Section II
General Product Information
006-0007129 10/12/2018
Rev B
20 of 60
UPS-1500 3-Phase Guide
www.synqor.com
Power Cable Wire Size
SynQor recommends the following cables for use with the UPS-1500 Series:
AC INPUT:
SYN-9114 UPS connection to NEMA L15-30P Plug, 10’
SYN-9113 UPS connection to Hardwire Termination, 10’
AC OUTPUT: SYN-9131 UPS connection to NEMA 5-20 Receptacle, 10’
SYN-9130 UPS connection to Hardwire Termination, 10’
DC INPUT:
SYN-9151 UPS connection to Ring Connectors, 10’
SYN-9154 UPS connection to NATO Connector, 10’
DC1 OUTPUT: SYN-9171 UPS connection to Fork Connectors, 10’
SYN-9172 UPS connection to Hardwire Termination, 10’
DC2 OUTPUT: SYN-9174 UPS connection to Harwire Termination, DC2 OUTPUT, 10’
SYN-9175 UPS connection to Fork Connectors, DC2 OUTPUT, 10’
Other options may be available. Contact
info@synqor.com
or visit the website:
http://www.synqor.com
for more information. If it is necessary to develop custom cables for your
application, please read through the following section for some important considerations. Note:
Damage caused by improper wiring of cables will not be covered under SynQor’s warranty.
Both the input and output cables of the UPS carry substantial current, and since the wires in
these cables have resistance, the current flowing through them causes a voltage drop from one
end of the cable to the other. In other words, the voltage across the cable at its downstream end
is smaller than the voltage across the cable at its upstream end. Mathematically, the amount
that the voltage drops is equal to the resistance of the cable’s wire multiplied by the current
flowing through the wire. It is therefore important to make sure that the resistance of the cable’s
wire is small enough to keep this voltage drop to an acceptable level.
While this is an issue for all of the power cables, it is particularly important for the DC INPUT and
DC2 OUTPUT cables. DC current flowing through these cables can be very high (65 A for the
UPS-1500 Series) while at the same time, the input voltage to the UPS is relatively small (22 V). A
common problem might develop due to high cable resistance (when the DC INPUT cable gage is
too small) which causes the input voltage to the UPS to fall below the 22V minimum. Under this
condition the UPS will switch to the internal battery pack for its power source even though the
voltage at the DC power source appears to be available and within proper range.
The resistance of a wire is also directly proportional on its length. A wire twice as long as another
will have twice the resistance, holding all other things constant. The resistance in a cable is also
inversely proportional to the cross-sectional area of the wire, which in turn is proportional to the
square of the diameter of the cable. A wire with half the diameter of another will therefore have
four times the resistance, holding all other things constant.