4
can cause damages to the equipment and/or to the loads and installa-
tion.
•
The local electrical regulations and the different restric-
tions of the client's site, they can invalidate some recom-
mendations included in the manuals. when discrepancies exist,
the user has to comply the local regulations.
•
The equipments provided with power cord with plug and
outlets, can be connected and used by personnel without
any kind of experience.
The equipments with power blocks have to be installed by quali-
fied personnel and can be used by personnel with no specific
training, just with only help of this manual.
A person is defined as qualified, if it has experience of assem-
bling, commissioning and perfect control operating of the equip-
ment, if he has the requirements to do the job and if has read and
understand all the things described in this manual, in particular
the safety indications. Such preparation is considered only valid if
it is certified by our KESS Support-Team.
• Place the equipment the closest to the power supply and loads
to be supplied, leaving an easy access if it were needed an urgent
disconnection.
in the hardwired equipments and due to the impossibility of fast
disconnection, a disconnection device (switch) with easy access
and close to the equipment will be installed.
• warning labels should be placed on all primary power switches
installed in places away from the equipment to alert the electrical
maintenance personnel of the presence of a UPS in the circuit
The label will bear the following text or an equivalent one:
before working in this circuit.
• isolate the Uninterruptible Power System (UPS).
• Check the voltage between all terminals including the
protective earth.
Risk of voltage feedback from UPS.
1.2.3.1. General safety warnings
• All connections and disconnections of the cables from the equip-
ment, including the control ones, will be done with no power
supply and the switches on rest, position «on» or «off».
• Shutdown the equipment completely by switching «off» the
button of the control panel first. next disconnect the cable from
the wall outlet for standard equipments up to 3 kVA or by switching
«off» the input circuit breaker and disconnect the power supply ca-
bles in models with higher power rate.
The indiscriminate manoeuvring of the switches may in-
volve production losses and/or equipment damages.
Consult the documentation before doing any action
•
Pay special attention to the labelling of the equipment
that warns about the «Electrical shock hazard». inside the
equipment there are dangerous voltages, never open the enclo-
sure, the access has to be done by qualified staff. in case of main-
tenance or fault, contact the KESS Support-Team.
• Cross cable sections used to supply the equipment and loads, will
be according to the nominal current stated in the nameplate label
of the equipment, and respecting the low Voltage Electrotechnical
Regulations or standards of the country.
Use approved cables only.
•
Protection Earth cable of the UPS drives the leakage current of
the load devices. An isolated earth cable has to be installed as
part of the circuit that supplies the equipment. Cross cable section
and its features will be same as the power supply cables and have
to have an protection earth cable.
All outlets of the UPS has an earth bonding, duly connected and
those equipments with power blocks there is an exclusive ter-
minal for the load earth connection. when an outgoing distribu-
tion is done, i.e power strips, it is essential that they have an earth
terminal connected to each one of them.
it is essential that the cables that supplies the loads have the
earth connection cable.
The protection earth must be connected to the frame or
metallic chassis of any electrical equipment (in our case to
the UPS, battery cabinet or case and loads), assuring that it is done
before connecting the input voltage.
Check the quality and availability of the earth, it has to be be-
tween the defined parameters by the local or national regula-
tions.
• in small equipments (the ones connected with the foreseen
power cord with plug), the user has to check the wall outlet cor-
responds with the type of supplied plug, with earth duly installed
and connected to the local protection earth.
•
During the normal UPS operation, in equipments up to
3kVA the power cord cable can't be disconnected from
wall outlet, because the protection earth of the own UPS would
be disconnected and also the earth from the loads connected to
the output.
For this reason, the general protection earth cable of the
building or switchgear panel that supplies the UPS will not be
disconnected.
• in small UPS (the ones connected with the foreseen power cord
with plug), check that the sum of the leakage currents of the UPS
and connected load/s do not exceed over 3,5mA.
• The installation will have input protections sized to the currents
of the equipment and stated in the nameplate label (RCD de-
vices type b and circuit breakers with C characteristic or any other
equivalent one).
overload conditions are considered as a nonpermanent an ex-
ceptional operating mode, so these currents will not be kept in
mind when sizing the protections.
• Do not overload the UPS by connecting loads with inrush con-
sumptions at its output, like laser printers.
• output protection will be done with a circuit breaker of C charac-
teristic or an equivalent one.
it is recommended to distribute the output power, into four lines
as minimum. Each one of them will have a protection circuit
breaker sized to the quarter of the nominal power. This kind of
outgoing distributions will allow that any fault in any device con-
nected to the equipment, that makes a short-circuit, will affect
to the line with the faulty device only. An uninterruptible power
supply will be guaranteed to the rest of connected loads, due to
the protection tripping of the affected line by the short-circuit
only.
• when replacing a fuse, do it for another of the same type, character-
istics format and size.
• Under any concept the input power cord will be connected to the
output of the equipment, either directly or through other ways.
