Liebert APM 150 User Manual page 4

Warning: backfeed protection
This UPS is fitted with a voltage-free contact closure signal for use with an external automatic disconnect device
(supplied by others) to protect against back-feeding voltage into the static bypass input. If this signal is not used by
the installer, a label must be added at the external bypass input disconnect device to warn service personnel that
the circuit is connected to a UPS.
The text to use is the following or equivalent: Isolate the UPS before working on this circuit.
User-serviceable parts
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
for removal.
This UPS is fully compliant with safety regulations for equipment located in an operator accessible area. Hazardous
voltage is present within the UPS but out of reach of non-service personnel. Contact with hazardous voltage is
minimized with live parts housed behind safety panels that require a tool for their removal. No risk exists to any
personnel when you operate the equipment in the normal manner, following the recommended operating
procedures.
Battery voltage exceeds 400Vdc
All physical battery maintenance and servicing requires the use of a tool or a key and should be carried out only by
trained personnel.
Take special care when working with the batteries. 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 when working on, or in the
vicinity of, a large bank of battery cells. These precautions should be followed implicitly at all times. Attention
should be paid to the recommendations concerning local environmental conditions and the provision of protective
clothing, first aid and fire-fighting facilities.
Warning
The area around the cover of the monitoring board is a static sensitive area, please make anti-static processing
when in contact with this area.
Warning
When selecting the UPS system pre-stage distribution protection equipment, ensure that it complies with the
local electric regulations.
The specified upstream breakers are required to obtain the conditional short-circuit current rating, Icc at 10kA
symmetrical rms. The specified upstream breakers should comply with an IEC 60947 series standard.