TDK-Lambda DRF960-1 Serie Manuel page 16

Doc No. 260301
4-7. Series Operation
For series operation, either method (A) or (B) is possible.
For reliable operation both units should be connected to the
same AC supply with both output voltages in the range 24-
28VDC.
Method ( A )
Power
Supply
Output
Terminal
Output
Terminal
Method ( B )
Power
Supply
Output
Terminal
Output
Terminal
4-8. Parallel Operation
To use as Back-up Power Supply
1. Set power supply output voltage higher by the forward
voltage drop(VF) of diode.
2. Adjust the output voltage of each power supply to be
within 0.1% of each other.
3.
Use within the specifications for output voltage and
output power.
Output
Terminal
Output
Terminal
4.
When paralleling units cut the link between pins 1 & 2
of signal connector located on the top of the unit.
Load
5. Use similar output cable length and gauge for
Load
6. Up to 5 units may be connected in parallel. Derate
total output load current by 20%.
7. PV function should not be used during parallel
operation.
Load
4-9. Output Dynamic Load Response
During output dynamic load test (0%-100% load), the output
voltage level might experience a higher voltage dip of -15%
(typ).
5. DC OK relay
In normal operation the DC Good relay is closed when the
output voltage is greater than 80% of nominal output voltage.
When the output is less than 80% of nominal output voltage
the relay is open.
6. Programming Voltage (PV)
The output voltage may be adjusted, between 24 – 28V, by
the application of an external programming voltage, in the
range 5-6V, to pins 7 and 8 of the signal connector (see
TDK-Lambda
DRF960 Series
INSTRUCTION MANUAL
Power
Supply
optimum load sharing.
Load
8 6 4 2
7 5 3 1