630 Chair Rotation Brake Function, Optional Troubleshooting
This illustration shows only the components that affect the Rotation Brake function.
Power to Brake Switches and Electro-magnet
The Power Supply PC Board supplies approximately 12 VDC to the two normally closed brake switches.
The electro-magnet is supplied with voltage from J4 which is supplied through F8 and F7 on the Power Supply PC Board. The voltage is dependent upon what the software tells it to be. Theoretically, the voltages are to be +24 VDC for 1 second right after activating the unlock, then 12 VDC until the lock occurs. The measured voltage will depend upon what value the +24 VDC is actually at.
Rotation Base Locked
The two brake springs press upward on the brake lever. This pivots the brake lever so that pressure is applied to the brake pad assembly. This prevents the brake disk from rotating.
To unlock base rotation press and release either brake pedal.
The brake pedals will not unlock the base while any of the motors are running.
Rotation Base Unlocked
When either brake pedal is pressed and released, the corresponding brake switch opens. When the open switch is detected, the PC board supplies voltage to the electro-magnet.
When voltage is applied to the electro-magnet, the magnet’s pull overpowers the brake springs. This removes pressure from the brake pad assembly allowing the brake disk to rotate.
To lock base rotation press and release either brake pedal.
The Base automatically locks in place after one minute.
