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TANDEM HOIST EZCOM (SPEED / COMMAND / STATUS SYNCING)
command status, and fault status to sync between each hoist.
The VFD’s will need to be configured to communicate between each other and the internal logic activated. A 2-wire shielded cable is
ll be
used to supply an input to the VFD to activate the syncing logic when in tandem mode, digital input 6 is typically used.
HOW IT WORKS –
values between each other. While in sync mode the VFD’s compare the directional commands based on conditional internal logic,
which ensures if a hoist reaches a limit, or loses a command signal the opposite hoist will follow the command. While in tandem mode
NOTE – If the VFD’s are configured for EZCOM tandem sync (UE-43 > 0) and the EZCOM communication is disconnected _______ (db-
08 = 9999) the hoists will ignore all directional commands even when in individual mode and the communication disconnection must
be addressed. The only exception is if a brake slip is detected the VFD will ignore the EZCOM communication disconnection and
operated in an individual mode configuration.
TROUBLESHOOTING EZCOM COMMUNICATION DISCONNECTION (db-08 = 9999) – Use the VFD monitor parameter db-08 to monitor
the EZCOM communication disconnection. If the value shown in db-08 = 9999 then the communication is disconnected or timed out
or not configured correctly. Check the wiring between the VFD’s SN & SP terminals. Also make sure the VFD’s power up at the exact
same time or use a digital input to active the EZCOM communication by configuring one of the available digital inputs to 098:ECOM if
power cannot be verified at the same time. Verify EZCOM parameters are configured correctly using the EZCOM parameter chart on
the next page.
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