one power supply fails.
Maximum output current
[
Rated current per unit
X
Numbers of
normal operated units
X
0.95
¡
If you add one extra power supply in parallel operation, even if
one of the power supplies in your system fails, the remaining non-
failed power supplies continue to sustain the system. If one of the
power supplies stops operating, the output voltage may change
about 5%.
¡
Parallel with other products is not allowed.
¡
Please shut off the input voltage when you replace a failed power
supply.
¡
After replacement, please make sure that all wirings are complet-
ed correctly, before re-applying input voltage.
¡
Hot-swap or Hot-plug is not available.
¡
2 or more power supplies failures may cause the output voltage to
decrease, lending the application system to shut down. Immediate
replacement is recommended when a power supply has failed.
+V
VB
CB
COM
-V
Power supply
Load
+V
VB
CB
COM
-V
Power supply
+V
VB
CB
COM
-V
Power supply
Fig.3.3 Example of N+1 redundancy operating connection
¡
If you have any questions about series, parallel and N+1 redun-
dancy operations, please contact us.
4 Assembling and
Installation Method
4.1 Installation Method
¡
Screw mounting requires considering the product weight for safety
fixtures.
¡
To keep enough insulation distance between screws and internal
components, length of the mounting screw should not exceed rec-
ommendation as shown in Table4.1.
a
Chassis of
FETA7000ST
Chassis of
customer system
Mounting Screw
Fig.4.1 Mounting screw
Table 4.1 Max penetration length
Size
a (Max penetration length)
M3
10mm max
M4
15mm max
¡
The power supplies have a built-in forced cooling fan. Do not
block ventilation at the suction side and its opposite side.
¡
If you use a power supply in a dusty environment, it can cause a
failure. Please consider taking such countermeasures as install-
ing an air filter near the suction area of the system to prevent a
failure.
(a) Front side
(b) Rear side
Air flow
Air flow
Intake opening
Exhaust opening
Fig.4.2 Location of intake port and exhaust port
30mm min
30mm min
FETA7000ST
Intake
opening
Exhaust
opening
Fig. 4.3 Clearance of intake port and exhaust port
¡
When mounting the power supply with screws, it is recommended
that this be done as shown in Fig.4.4. If other methods are used,
be sure the weight of the power supply is taken into account.
AC-DC Power Supplies Enclosed Type
Instruction Manual
FETA-13