R&M Materials Handling HOIST MONITORS - Manual (Page 42)

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.
8 Multi-hoisting
8.1 General
Up to five units can be connected together with a CAN bus. The communication is tailored for the hoist
applications and is restricted for the hoist monitoring units only. It is not possible to add any other CAN
units to this bus.
Several functions are realised via CAN bus. Each unit indicates the status information and the load of the
hoist for all other units connected with the CAN bus. With this data two type of supervisions are done: run
supervision and sum overload protection. The run supervision makes sure that if several hoists are
running and one makes an uncontrolled stop, all other hoists are stopped as well. The sum overload
protection is mainly used for the bridge overload protection in such cases where the total sum load of the
individual hoists is bigger than the nominal load of the bridge.
There is no CAN bus master to collect all the information and make the needed supervisions. Instead, all
units see the status and load information of every other units and each unit carries out the similar
supervisions. Thus there are as many supervision units as stations connected to the CAN bus.
In addition to the status and load information, parameter values are transferred in the CAN bus. Every
unit is able to ask parameter values from any other unit. This makes it possible to read with the display
unit the parameter values of any other connected unit.
1
2
1. Maximum 5 units
2. CAN bus
8.2 Multi-hoisting instructions
8.2.1 Multi-hoisting parameters
The CAN bus related parameters are presented in the table below. Note that the changes of the
parameters in the group 4-11 Comm hoist take effect only after power off – power on reset. After
switching the power on, the bus configuration is set and it must be fixed all the time. This means that it is
not allowed to add any new stations or leave away any of the present stations.
Parameter Value Description Note
6
Design Design values menu Accessible with password level 6
6-1
Hoist name A…E The identifying character for the hoist-
monitoring unit The address used in the CAN bus communication, each unit must
have a unique address, a good practice is to name the units in
the alphabetic order