Advanced PSU EN54-4, Руководство пользователя, Страница: 10 / 16

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10
3.2.2 Output Connections:
3.2.2.1 To Load:
Connect the 28V output connections to the load via terminals
VO+ & VO
–
respectively via appropriately rated cable for the
output rating:
For 3.0A/5.0A PSE a minimum 0.75 mm²
For 1.5A PSE a minimum of 0.22mm²
NB Maximum cable size is limited to 2.5mm²
Refer to diagrams opposite for the positions of all output
connections.
Maximum Cable Resistance:
The voltage drop on the output circuit should be calculated to
ensure that the minimum voltage at the end of the circuit
exceeds the minimum required by the device at the minimum
PSE output voltage.
The voltage at the end of the circuit is given by:
Minimum Load Voltage = V
OUT(MIN)
– (I
LOAD
x R
CABLE
)
Minimum Output Voltage (V
OUT(MIN)
) is V
BAT(MIN)
– 0.5V =
20.5V
Load Current (I
LOAD
) is the sum of the loads presented by the
devices.
Cable Resistance (R
CABLE
) is the sum of the cable resistance
in both cores x cable length.
Cable Resistance (R
CABLE
) for 1.0mm
2
is 0.036Ω / m
Cable Resistance (R
CABLE
) for 1.5mm
2
is 0.024Ω / m
Cable Resistance (R
CABLE
) for 2.5mm
2
is 0.015Ω / m
BAT
–
BAT +
VO
–
VO +
COM
N/O
N/C
Remote LED
Start from
battery Switch
Fault
Output
Configuration
Serial Link
Comm
on A
rrang
ement
Not on 1
.5A
SE
Remote Temp
Sensor
Jumper Link for local
temperature sensor
Observe that the load is connected
with the correct polarity!
Route the wiring away from any
mains connections.
3.2.2.2 To Battery:
The system is designed to charge 24V batteries or
two 12V batteries connected in series. Refer to
diagram opposite.
Use the short black connection link to connect the
batteries.
Use the Red & Black leads provided to connect the
batteries to the
BAT+ & BAT
–
terminals on the PSU.
Take care to observe the correct polarity and
ensure the battery leads do not become shorted
together!
Mount the batteries on the bottom of the enclosure.
+
-
+
-
+
-
#1 #2
RED
BLACK
Link Cable
3.2.2.3 Fault Output Connections:
Power supply/charger fault outputs are provided for in the form of volt free changeover contacts designated
COM, N/O & N/C . These are available via three terminal blocks screws
– refer to diagram above.
The “Fault” relay is held in a normally energised state. It will fail to safety (de-energise) under any power
supply/charger “Fault” conditions.