Rockwell Automation Publication 1606-RM104A-EN-P - July 2020
21
1606-XLSBUFFER24 Buffer Module
The 1606-XLSBUFFER24 buffer module is a supplementary device for DC 24V
power supplies. It delivers power to bridge typical mains failures or extends
the hold-up time after the AC power is turned off.
When the power supply provides a sufficient voltage, the buffer module stores
energy in the integrated electrolytic capacitors. When the mains voltage is lost,
the stored energy is released to the DC-bus in a regulated process.
The buffer module can be added in parallel to the load circuit at any given
point and does not require any control wiring.
One buffer module can deliver 20 A additional current and can be added in
parallel to increase the output ampacity or the hold-up time.
For longer hold-up times, the 1606-XLSBUFFER24 might also be an option.
Series Operation
Devices of the same type can be connected in series for higher output voltages.
It is possible to connect as many units in series as needed, providing the sum
of the output voltage does not exceed 150V DC. Voltages with a potential above
60V DC must be installed with a protection against touching.
Avoid return voltage (for example from a decelerating motor or battery) which
is applied to the output terminals.
Keep an installation clearance of 15 mm (0.59 in.) (left / right) between two
power supplies and avoid installing the power supplies on top of each other.
When using the power supplies in series, use the standard mounting
orientation.
Leakage current, EMI, inrush current, and harmonics increase when using
multiple devices.
Figure 23 - Series operation
Unit A
AC
DC
Unit B
AC
DC
-
+
-
+
Load
+
-
Earth
(see notes)