Transient and steady state earth leakage currents, which may occur when the equipment is started, should be
taken into account in the selection of instantaneous RCCBs or RCD devices.
RCCB which is sensitive to unidirectional DC pulse (class A) and insensitive to transient state current pulse
must be selected.
Note also that the earth leakage currents of the load will be carried by the RCCBs or RCDs.
The equipment must be earthed in accordance with the local electrical code of practice.
Warning: backfeeding protection
This UPS is fitted with a dry contact closure signal for use with an external automatic disconnect device
(supplied by others) to protect against backfeeding voltage into the incoming terminal through the rectifier or
bypass static switch circuit. A label must be added at all external incoming primary supply disconnect device to
warn service personnel that the circuit is connected to a UPS. The text of the label has the following meaning:
Risk of voltage backfeed! Isolate the UPS, then check for hazardous voltage between all terminals including the
protective earth before working on this circuit.
User serviceable components (For service personnel)
All equipment maintenance and servicing procedures involving internal access requires the use of a tool and
should be carried out only by trained personnel. There are no user-serviceable parts behind covers requiring a
tool/key for removal.
Battery voltage exceeds 400Vdc (For service personnel)
All physical battery maintenance and servicing procedures requires the use of a tool/key and should be carried
out only by trained personnel.
Take special care when working with the batteries associated with this UPS. When connected together, the
battery terminal voltage will exceed 400Vdc and is potentially lethal.
Battery manufacturers supply details of the necessary precautions to be observed in working on, or in the
vicinity of, a large bank of battery cells. These precautions should be followed implicitly at all times. Particular
attention should be paid to the recommendations concerning local environmental conditions and the provision
of protective clothing, first aid and fire-fighting facilities.
General safety (For users)
Like other types of large power equipment, the UPS and battery circuit breaker box/battery cabinet have high
voltage inside. Because the components with high voltage can be accessed only when the front door is
opened, the risk of contacting high voltage has been minimized. This equipment meets the IP20 standard, and
other safety shields are provided inside the equipment.
There will not be any risk when operating this equipment according to the general instructions and the steps
recommended in this manual.
Multiple power inputs (For users)
This UPS system receives power from more than one source. Disconnection of all AC source and the DC
source is required before servicing.
This UPS has several circuits that are energized with high AC as well as DC voltages. Check for voltage with
both AC and DC voltmeters before working within the UPS.
Summary of Contents for EXM 0080kTK16FN01000
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