R&M Materials Handling VARIABLE SPEED CONTROLS ControlMaster Plus Service Manual - Manual (Page 47)

R&M Materials Handling, Inc.
4501 Gateway Boulevard
Springfield, Ohio 45502
P.: (937) 328-5100
FAX: (937) 325-5319
47/83 R&M Materials Handling, Inc. reserves the right to alter or amend the above information without notice.
6 SYNCHRO FUNCTION
The Synchro function is designed for hoisting applications, where up to four separate hoisting machineries can be driven
in speed synchronization without external computing device. This is a SystemBus -based common hoist application.
The Synchro application has following major requirements
−
Two channel speed feedback from the motor to
the drive.
−
Synchronization activation via digital input DID1.
−
SystemBus option boards and fibre optic cable(s)
between the drives.
−
Software version Ind2V101 or newer.
2.8 Function
In the Synchro function it is possible to connect up to four drives to common use. Drives can be active or passive.
“Active” means that the drive will participate on the Synchronization and “passive” means that the drive will only echo the
data forward. For example three drives can be active and one passive (Back up drive). Master drive can also be passive.
In this case it will only handle the calculation of the correction for the other drives.
- Digital input DID1 activates a drive to synchronization.
- Synchronization is active if at least two drives are active.
- Synchronization is deactivated if only one drive is active.
When any drive connected to the system bus is active, the current hook positions of drives are registered. Hereafter the
master controls all active drives so that, the relative position between the hooks stays at this level.
Master gets the speed references and position information from the slave drives via SystemBus. Smallest speed
reference will be selected as Synchro speed reference, and smallest position as Synchro position. Master will then
calculate the position differences for each drive, and limit them if needed. Then the master will calculate speed correction
for each drive, which is sent accordingly to each drive via SystemBus. Only deceleration is allowed with correction.
m
If SystemBus option card is not installed, DID1 functions as FWE activation input.
m
From the drives connected to the SystemBus, the user must select one drive to function as a master. Setting the
parameter P2.4.1 Address to value 1 does this.
m
If one of the active drives has tripped to fault, all drives will be stopped according the fault and only the tripped
drive will show fault code. Faults of passive drive won’t affect the active drives.
m
If slow-down limit of any active drive opens, the limited speed will be used as a reference.
m
Brake operation and maintenance should have extra attention with the Synchro
application. Major differences in brake operation (braking times) between drives can
cause large displacement errors, especially braking from full speed (in fault case),
and could lead to hazardous situations.
m
Multicare and Synchro functions must not be used together.