While the rated output current is 8.5A, maximum momentary output current of up to 17A is supported.
This lets you select an appropriate power-supply capacity based on the total rated current of actuators, without having to consider the maximum momentary current that may be generated by the actuator during acceleration.
Because you no longer need to use an expensive high-capacity power supply, cost can be reduced substantially.
* The maximum momentary output current must be considered if the actuator operating conditions are tight.
For details, refer to "Selection Guide" on the right.
Supporting Parallel Operation
Up to five units can be operated in parallel.
Even if any one unit is found short of power-supply capacity, all you need is to simply add one more unit without replacing the unit in question with a larger-capacity model.
Load Detection Function
The load factor can be detected using the RDY (ready) indicator lamp and RDY output signal.
Selection Guide: Number of Actuators Connected
When selecting a power-supply unit for operating multiple actuators, normally a unit with a capacity equal to or exceeding the total maximum current of all actuators is chosen.
However, actuators generate their maximum current only momentarily during acceleration, etc., and in many cases the power-supply is over-specified.
On the other hand, the PS-24 power supply provides the following advantages:
- Supporting maximum momentary current of up to twice the rated current
- If you need more power-supply capacity, you can simply add an extra unit or units. The above features let you select an optimal power-supply capacity.
Number of Power-supply Units
Basically, how many power-supply units you need should be determined in such a way that the total rated current of all actuators will remain within the rated current of the PS-24.
If the load condition is tight, however, the power-supply capacity may still become inadequate. In such cases, add an extra power supply or supplies.
Examples of Tight Load Condition
- Large load (close to the rated load capacity of the actuator)
- High acceleration/deceleration
- High speed
- Simultaneous operation of multiple axes
- Use of the RB75 series (Structurally these actuators allow maximum current to flow for a longer period.)
Table 1. Rated Current of PS-24 and Allowable Maximum Momentary Current
| Number of Connected Units |
Rated Current [A] |
Maximum Momentary Current [A] |
1 unit |
8.5 |
17 |
2 units |
15.3 |
30.6 |
3 units |
22.95 |
45.9 |
4 units |
30.6 |
61.2 |
5 units |
38.25 |
76.5 |
(Note) Consider a safety factor (loss) of 10% for the second and subsequent units.
Table 1. Relationship of Actuator and Power-Supply Current
Controller Type |
Actuator Type |
Power Supply Current [A] |
Number of connected axes per PS-24 (reference) *1 |
ERC2 |
ERC2 |
Rating (=Max) |
2A |
8 |
PCON/PSEL |
All RCP2 Models |
|
ACON/ASEL |
SA4, SA5 (20W) |
Rating |
1.3A |
6 |
Max. |
3.7A |
SA6 (30W) |
Rating |
1.3A |
6 |
Max. |
4.2A |
|
RA3 (20W) |
Rating |
1.7A |
5 |
Max. |
5A |
| RA4 (20W) |
Rating |
1.3A |
6 |
Max. |
3.7A |
| RA4 (30W) |
Rating |
1.3A |
6 |
Max. |
4.2A |
*1 The figures under "Number of connected axes per PS-24 (reference)" are calculated based on the assumption of "Rated current of axis x Number of axes [Rated current of PS-24 (8.5A)" [or "Rated current of axis x Number of axes [Maximum momentary current of PS-24 (17A) for ERC2 and RCP2].
