Following Power Moller units (with some modefications depending on the motor type) are UL recognized:

Thermally protected motor (ZP) File #104167
PM570/605AS series (with a thermal device on the coil windings)
1phase 115V: registered as A-11U
3phase 220V: registered as A-22U
PM570/605AH series (with two thermal devices)
3phase 220V: registered as AH-22U

Impedance protected motor (IP) File #104170
PM570/605AU series (without any modification)
3phase 220V: registered as AU-22U

Yes. Brakes are one of the popular options available on many Itoh Denki Power Mollers. They can eliminate load inertia and enable precise stopping. The electromagnetic brake is engaged by spring force when power to the motor is interrupted.

Examples of applications include:

a) In automated conveyor lines, it is sometimes necessary to precisely stop or position the article being transferred. In these, the optional built-in electro-magnetic brake should be used.
- when no powered, the built-in electro magnetic uses spring force to lock the motor and prevent the tube rotation. The motor is released when the brake is powered (energized). Ordinarily, the power to the brake and motor is controlled simultaneously.
- In most cases, an external mechanical stop can be eliminated by using Power Moller with the built-in brake. However, the stopping distance may vary slightly depending on the load, speed, etc.

b) In gravity lines, it is often necessary to control the descent of the load to prevent damage to the articles accumulated at the end of the line. In this case, the standard Power Moller can act as a brake roller.
- when the rotation speed of the power Moller is increased by 10-20% from its nominal speed, it functions as an induction generator and braking torque is applied to the load.
- By incorporating Power Moller at several points in a self-traveling gravity line, speeding or congestion of the load will be prevented.

Since the Power Moller 24 DC models come standard with dynamic braking, the mechanical brake is made to operate in conjunction with the dynamic brake. In operation, the dynamic brake is used to slow the Power Moller 24, at which point the mechanical brake engages for a more positive hold. The mechanical brake will stay engaged even in the event of a power failure. Using this two-process brake feature will extend brake life.

Maximum continuous energized time is 30 minutes with a 70% duty cycle. Braking characteristics can vary by Power Moller model and weight transferred. Contact ITOH DENKI for additional information.

The bottom surface can greatly affect a Power Moller performance.

Some concerns are:
a) If the bottom surface of the load is not flat or conveyor rollers are not level, then the Power Moller may rotate freely and the load may not be transferred or may tend to drit.
b) Transferring light load (less than 5kg) may be impeded by the resistance of idler rollers. Check to be sure that the idlers spin freely and investigate the use of slave driving non powered idler rollers.
c) Due to the packing (binding) bands, bulging of the bottom of the load, etc., the load my lean to one side during transfer. The use of each end sectional rubber laggings on the Power Moller would facilitate a straight transfer of the load.

Tangential force is obtained by the formula torque (kg) divided by roller radius (cm). For instance, if you put 3mm rubber lagging on PM570AS-15 (57mm diameter roller), the resulted tangential force will be smaller because the radius becomes larger:

Torque of PM570AS-15 is 12.6kgcm
Radius of the roller with 3mm lagging is 3.15cm
12.6kgcm÷3.15cm = 4.0kg (tangential force of PM570AS-15 without lagging is 4.4kg)