Warning: high leakage current
Earth connection is essential before connecting the input supply (including the AC mains and battery). The UPS
must be earthed in accordance with local electrical codes.
Earth leakage current exceeds 3.5mA and is less than 3000mA.
Transient and steady state earth leakage currents, which may occur when the equipment is started, should be
taken into account when selecting instantaneous RCCB or RCD devices.
RCCBs must be selected insensitive to DC unidirectional pulses (Class A) and transient current pulses.
Also note that the earth leakage currents of the load will be carried by this RCCB or RCD.
Warning: backfeeding protection
This UPS is fitted with a contact closure signal for use with an external automatic disconnect device (supplied by
others) to protect against backfeeding dangerous voltage into the input terminal through the bypass static switch
circuit. A label must be added at the external power disconnect device to warn service personnel that the circuit is
connected to the 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 parts
All equipment maintenance and servicing procedures involving internal access requires the use of a tool and
should be carried out only by trained professionals. There are no user-serviceable parts behind covers requiring a
tool/special key for removal.
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, take anti-static measures when
accessing 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.
Summary of Contents for Liebert APM 300
Page 1: ......
Page 2: ......
Page 7: ...The Manual Covers The Following Equipment Product Model APM 300 Liebert APM 300...
Page 9: ......
