Miki Pulley BEM Models
Specifications
| Model | BEM-2H | BEM-4H | BEM-2F | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Input voltage | AC100V | ± 10％ 50/60 Hz |
● | ● | ● | ||||
| AC200V | ● | ● | ● | ||||||
| AC400V | ● | ||||||||
| Maximum input voltage | AC250V | AC510V | AC250V | ||||||
| Rectification method | Rectification method | Half-wave rectification | Full-wave rectification | ||||||
| Output voltage | DC45V | DC90V | DC45V | DC90V | DC180V | DC90V | DC180V | ||
| Output current | When the ambient temperature is 20℃ Values in () are for an ambient temperature of 60℃ | DC1.0A (DC0.6A) | DC1.0A (DC0.6A) | DC1.0A (DC0.6A) | |||||
| Output Wattage | When the ambient temperature is 20℃ Values in () are for an ambient temperature of 60℃ | 45W (25W) | 90W (50W) | 45W (25W) | 90W (50W) | 180W (100W) | 90W (50W) | 180W (100W) | |
| Size setting | Voltage specification Numbers in parentheses are input voltages | DC45V (AC100V) | DC90V (AC200V) | DC45V (AC100V) | DC90V (AC200V) | DC180V (AC400V) | DC90V (AC100V) | DC180V (AC200V) | |
| ●: Applicable △: Applicable depending on clutch/brake model | 01 | ● | ● | ● | ● | ● | ● | ● | |
| 03 | ● | ● | ● | ● | ● | ● | ● | ||
| 04 | ● | ● | ● | ● | ● | ● | ● | ||
| 05 | ● | ● | ● | ● | ● | ● | ● | ||
| 06 | ● | ● | ● | ● | ● | ● | ● | ||
| 08 | ● | ● | ● | ● | ● | ● | ● | ||
| 10 | ● | ● | ● | ● | ● | ● | ● | ||
| 12 | ● | ● | ● | ● | ● | ||||
| 14 | ● | ● | ● | ● | ● | ||||
| 16 | ● | ● | ● | ● | ● | ||||
| 18 | △ | △ | ● | △ | ● | ||||
| 20 | △ | △ | △ | △ | ● | ||||
| 25 | △ | △ | △ | △ | ● | ||||
| Applied clutches/brakes | MIKI PULLEY electromagnetic-actuated clutches and brakes Rated voltage DC 45/90/180 V | Spring-actuated brake | |||||||
| Insulating resistance | Between terminal and body | DC 500 V, 100 M Ω with Megger | |||||||
| 1500 V AC, 50 Hz, 1 min. | 2200 V AC, 50 Hz, 1 min. | 1500 V AC, 50 Hz, 1 min. | |||||||
| Usage environment | With no condensation | －15～＋60℃ | |||||||
| Mass | Per product | 0.020 kg | 0.021 kg | 0.023 kg | |||||
Dimensions
Structure
Terminals and Functions
| Terminal | Function name | Function description |
|---|---|---|
| Leads (two) | Input side | Connector for a commercial power supply |
| Tab terminals (two locations) | Output side | Connector for an electromagnetic clutch or brake |
Characteristics
Use of both half-wave rectification and full-wave rectification
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.
Wiring methods and timing charts
Primary control
Secondary control
