Resistor Bank Question?We are builing a bar loader with a 15HP motor and a Allen Bradley 525 Drive. The Gearbox is a 14RPM output. We hve to pick up bundles of steel that weighs 13,000LBS. The bundles are suspended in the loader and the operator pushes a up or down button and makes the loader operate. My question is, when the... | |
You should consider using the electromagnetic brake control feature. That involves stetting Parameter 45 [Stop Mode] to option 8 or 9 and setting a relay or relay-driver output to control the energization of the brake (t081). You can then control the time that the brake release is delayed before the acceleration ramp begins (t086) and the time of brake application at the completion of the deceleration ramp before the drive stops (t087). Perhaps Allen Bradley has an application note that explains that in more detail that it is explained in the manual.
I hope "brake releases" and "moving" are the correct words. You don't need a resistor bank, you need a delay circuit on the brake release so the motor takes the load off the brake.
The motor's torque is not enough to hold the starting load . Adding resistor to it makes it worst .
The brake is releasing too soon. There may be an adjustment to the worn pads to prevent this. Ask the manufacturer or refer to the operators or service manual for brake adjustments.
