRN demand meters, and LB-11ZRMN demand meter relay, set the
current application time of the electromagnetic remaining needle resetting terminal to “within 5
seconds.” Burnout will occur if current application is continued for 5 seconds or longer.
(2) If, when using a movable iron-core indicator by connecting it to the output side of an inverter, the carrier
frequency of the inverter is set higher than 5kHz, the indicator may generate heat and failure may occur.
Use a carrier frequency of 5kHz or less.
(3) The upper-limit alarm and lower-limit alarm settings of the meter relay and demand meter relay must be
set correctly. If the settings are incorrect, an alarm will not be generated when an alarm is needed.
(4) A shunt (SHT) generates heat and must not be touched by bare hands as it will cause a burn.
Additionally, select a well-ventilated location for installation and mount the unit giving consideration to
heat radiation. (Refer to p.47 of the catalog.)
(5) Do not remove or modify the cover of an indicator, otherwise failure, electrical shock or fire may occur.
CAUTION
· Always perform terminal wire connection inspections when power to the devices has been interrupted.
· Do not touch charged parts of the terminals while current is being applied. There is danger of electrical
shock, electrical burns, and damage to equipment.
CAUTION