Manitowoc Published 04-06-18, Control # 231-14 6-17
MLC650 VPC-MAX™ OPERATOR MANUAL MAINTENANCE
Checking the Beam in and Out Limit
Switches
See Figure 6-13 for the following procedure.
REMINDER: The rear of the VPC-MAX beam must be
supported by pendants from the assist crane (Figure 6-10
)
so that the rotating bed pins are centered in the beam hooks.
1. Verify that both beam limit switch levers are installed
parallel to the limit switch housings.
2. Using the remote control, travel the actuator IN until the
beam IN tripping plate (2, View A) trips (clicks) open the
beam IN limit switch (3).
The trolley should be at the dimension (4, View B): 409
mm (16-3/32 in) between the physical stop (4a) and the
actuator roller (4b).
If necessary adjust the limit switch mounting brackets (5)
so the limit switch trips open at the specified dimension.
3. In the main display (Figure 6-9 on page 6-12
), the beam
IN icon should be tripped.
If the icon indicates that the limit switch is NOT
TRIPPED, troubleshoot the electric control system and
fix the problem.
The actuator IN limit switch must TRIP open when it
contacts the actuator IN tripping plate.
4. Using the remote control, travel the actuator OUT until
the beam OUT tripping plate (6, View C) trips (clicks)
open the beam OUT limit switch (7).
The trolley should be at the dimension (8, View D): 147
mm (5-25/32 in) between the wear pad retainer (8a) and
the actuator bracket (8b).
If necessary adjust the limit switch mounting bracket so
the limit switch trips open at the specified dimension.
5. In the main display (Figure 6-9 on page 6-12
), the beam
OUT icon should be tripped.
If the icon indicates that the limit switch is NOT
TRIPPED, troubleshoot the electric control system and
fix the problem.
The actuator OUT limit switch must TRIP open when
it contacts the actuator OUT tripping plate.
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