R&M Materials Handling HOIST MONITORS User Manual
Page 29
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.
5.7 Sudden load increase supervision
In case the hoist-monitoring unit measures a sudden load increase when driving upwards in high speed,
the unit will control the hoist to low speed. A sudden load increase is considered when the load exceeds
30% of the rated load of the hoist within 200ms. High speed hoisting is allowed again when the load
increase in the last 200ms is less than the preset value, determined by parameter 4-7-2.
The function is completely reset when the measured load is less than 10% of the rated load of the hoist.
The function has no effect when the load is bigger than 30% of the rated load of the hoist. Sudden load
increase may occur e.g. due to jerky movements or starts in high speed.
L. Load
T. Time
1. First speed
2. Second speed
3. Load increase stops
This function can only be activated in two-speed application and hoist has no effect when hoisting
in low speed. Sudden load increase supervision is only activate with loads below 30% of rated load
and is activated only once.
5.7.1 Sudden load increase supervision instructions
Sudden load increase supervision parameters
Param.
Value Description
Note
4-7
Load param
Load calculation menu
Accessible with password 4: 8124
4-7-2
Load rate%
10
Load increase rate for controlling the hoisting in two step control, speed
change to fast speed is allowed when actual load change within 200ms <
parameter 4-7-2.
Setting range: 0…10%, steps of 1%
0% means that the function is not applied
10% is the factory default
A small value makes the hoist to drive in slow speed for a longer period, to ensure that the load is
stabilised (not stuck to the unloading platform etc. and no more vibrations caused by the ropes and/or
other mechanics).
A larger value (maximum 10) allows faster acceleration to fast speed.