Such Solenoids are designed to operate from a 24Vdc supply with a relay/contactor doing the enable/disable
This can be seen from the nominal data (recommended)
100% duty, ie DC. Likewise if you look at the nominal resistance for each variant and the associated nominal current
If you factor in a bit of contactor resistance, they align.
That doesn't mean you cannot PWM this coil
These proportional solenoids are designed to provide an almost linear relationship between current and force and as such their usage is considering varied current.
How can the current be varied?
- Linear output stage (ClassA). Viable but extremely lossy
- PWM. Duty ~ voltage ~ current
But what is the optimal switching frequency? There isn't enough data from the part provided or from other constraints. With increase switching frequency there is a reduction in ripple current which will improve the peak-peak of the current waveform. However, with an increase switching frequency comes increase losses from the PWM stage and also the solenoid's core. At some point there is no net benefit in increasing the switching frequency anymore ( Selection of PWM switching frequency in BLDC motor) as there is no more system benefit while the disadvantages (losses, timing) become tighter and tighter.
There is one other consideration... the core of the solenoid. It does not say whether it is solid or laminated. If it is solid (typical for DC-fed solenoids as it is cheaper) then PWM'ing the coil will cause you more problems as the eddy currents due to the MMF of the applied PWM voltage will result in a massive reduction in terminal inductance ( at least 1/100th ) and thus your ripple current will actually become worse.
How to choose? define your constraints
- noise (electrical and audible)
- force ripple
- circuit complexity
from these you can hone in on the "optimal" switching frequency. If such constraints cannot be derived, try 10kHz... if aspects are not ideal try 20kHz, if they get worse, try 5kHz. TYPICALLY it is easier to derived the frequency from conceptualise the constraints but if such constraints cannot be derived then empirical testing to determine if it is "good enough" is acceptable for some industries