INSTRUCTION MANUAL
HWS 3000G
TDK-Lambda
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6-9-2. N+1 redundant operation
In power supply systems that require higher reliability, it is possible to increase system reliability
by using N+1 units for a load of N units.
When N+1 units are operating in parallel, even if one unit stops, the load current is automatically
shared with the other power supplies to maintain system functionality.
Connecting CB to CB terminal and AG to AG terminal, the current balancing function activates
and output current of each power supply is equivalently supplied to load.
This product has a function to disconnect the CB terminal when the power is stopped, which
suppresses fluctuations in the output voltage when one unit is stopped.
The CB and AG terminals are isolated from the power input and output circuits.
・Wire to CB terminal, AG terminals shall be as short as possible and same length with twist.
・Adjust the output voltage of each power supply to be same value within 1%.
・Use same length and type of wires for all load lines.
・Parallel operation is possible up to 10 units. Maximum value of output current in parallel is up to
95% of all paralleled models.
・There is a possibility that output voltage dips at dynamic load change.
・When changing the output rise speed settings (both current and voltage) using the communication
function, be sure to use the same settings for all power supplies.
・Even if one unit stops, check that the output current satisfies the formula below using only a
normally operating power supply.
Maximum output current ≦ Rated current per power supply × Number of power supplies
operating normally × 0.95
・Redundant operation is not possible with other products.
・When two or more power supplies fail and cannot supply output current, the output voltage may
drop and the system may stop.If even one power supply is found to be faulty, immediately replace
the faulty power supply.
A failed power supply can be identified using the shortage alarm.
・Disconnect the input voltage before removing or replacing a failed power supply.
・Depending on the failure mode of the power supply, redundant operation may not be possible.
If you want to perform complete redundant operation, please build a redundant function by adding
a diode to the output of the power supply.
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