Turret brakes

13feb18

How the brakes work
Debugging brake problems

180211: turret brakes fail. Current sensor not reaching correct current level.


How the brakes work (top)

 
    There are 2 turret motors (master and slave). Each motor has a brake. The brakes are spring loaded to the on position. Before moving the turret these brakes must be released (pulled back). This is done using solenoids. A current monitor is used to measure the current through each solenoid. When the current rises above a preset value, the brakes are "released".


Debugging brake problems

    The monif program can be used to debug brake problems. It updates once a second. The image below is a screen shot of the program running:

monif screen shot


When a brake problem occurs, it will typically show up in the TurFlt line with BrkFail.

The image below shows the turret brake schematic:
turret brake schematic

Ref
monif
Line
bits
(cntFrom0)
MonIf
label
Notes
A
TurOLs
B8
BrkOffCm
Brake off command. Analog output to release brakes.
B
TurDI2
B11
BrkOffCM
Monitors the brake off command going  to the releaseCoil.
C
TurDI3
B7
BrkOffMon
Monitors the output of the brake current sensor going to the IsReleasedCoil has reached the correct current level.
D
TurDI1
B12
BrkOffMn
Monitors that the IsReleasedCoil is working correctly
E
TurDI3
B14
BrkOffCmdc
Monitors that the ReleaseCoil is working properly.
F
TurDI3
B6
IlKey
Monitors the turret interlock key. If set, then turret can not be moved


Debugging steps.

If any of the inputs are not working, first check the opto isolators for that bit ( since they tend to fail first)..
Note that the specified bits count from 0, not 1.

processing: x101/180212/turretbrakes.xcf (used by gimp program).


180211: brake fail, current sensor level.

    On 11feb18 there were turret brake failures.

Turret status during brake failure (.ps) (.pdf)

The current sensor was readjusted, and will be replaced.

processing: x101/180212/turbrkfail.pro



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