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SYS POWER SUPPLY UM E
3.4
Adjustability of the Output Voltage
Adjustment range:
+22.5 V DC to +28.5 V DC
Compensating power
dissipation
Phoenix Contact offers power supply units with either fixed voltage output or adjustable
voltage output.
QUINT POWER power supply units have a nominal output voltage of 24 V. This voltage
can be freely adjusted in the range from 22.5 V to 28.5 V. By default, these devices are set
to a voltage of exactly 24 V DC.
Fields of Application
The adjustable outputs allow for compensation of voltage drops in connected cables for
spatially distributed systems. Adjusting the charging voltage also enables charging lead-
gel accumulators.
Power dissipation in the supply cable for the secondary circuit increases linearly with
increasing current and cable length. Table 3-5 shows the voltage losses in function of the
cable cross section and the output current. For the calculation of the voltage losses also
see section 3.9, "Layout of 24 V DC Supply Cables (Cable Cross Section)".
If the default 24 V DC setting has been adjusted for devices, which are to be connected
in parallel, it is strictly necessary to carry out a balancing procedure as described in
section 3.1, "Parallel Connection".
Power supply
unit
Figure 3-16
Cable length
U L
Load
5598D024
Explanation of the Tables:
Table 3-5 shows the on-load voltages U L for an output voltage of 24 V and 28.5 V. The first
line indicates the nominal output voltage of the power supply unit. Lines 3 to 8 indicate the
cable lengths in meters. The cable path from the power supply unit to the load has been
taken into account.
3-20
PHOENIX CONTACT
5598_en_03
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2938860-2 制造商: 功能描述: 制造商:undefined 功能描述:
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