R&M Materials Handling HOIST MONITORS - Manual (Page 43)

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.
Parameter Value Description Note
4-11
Comm hoist The settings for common hoisting Accessible with password level 4
4-11-1
Hoist cnt 2…5 The amount of units connected into the CAN
bus Each unit connected into the CAN bus must have the same
number.
4-11-2
Run sup Yes Activates the multi-hoist supervision If multi-hoist supervision is not required, set this parameter to
“No”
4-11-3
B OL Yes Activates the bridge overload supervision If bridge overload supervision is not required, set this parameter
to “No”
4-11-4
B nom load “n” t Rated load of the crane Overload detection has similar filtering as in the overload
detection of an individual unit. This parameter scales the load
information transferred in the CAN bus. Each unit connected into
the CAN bus must have the same value.
8.2.2 Cabling
CAN bus is connected by three wires between the terminals as follows:
36 CAN-H Differential high signal
37 CAN-L Differential low signal
38 CAN-GD Zero level for high and low signals
How to connect the
shielded cables
The connection is made one-to-one i.e. terminals 36 CAN-H of each
unit are directly connected, 37 CAN-L and 38 CAN-GD similarly.
It is highly recommended to use shielded cable for the CAN bus. The
cable shield is connected to the ground of the hoist. It is recommended
to use 360 degrees shield clamps to carry out the grounding.
Especially the shield should NOT be connected to the terminal 20 PE
or 38 CAN-GD.
If the CAN bus is very short and the hoist –monitoring devices are
located close to each other, also twisted cables can be used.
It is recommended to separate the bus cable from power cables. There
should be enough free space or other type of isolation between the
bus cable and power cables.
Theoretically the bus line can be over 1000 meters (~3000 ft) with the
speed of 50 kbit/s. In practice, however, external disturbances,
reflection waves, bus topology, termination exceptions etc. limits the
maximum bus length.