Amada Miyachi Unitek STA-100A, Operation Manual, Page: 65 / 154

STA SERIES AC CONTROLS
990-351 5-1
Chapter 5
MAINTENANCE
Section I: Precautions
WARNING
Never attempt to repair the Control with power applied. DEATH may result from contact with lethal
voltages inside the Control .
Turn power to the unit OFF before starting maintenance work. Tag (and preferably lock) the switch so
that power is not accidentally restored.
Precautions

Read through the entire specific instructions, including all caution and warning messages,
before starting any maintenance procedure.

Other than as indicated in Appendix K, Circuit Modification for External Transformer
Thermostat, do not modify the unit without prior written approval from Amada Miyachi
America.

Use the appropriate tools for terminating the connecting cables, being careful not to nick the
wire conductors.

Never use paint thinner, benzene or acetone to clean the exterior of the Control. Use a dry
cloth or, if it is heavily soiled, use a cloth moistened with a mild detergent or alcohol.
Section II: General Information
General Maintenance Procedures
1 Open the door by rotating (CCW) the front panel screw securing the door.
2 Rotate or pull the circuit breaker handle and open the door.
3 Repair is by replacement of components. Find the specific item(s) you want to repair or
upgrade in
Section III, Standard Components Replacement or Section IV, Optional Components
Replacement , then follow the procedures listed.
Cooling Maintenance-Water Draining
CAUTION : To protect the equipment (SCR and hoses) the water should be drained at any time when
there is a chance that it might freeze. The water should also be drained and the hoses and SCR cooling
chamber flushed any time you believe that there is a build-up of sediment that might decrease the water
flow and cause the unit to overheat.