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83
-
507
-
013 Rev. D
44
5.16 DAISY
-
CHAIN CONNECTION
It is possible to configure a multiple power supply system to shut down all the units when a fault cond
i-
tion occurs in o
ne of the units. When the fault is removed, the system recovers according to its setting
to Safe
-
start or Auto
-
r
e
start mode.
Setup switch SW1, position 5 should be set to its DOWN position to enable the Daisy
-
chain operation.
Other SW1 pos
i
tions can be set
according to the application requirements.
If a fault occurs in one of the units, its PS_OK signal will be set to a low level and the display will ind
i-
cate the fault. The other units will shut off and their display will indicate “SO”. When the fault condi
tion
is removed, the units will recover to their last setting according to their Safe
-
start or Auto
-
restart se
t-
ting.
Fig.5
-
6 shows connection of three units, however the same connection method applies to systems
with a larger number of units.
5.17 FRONT
PANEL LOCKING
The front panel controls can be locked to protect from accidental power supply parameter change.
Press and hold the PREV button to toggle between “Locked front panel’ and “Unlocked front panel”.
The display will cycle between “LFP” and “UFP”
. Releasing the PREV button while one of the modes
is displayed, s
e
lects that mode.
5.17.1 Unlocked front panel
In this mode, the front panel controls are Enabled to program and monitor the power supply param
e-
ters.
5.17.2 Locked front panel
In this mode th
e following front panel controls are Disabled:
-
VOLTAGE and CURRENT encoders.
-
FOLD button.
-
OUT button
The power supply will not respond to attempts to use these controls. The VOLT display will show
“LFP” to ind
i
cate that the front panel is locked.
OVP/ UVL button is active to preview the OVP and UVL setting.
Use the PREV button to preview the Output Vol
t
age and Current setting or to unlock the front panel.
Fig.5-6: Daisy-chain connection
POWER SUPPLY
#
1
J1-2,3
J1-16
J1-16
J1-16
J1-15
PS_OK
POWER SUPPLY
#
2
J1-2,3
J1-15
PS_OK
SO
POWER SUPPLY
#3
J1-2,3
J1-15
PS_OK
SO
SO
IF_COM
IF_COM
IF_COM
Fig.5-5: Parallel operation with Remote sensing
MASTER
POWER SUPPLY
SLAVE#1
POWER SUPPLY
J1-25
J1-10
P
IPGM
+
V
-
V
+
V
-
V
+S
-S
LOAD
As short as possible
Twisted
pair
+S
-S
+S
-S
Twisted
pair
J1-8
J1-12
To J1-10
SLAVE#2
POWER SUPPLY
+S
+LS
-LS
-S