©
Panduit Corp. 201
4
OPERATION MANUAL
UPS003024024015
Page: 17 of 29
Figure 6: Load Sense Module
Pins 3 and 4 of the load sense module are connected to the sense input terminals of the UPS.
Note that pin 3 of the current sense resistor must be connected to the
“
+
”
sense terminal and
pin 4 of the current sense resistor must be connected to the
“
-
“
sense terminal. Note that these
connections may not be reversed. These connections allow the UPS to measure the current
flow to the load under normal operation so that it can predict the run time when backup power
is being provided by the UPS.
The secondary AC/DC converter provides to the input terminals of the UPS while the output
terminals of the UPS provides the secondary power supply to the load. Ensure that the
orientation of the
“
+
”
and
“
-
“
terminals are connected as shown in Figure 5. Note that there is a
common ground connecting the two AC/DC converters, the UPS and the load. The UPS will
connect the
“
-
“
terminal of the input and the
“
-
“
terminal of the output together internally. The
ground connection between these two terminals should be connected as shown so that if the
UPS is removed from the system, the common ground connection between the AC/DC
converters and the load is retained.
The sense, input and output terminals of the UPS are designed to accept UL/CUL
12 to 30
AWG wire. 12 gauge wires are recommended to reduce resistive losses and minimize error of
the external current sensing function.
The described installation provides redundant power to the load in the case of a failure of either
AC/DC converter. In the case of a failure of both AC/DC converters, or the input AC power, the
UPS will provide backup power to the load as described in Section 3.3.
The UPS may also be used in a non-redundant power supply application. In this case the
primary AC/DC converter and load sense module are omitted. The UPS will provide backup
power to the load in the event of a failure of the incoming AC power.
GENERAL OPERATION
3.3.
Once the UPS is installed per Section 3.2, power may be applied to the secondary AC/DC
converter as well as the primary AC/DC converter if present. The UPS can then be switched to
the
“
ON
”
position. If the input voltage is too high the MOD LED flashes red.
Switch the unit to
the
“
OFF
”
position, remove AC power from the system and recheck the connections.
After the unit is switched on, the
“
Charge Status - CHG
”
LED should flash green indicating that
the unit is charging. Once the unit is fully charged, the
“
Charge Status - CHG
”
LED will
illuminate solid green. The unit is now ready to provide backup power to the load in the event of
an AC power failure.
