R&M Materials Handling WIRE ROPE HOISTS Service - Manual (Page 12)

R&M Materials Handling, Inc.
4501 Gateway Boulevard
Springfield, Ohio 45502
P.: (937) 328-5100
FAX: (937) 325-5319
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R&M Materials Handling, Inc. reserves the right to alter or amend the above information without notice.
the crane operator variable speeds to minimize swing, reducing the slowdown ramp time to stop, providing
safer and productive operation.
• Position 2: Accelerate to high (maximum) speed
!
Inverter Drives provide state of the art control in the hoist, bridge and trolley motions of
industrial cranes. A skilled operator can benefit from this type of control system. Note an
established acceleration or speed up ramp time will minimize the motion from achieving full
speed instantly, minimizing load swing. Position 2 is the High speed command but the
ramping time to full speed allows the operator to hold any speed between Low and High by
returning to the first position, commanding - HOLD SPEED.
!
NOTICE: when the pushbutton is returned to neutral, an established deceleration or
slowdown ramp time is in full control of the motion before STOP. A skilled operator can use
this ramp time to his advantage by pushing in position 1, to command HOLD SPEED. The
motion will hold the speed the motion has slowed down to.
!
EMERGENCY STOP WILL ALWAYS STOP MOTION IMMEDIATELY!
3.5.3 Using the pushbuttons (two speeds, controlled by Inverter)
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A. Position of pushbutton (0, 1 and 2)
B. Speed
Two step pushbutton - Low and High Speed with Soft Starting and Soft Stopping
The position of the pushbutton affects the speed as follows:
• Position 0: Neutral Position. Controls motion to slowdown and stop.
• Position 1: Accelerate to low speed.
• Position 2: Accelerate to High speed.
!
Frequency Inverter Drives provide state of the art control in the hoist, bridge and trolley
motions of industrial cranes. This simple control has two speeds, Low and High, but with
the advantage of speeding up smoothly to minimize swing. When returning to Low Speed or
Stop a smooth slowing down occurs to minimize swing.
!
NOTICE: when the pushbutton is returned to neutral, an established deceleration or
slowdown ramp time is in full control of the motion before STOP.
!
EMERGENCY STOP WILL STOP MOTION IMMEDIATELY.