Subject to modifications
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PS3500 N+1 Redundant Power Supply
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5 Technical concept
The power supply system consists of two different backplanes (3 and 6 slots) and the
power supply module. The key features of the system are:
•
Nominal output 24 V/15 A per module (See Output Derating Curves)
• Nominal input of 90 to 250 V AC/90 to 300 V DC per module
• N+1 redundancy
• Automatic load-sharing
• High efficiency (up to 91%)
• Fanless
• Module output voltage is adjustable at the backplane from 22.5 V to 30 V
• Basic module failure alarming via relay contact (normally open/close configurable)
• Redundancy on supply line
5.1 N+1 redundancy
N+1 redundancy is based on the fact, that the maximum drawn current is lower than the
maximum current provided by the overall number of modules minus one. Based on the
backplane size, N can be any number between 1 and 5.
5.2 Hot swapping
Hot swapping allows replacement of a module under power without any visible functional
impact on the output side. Hot swapping is allowed only in an environment where no
hazardous materials are present. The hot swapping feature is not permitted in a Class I/
Div 2 area or Zone 2 area unless under a hot permit.
5.3 Automatic load-sharing
The power supply modules implement a real load-sharing function; all modules supply the
same amount of current. The tolerance for the current difference between the modules
should be within a range of ±1.5 A.
5.4 Variable output voltage
The factory default output voltage is 24 V. The output voltage is adjustable in a range from
22.5 V to 30 V for each module by using a potentiometer. Inserted modules can be easily
adjusted with a screwdriver during setup. Potentiometers are accessible on the adjacent
backplane slot making the voltage setting tamper proof during operation.
5.5 Alarm output
Each power module has its own alarm monitoring circuit that controls a relay for a common
failure output signal. It can be configured normally open or normally closed using the
terminal blocks on the backplane.
