i950 all TAs: Holding brake: Brake test function (from V01.06.04)
Function extension:
New brake test function to check the motor holding brake for function and wear.
In principle, it is checked whether the holding brake can still apply sufficient holding force to be able to hold the active load (hoist) safely. For this purpose, a defined torque is built up via the motor against the closed holding brake and the movement of the motor shaft is observed via the feedback system. It should be possible to hold the motor shaft at standstill. Detected movements of the motor shaft should be at most in the order of magnitude of the existing play and torsion of the mechanical components, i.e. in the range of angular degrees.
The test torque is built up via a ramp generator and held for a specified holding time. This checks whether the motor shaft can be twisted and the brake slips. Afterwards, the test torque is reduced again and the inverter is disabled again (controller inhibit).
Related parameters:
0x500A:122: Brake test mode (test torque pos./neg. direction; with/without active load)
0x5025:010 Bit7: Start with rising edge.
0x500A:123: test torque
0x500A:125: Ramp Generator Ramp-up Time
0x500A:126: Holding time
Brake test modes:
0x500A:122 = 1: Test torque in positive direction: Test torque = (+) Test torque 0x500A:123
0x500A:122 = 2: Test torque in negative direction: Test torque = (-) Test torque 0x500A:123
0x500A:122 = 3: Test torque in positive direction, with active load (e.g.: hoist): Test torque = (+) Test torque 0x500A:123 + Holding torque
0x500A:122 = 4 Test torque in negative direction, with active load (e.g.: hoist): Test torque = (-) Test torque 0x500A:123 + Holding torque
Brake test modes 3 and 4 are designed for hoist applications (active load).
The holding torque required to hold the hoist load is determined at the start of the brake test and then taken into account when the test torque is output ('load compensation'). In the first step, the inverter is released, the brake is released and the holding torque required to hold the load is determined.
The test torque to be output is calculated from the parameterised test torque, the parameterised direction and the determined holding torque.
Note: The holding torque can be a positive or negative value, depending on the effective direction of the active load, independent of the parameterised brake test mode.
Enthalten in welchen Produkten? Servo Inverter i950 FW: as of V01.06.04.2154
Application:
Use in machines and systems in which motors with holding brakes are installed in order to detect their wear in good time or to carry out maintenance.
The function can be executed during "operating pauses" of the machine/plant.
