Specifications

Southwestern Industries, Inc.

ProtoTRAK SMX K2, K3, K4 & Retrofit Safety, Installation, Maintenance, Service & Parts List Manual

• Touch off a fixed point on the table and set the DRO to 0.

• Traverse away approximately 6 inches.

• Return the touch off again.

• Write down the reading on the DRO.

• Do not Re-zero the DRO, traverse away and return several times.

• Write down the DRO readings

Random error will be unpredictable and give scattered readings, adding and/or subtracting

the error after each traverse with no pattern. See Step 2.

Accumulating error will add roughly the same amount to the reading after each traverse.

See Step 3.

2. For random error, look for problems in the set-up of the glass scale that have resulted in

a loss of rigidity. Common sources of random error include:

• Loose scale mounting hardware.

• Loose reader head.

• Very loose motion of the table or saddle.

• Loose cable connection

3. Accumulating error is commonly the result of:

• Scale out of parallel to the axis travel.

• Dirt or chip on the glass scale.

• Broken glass.

4.7 TRAK Sensors

TRAK Sensors are used on the X and Y-axis for secondary feedback. They are optional on

the TRAK SMX knee mill machines. The following section talks about some of the common

symptoms associated with a problem sensor and how to isolate or fix the problem.

Common symptoms

• Faulting Axis

• The DRO measurements do not repeat

• The DRO measurements are not accurate

Objectives:

• To determine if the TRAK Sensor is bad and needs to be replaced.

• To determine if there is a problem with the sensor set-up

4.7.1 Faulting Axis

If a sensor has stop reading and you try to move an axis, the axis will run away and fault.

Our control uses the counts from the sensor and motor when reading position. If either one

of these signals is not working our system will fault.

1. The first thing that can be done to see if the sensor is at fault is to turn off the sensor on

the axis in question. This will allow the system to run only on the motor encoders. If the

fault continues then the sensor was not the problem. Turn the sensor back on. See the

service code section for a codes needed to turn the sensors on and off. Also, run code

100.