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a. Pushbuttons
All "START" pushbuttons are solid black or green. "STOP" pushbuttons are solid red with extended heads. All boom "EXTEND & RETRACT" pushbuttons are solid black flush head type. All pushbuttons are oil-tight, heavy duty type switches with a NEMA rating of 12 unless specified differently.
b. Motor Starters
All motor starters are normally of the "00" or "O" sizing. They each have provisions for auxiliary contact. They each have a mechanical interlock. Each overload relay used for fusing the starter has single phase protection; it is ambient compensated, has a manual test button and a manual or automatic reset device. The trip indicator is adjustable within the amperage range of the overload relay.ADJUSTMENTS SHOULD ONLY BE DONE BY QUALIFIED ELECTRICIANS.
c. Limit Switches
All limit switches are precision oil tight switches meeting a NEMA 4 rating. Most are of the plug-in type for easy replacement. Contactors have a rating of 10 amperes, 120 volts for continuous duty.
d. Relays
An optional device which is sometimes used depending on the application is a relay. The time delay relays are industrial type pneumatic relays with an adjustable time delay to meet the application. Relays are mounted in the master control panel.ADJUSTMENTS SHOULD ONLY BE DONE BY QUALIFIED ELECTRICIANS.
Operating controls for the Stewart Glapat conveyor are located at two separate locations: the master control panel, and the head end of the extendible sections. Additional controls may be supplied and located at nearly any location on the conveyor depending upon the customer requirements. Check the electrical schematic and other pertinent assembly information in the drawing package for all locations of controls and pushbuttons. Control stations are NEMA 12 unless specified differently.
The circuit breaker on the master control panel allows power to be applied to the control circuit and the power circuit. The belt "START" and "STOP" pushbutton switch on the head end of the first boom allow the motion of the belt to be controlled.
The circuit breaker on the master control panel, in addition to applying power to the conveyor belt control circuits, also allows power to be applied to the boom "EXTEND" and boom "RETRACT" push buttons. These buttons control the power to the telescoping boom control starter circuit. The boom "EXTEND" and "RETRACT" push buttons are located on the head end of the extendible conveyor called the first boom. They allow the booms to be extended or retracted as long as the button is held in. "EXTEND" and "RETRACT" limit switches are incorporated in the conveyor to prevent overtravel of the telescopic booms.
ALL GUARDS MUST BE SECURELY ATTACHED PRIOR TO OPERATION.
ALL MOVING PARTS ARE DANGEROUS AND SHOULD NEVER BE TOUCHED WHEN IN MOTION
The conveyor features several safety controls and switches which reduce the hazards.
a. Belt "STOP" Button
The belt "STOP" button is a red type extended head pushbutton, located on the front of the conveyor. Pressing the button will stop the motion of the conveyor belt at any time, no matter what other controls might be tied into the belt circuit. Additional buttons may be supplied (see schematic).
b. Power Lock Out Device
The main electrical panel incorporates the means for locking the power completely off the conveyor. Any time the conveyor is being serviced or repaired this device should be used. It is located on the disconnect switch on the master control panel. By turning the main power disconnect to the "OFF" position, any standard padlock can be placed in the handle opening. Once the padlock is in place and locked, the disconnect will not allow the power to be turned on until the lock is removed.SINGLE KEY LOCKS SHOULD BE USED BY QUALIFIED ELECTRICIANS OR MAINTENANCE MECHANICS. WHEN POSSIBLE, AN ADDITIONAL POWER LOCK-OUT AT THE POWER SOURCE IS RECOMMENDED.
c. Traverse Safety Platform
This device is featured only on conveyors with a powered traverse feature. It is located under the platform directly below the master control panel. This switch requires the operator to be standing on the riders platform before the conveyor will traverse in either direction. The operator must first stand on the platform and then operate the directional control switch to move the conveyor. A VISUAL INSPECTION OF THE AREA OF TRAVERSE SHOULD BE MADE SO AS TO AVOID HITTING ANY PRESON, OBSTACLE, OR DEBRIS.
d. Safety Bar
A safety bar is installed across the end of the telescoping boom. Contact of the bar with a resisting object actuates a limit switch and causes the booms to stop extending. Removing the pressure on the safety bar deactivates the limit switch.
An optional feature that can easily be adapted to the extendible conveyor is the ability to interlock with feed and takeaway conveyors. Check the electrical schematic of your application. MAKE SURE THAT INTERLOCKS WILL NOT START OR RESTART ANY FUNCTION, UNLESS A BUTTON IS PRESSED ON THE MACHINE BY THE OPERATOR.
