All parameters are specified at 24V, 2.5A, 230Vac input, 25°C ambient and after a 5 minutes run-in time unless noted otherwise.
Rockwell Automation Publication 1606-RM014A-EN-P — March 2014
19
Bulletin 1606 Switched Mode Power Supplies
21.3. Charging Batteries
The power supply can be used to charge lead-acid or maintenance free batteries. (Two 12V batteries in series)
Instructions for charging batteries (float charging):
a)
Ensure that the ambient temperature of the power supply is below 45°C
b)
Set output voltage (measured at no load and at the battery end of the cable) very precisely to the end-of-charge
voltage.
End-of-charge voltage
27.8V
27.5V
27.15V
26.8V
Battery temperature
10°C
20°C
30°C
40°C
c)
Use a 4A circuit breaker (or blocking diode) between the power supply and the battery.
d)
Ensure that the output current of the power supply is below the allowed charging current of the battery.
e)
Use only matched batteries when putting 12V types in series.
f)
The return current to the power supply (battery discharge current) is typical 7.3mA when the power supply is
switched off (except in case a blocking diode is utilized).
21.4. External Input Protection
The unit is tested and approved for branch circuits up to 20A. An external protection is only required, if the supplying
branch has an ampacity greater than this. Check also local codes and local requirements. In some countries local
regulations might apply.
If an external fuse is necessary or utilized, minimum requirements need to be considered to avoid nuisance tripping of
the circuit breaker. A minimum value of 6A B- or 3A C-Characteristic breaker should be used.
21.5. Parallel Use to Increase Output Power
1606-XLP60EQT power supplies may be used in parallel to increase output power.
This power supply does not include any feature included that balances the load
current between the power supplies. Usually the power supply with the higher
adjusted output voltage draws current until it goes into current limitation. This
causes no harm to the power supply as long as the ambient temperature stays
below 45°C. The 1606-XLP60EQT can also be used in parallel with other, similar
power supplies with 24V output voltage. The output voltages of all power supplies
need to be adjusted to the same value (±100mV). A fuse or diode on the
output of each unit is required only if more than three units are connected in parallel. If you use a fuse or circuit
breaker, choose one with approximately 150% of the rated output current of one power supply. Keep an
installation clearance of 15mm (left / right) between two power supplies and avoid installing the power supplies on
top of each other. Do not use power supplies in parallel in mounting orientations other than the standard mounting
orientation (input terminals on the bottom and output terminals on top of the unit). Be aware that leakage current,
EMI, inrush current and harmonics will increase when using multiple power supplies in parallel.
Unit A
AC
DC
Unit B
AC
DC
-
+
-
+
Load
+
-