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[Required Number of Power Supply Units]
1. Calculate the required number based on the total rated current obtained on the previous page and
the rated output current of the used power supply. --- (A)
2. Calculate the required number from the total peak current obtained on the previous page and the
peak output current of the used power supply. --- (B)
3. The required number of units is the number obtained in (A) or (B), whichever is larger.
Selection example for PSA-24/PSA-24L
Number of connected units
Rated output current [A]
Peak output [A]
(Example 1) Model without rated current notation
· When five sets of PCON-CB (PIO spec.) and RCP5-RA7R (56P: high-output setting disabled)
are connected and servo is turned ON at the same time
<Rated current>
2.2A x 5 = 11.0A >
< 15.3A ⇒ PSA-24: 2 units required
(1)
Power supply current
* The controllers that include control power supply current (1) in "Power Supply Current" of the PCON-CB
table do not require separately adding the control power supply current of the controller.
<Peak current>
Calculation is not required.
(Example 2) Model with rated current notation
· When four sets of ACON-C (fieldbus specification) and RCA2-SA3C (10W) combinations are
connected and servo is turned ON at the same time
<Rated current>
1.3A x 4
+
0.3A x 4
(1)
(2)
Power supply current
Control power supply current
<Peak current>
4.4A x 4
+
0.3A x 4
(1)
(2)
Power supply current
Control power supply current
The controllers that include control power supply current (1) in "Power Supply Current" of the ACON-C
table require separately adding the control power supply current of the controller (2). If the controller is
fieldbus specification, another 0.3A (3) is added.
When the same operation is performed with multiple actuators at the maximum load and the
maximum acceleration simultaneously
Although the rated current is within 8.5 A, the peak current exceeds 17 A, making the capacity
of one unit insufficient and requiring two units connected in parallel.
However, by satisfying the following two conditions, it is also possible to operate with one unit
connected.
· Shift servo ON timing.
· Do not perform the same operation with multiple actuators at maximum load and maximum
acceleration simultaneously.
11.2 Connected Unit Count Determination Method
1
2
8.5
15.3
22.95
17.0
30.6
45.9
8.5A ⇒ Insufficient capacity
0.3A x 4 = 7.6A < 8.5A ⇒ PSA-24: 1 unit required
+
(3)
Fieldbus
0.3A x 4 = 20.0A > 17.0A ⇒ Insufficient capacity
+
(3)
Fieldbus
3
4
5
30.6
38.25
61.2
76.5
< 30.6A ⇒ PSA-24: 2 units required *
11-10
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