Ingersoll-Rand Intellisys SSR 10-40, Руководство для обслуживающего персонала

Страница: 92 / 107

Replacing the stepper motor or limit board:
When replacing the stepper motor or limit switch board, remove the stepper
motor assembly from the valve body. Remove the male coupling from the
stepper motor shaft. Disconnect the leads going to the board or motor. Replace
the old component for the new one on the stepper mounting plate. Be sure to
replace the stand-off nuts between the limit board and stepper mounting plate.
Leaving the extra nuts out will usually cause a short circuit. Take care to use only
minimal torque when attaching a new limit board. Too much torque may crack
the board and cause it to malfunction.
Reassembly:
Prior to reassembly, inspect the limit switch board for any signs of physical
damage, contact at the limit switches or "burned" looking areas. Replace with
a new limit board if any physical damage is seen. Always replace both halves
of the coupling if either side shows appreciable wear. Check that the inlet valve
rotates freely. The female coupling should not touch the stop when the valve is
fully closed, although it will touch the opposing stop if you open the valve far
enough. On the stepper motor, check that the male coupling is square on the
shaft and rotates freely through both limit switches without any contact. The
bottom of the spine should move through the limit switches at or below the base
of the grooves that face each other inside the limit switches. Make note of how
the motor resists with small "detentes" as you rotate it. Verify that all electrical
connections are secure. Also check the gasket for damage and replace if
necessary.
Rotate the male coupling so that its spine is in the center of the closed limit
switch. Close the inlet valve. Replace the stepper motor assembly back onto
the inlet valve housing.
After tightening the bolts that secure the stepper motor assembly to the inlet
valve housing, rotate the inlet valve. You should feel the same type of slight
resistance "detentes" in both directions as when rotating the stepper itself. If it
seems loose, moves sloppily or jams in any one position then the assembly is
in need of further repair. Try reassembling unit.
Once the assembly is complete, observe the inlet valve while an assistant turns
the power on to the machine. The valve should go full open, then nearly full
closed (leaving a slight crack) and stop. Now ask the assistant to press the Start
Button on the Intellisys panel. Watch the butterfly valve closely. In Star-Delta
starting units the valve should move quickly from near closed position to full
closed position at the moment the start button is pressed. You will hear the
machine accelerate to speed. The valve should not move during this accelera-
tion. Once starter transition takes place the valve should open just a crack once
again. Units which employ full voltage starters simply stay slightly open
throughout start-up.
After it is clear that the inlet assembly is operating properly, replace the inlet filter
element(s).
SSR 50-450 HP
CHECK MOTOR ROTATION SHUTDOWN
This alarm will occur if the unit is started and 1AVPT transducer sees less than
1 psi vacuum. The alarm is not checked during the first two seconds of
operation. If the alarm occurs, make repairs by using the following procedure:
1. Make sure that the rotation is correct (clockwise looking over the non-
drive end of the motor).
2. Make sure that both ends of the flex tube are cut off squarely and dip
the ends of the tube in Ultra Coolant to insure that there is a good seal
in the fittings on the airend and on the transducer.
-87- -88-