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2.11
Daisy-Chain Connection
It is possible to configure a multiple power supply system to shut down all units when a fault
condition occurs in one of the units. When the fault is removed, the system recovers according to a
preset state: Safe start mode or Auto-restart mode.
If a fault occurs in one of the units, its "Daisy out" signal will be set to low level and the display will
indicate the fault. The other units will shut off and their displays will indicate SO FAULT. When the
fault condition is removed, the units will recover to their last setting according to their respective
Safe start or Auto-restart setting.
Figure 2–7: Daisy-Chain Connection shows connection of three units, however the same
connection method may be applied to systems with more units.
POWER SUPPLY # 1
2.11.1
Daisy In Function
DAISY_IN signal is used only for Daisy Chain application, connected to DAISY_OUT signal of a
master unit. It is an isolated signal from the power supply output.
Connection to the signal is made via pin J1-1 (DAISY_IN) and pin J1-11 (COM_SELV).
The DAISY_IN pin accepts 2V to 25V as high level signal, 0V to 0.6V as low level signal or Open-
Short contact to enable or disable the power supply output.
The Daisy in function will be activated only after initial High to low transition is detected.
Thus, in the Auto start mode, the output will be enabled after applying AC power, even if DAISY_IN
is in low level. DAISY_IN is ignored after power supply output OFF event, Power Switch OFF
event & Faults.
After high to low transition is detected, the SO will enable or disable the power supply output
according to the signal level or the short/open applied to J1. When the external DAISY_IN is
triggered, the power supply will display SO FAULT on the voltage display.
For signal details, refer to Table 2-3.
POWER SUPPLY # 2
Figure 2–7: Daisy-Chain Connection
36
POWER SUPPLY # 3
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