English
INSTALLATION AND CONNECTION
circuits, such as sensors, digital inputs, loads on digital outputs, etc. via the VOUT output of XC1. In applications
that use multiple accessories, it may be necessary to use an external 24 Vdc power supply.
Follow the next steps to evaluate the consumption of the internal power supply and calculate the current available
in VOUT:
1. Check the consumption of the accessories that will be installed in each backplane slot through
2. Add the consumption of each accessory to be connected to slots A to G using the equation:
I
ACC
=
I
ACC,A
+
I
ACC,B
+
I
ACC,C
+
I
ACC,D
+
I
ACC,E
+
I
ACC,F
+
I
ACC,G
, to obtain the total consumption
of the accessories;
3. Check the total current consumed by the accessories:
If the current drawn by the accessories is greater than 0.8 A, (i.e.,
I
ACC
>
0,8 A) it will be necessary to use
an external power supply. Check item
;
If the consumption of the accessories is less than or equal to 0.8 A (i.e.,
I
ACC
≤
0,8 A), the remaining
current can be consumed through the VOUT outputs. Go to item 4 to check the current available in VOUT;
4. Calculate the maximum current in VOUT:
I
OU T
=
0,8 A
−
I
ACC
;
5. Check that the circuits to be connected to the VOUT output do not exceed the calculated maximum current
I
OU T
.
Table 3.16:
Examples of how to check the consumption of the internal power supply and current available in VOUT
Ex.
Accessory
(2)
SLOT A
SLOT B
SLOT C
SLOT D
SLOT E
SLOT F
SLOT G
I
ACC
I
OU T
1
Model
REL-01
0.05 A
0.75 A
Consumption
0.05 A
2
Model
REL-01
TEMP-01
CCAN-W
ENC-01
0.30 A
0.50 A
Consumption
0.05 A
0.05 A
0.00 A
0.20 A
3
Model
REL-01
TEMP-01
CCAN-W
ENC-01
IOAI-01
IOD-01
IOD-01
0.40 A
0.40 A
Consumption
0.05 A
0.05 A
0.00 A
0.20 A
0.10 A
0.00 A
0.00 A
4
Model
REL-01
TEMP-01
ENC-01
ENC-01
IOAI-01
IOAI-01
IOAI-01
0.80 A
0.00 A
Consumption
0.05 A
0.05 A
0.20 A
0.20 A
0.10 A
0.10 A
0.10 A
5
(1)
Model
ENC-01
ENC-01
IOAI-01
IOAI-01
IOAI-01
IOAI-01
IOAI-01
0.90 A
-0.10 A
(1)
Consumption
0.20 A
0.20 A
0.10 A
0.10 A
0.10 A
0.10 A
0.10 A
(1)
In this example, the capacity of the internal power supply was exceeded, being necessary to use an external power supply as
(2)
Prefix “CFW900” has been omitted.
✓
NOTE!
If it is necessary to use an external power supply because the consumption of accessories and loads
connected to VOUT is greater than 0.8 A, make sure that the external power supply is energized
before or at the same time as the inverter, and that the inverter is de-energized before or together
with the external power supply.
3.2.6.2 Use of a 24 Vdc External Power Supply
The external power supply operates redundantly with the inverter internal power supply and allows the control,
communication and accessory circuits to remain active (powered and responding to commands) even with the
power circuit de-energized.
The inverter indicates the “Poff” state when the control power is active and there is no voltage on the inverter DC
link. The use of the external power supply is also necessary if the total current drawn by the accessories is greater
than the capacity of the inverter internal power supply, as explained in item
When the external power supply is energized, the inverter control circuits, accessories and loads connected to
the VOUT output of XC1 draw current from the external power supply. This way the loads in VOUT will also have
redundant power.
Follow the next steps to size the external power supply:
CFW900 | 43
Summary of Contents for CFW900
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