TDK-Lambda Genesys User Manual page 72

3. Daisy-Chain Connection for Shut-Off
This set up and connections are optional but are strongly recommended. It
will shut down all power supplies when a fault condition occurs in any single
power supply (see Figure 6-6).

Switch SW1-5 should be in its DOWN position for all power supplies.

Connect J1-16 (PS_OK) of the Master Supply to J1-15 (SO) of the 'First'
Slave Supply (if any).

Connect J1-16 (PS_OK) of the 'First' Slave Supply to J1-15 (SO) of the
'Second' Slave Supply (if any).

Connect J1-16 (PS_OK) of the 'Second' Slave Supply to J1-15 (SO) of
the 'Third' Slave Supply (if any).

Connect J1-16 (PS_OK) of the 'Last' Slave Supply to J1-15 (SO) of the
'Third' Slave Supply (if any).

Connect J1-2 or J1-3 (IF_COM) of all power supplies together.
POWER SUPPLY
#1
J1-2,3 J1-16
IF_COM PS_OK
4. Setting Over Voltage Protection (OVP)
The Master unit OVP setting should be programmed to the desired OVP
level. The OVP setting of the Slave units should be programmed to a
higher value than the Master OVP setting, which should prevent the Slave
unit from shutting down before the Master unit does. Thus, when the
Master unit shuts down due to an OVP condition, it programs the parallel
system Output voltage to zero Output voltage.
If a Slave unit shuts down (when its OVP is set lower than the Master
Output Voltage and, if all P/S are not daisy-chained), only that Slave unit
would shut down, and the remaining Slave units would supply all the load
current.
When there is a risk from Output over voltages, it is recommended to use
the Shut-Off Daisy-Chain method (see "Daisy-Chain Connection for
Shutoff" above) so all power supplies will turn off together.
5. Setting Foldback Protection (FB)
Foldback protection, as desired, may only be used with the Master unit.
Thus, when the Master unit shuts down, it programs the parallel system
Output voltage to zero Output voltage.
POWER SUPPLY
#2
J1-15 J1-2,3 J1-16
PS_OK SO
SO IF_COM
Fig. 6-6: Daisy-chain connection
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83532002 Rev C
POWER SUPPLY
#3
J1-15 J1-2,3 J1-16
PS_OK SO
IF_COM
J1-15