Retrofitted hoist machine

A method of retrofitting a legacy hoist machine,

• the legacy hoist machine including:
• a bedplate;
• a machine shaft extending from an axial first end to an axial second end, the machine shaft having a first end surface;
• a first bearing supporting the first end of the machine shaft, and a first support extending from the bedplate to the first bearing;
• a second bearing supporting the second end of the machine shaft, and a second support extending from the bedplate to the second bearing;
• a drive sheave axially between the first and second bearings of the machine shaft;
• a brake drum axially between the drive sheave and the first end of the machine shaft and integrally connected to the machine shaft;
• a legacy brake assembly that operates as the only brake assembly for the legacy hoist machine prior to attaching an additional brake assembly, the legacy brake assembly being axially adjacent to the drive sheave and configured to engage the brake drum, wherein the legacy brake assembly includes one or more external brake arms configured to apply braking through a respective one or more brake shoes and a solenoid configured to control the one or more brake arms, wherein prior to attaching the additional brake assembly, the legacy brake assembly is controlled as a primary brake assembly,
• the method including:
• attaching the additional brake assembly to the first end surface of the machine shaft, by fasteners that extend into the first end surface of the machine shaft, so that the first bearing is between the additional brake assembly and the brake drum, and
• configuring a controller to:
• control the legacy brake drum as a secondary brake assembly rather than the primary brake assembly to thereby apply emergency braking,
• control the additional brake assembly as the primary brake assembly to provide service braking, and
• wherein the additional brake assembly includes a stub shaft with a first end connected to the first end surface of the machine shaft by the fasteners, a disk brake assembly connected a second end of the stub shaft, and a torque limiting support frame supporting the disk brake assembly between one of the bedplate and the first support.