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Rockwell Automation Publication 1606-RM100A-EN-P - July 2020
Power Supply - 24V, 5 A, 120 W, Single-phase Input Reference Manual
Charging Batteries
The power supply can be used to charge lead-acid or maintenance free
batteries. Two 12V SLA or VRLA batteries are needed in series connection.
Instructions for charging batteries:
a. Use only matched batteries when putting 12V types in series.
b. Ensure that the ambient temperature of the power supply stays below 40 °C
(104 °F).
c. Use a 10 A circuit breaker or a 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. The return current to the power supply is typically 8 mA. This return
current can discharge the battery when the power supply is switched off
except in case a blocking diode is utilized.
f. Set the output voltage, which is measured at no load and at the battery end-
of-charge voltage. The voltage should be set to the following at these
ambient temperatures:
• 27.8V at 10 °C (50 °F)
• 27.5V at 20 °C (68 °F)
• 27.15V at 30 °C (86 °F)
• 26.8V at 40 °C (104 °F)
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
Output 60V DC must be installed with a protection against touching.
Avoid return voltage (load, and 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.
Do not use power supplies in series in mounting orientations other than the
standard mounting orientation.
IMPORTANT
The CD-OK relay triggers when the voltage dips more than 10
percent for longer than 1 ms.
Peak Current Voltage Dips
Typically from 24V to 16V
At 10 A for 50 ms and resistive load
Typically from 24V to 16.5V
At 25 A for 2 ms and resistive load
Typically from 24V to 14V
At 25 A for 5 ms and resistive load
