BEM Models

BEM-2H/4H types take a commercial power supply as the input and generate a half-wave rectified DC voltage on the output side. These power supply devices are known for their very simple construction and low cost, but their voltage pulse is large. They are therefore prone to generating variations in operating response in electromagnetic clutches and brakes, they produce a howling noise when conducting, and they tend to generate more heat from their electromagnetic coils than full-wave rectified supplies or smoothing supplies.
When the above are to be avoided, consider changing to a full-wave rectified supply (BEM-2F types), smoothing supply, or a DC 24 V specification. BEM-2F types generate a full-wave rectified DC voltage. These power supply devices are known for having smaller voltage pulses than halfwave rectified supplies and tending to have little variation in electromagnetic clutch and brake operating response.
[Method for Calculating Output Voltage]
Output voltage = Input voltage × a (a set coefficient)
* a (set coefficient) = 0.45: half-wave rectified/0.9: full-wave rectified
(Ex.)
BEM-2H, -4H: 200 V AC×0.45 = 90 V DC
BEM-2F: 100 V AC×0.9 = 90 V DC
Note that the electromagnetic clutches and brakes will not operate at the performance specified by the specifications unless the output voltage calculated above and the rated voltage for the electromagnetic coil are the same.