Delt VFD Series - VFD Series AC Motor Drives

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VFD series AC Motor Drives
Q What does the line start lockout function do?
A If Line Start Lockout is disabled, the AC motor drive will run when mains power is
switched on if a RUN command was present at power off.
If Line Start Lockout is enabled, the AC motor drive does not run when mains power
is switched on. It needs a new RUN command after power on.
If between power off and power on the source of operation command is changed, the
AC motor drive can be set to follow this new status or ignore this and keep the old
status.
Q How to dimension brake resistors for VFD?
A Please look for the application note “Dimensioning brake resistors 2008-01.pdf” and
AMD Braking.ppsx on ftp-site (Industrial Automation Products\AMD-Options\AMD
Brake units & resistors\Application notes for braking).
Q Can two drives in parallel control one motor?
A No, with Delta VFD this is not possible.
For this application, drives need to be able to cooperate in master-slave configuration
where one drive acts as master with frequency command input and controls the slave
gate drive.
Q Reset to defaults via Modbus RS-485 communication doesn’t work. Why?
A When a reset to defaults (e.g in VFD-E Pr00-02=9 (Modbus RTU command 01 06
0002 0009) is performed, all parameters, including the communication parameters,
are reset to default.
If the settings you use are different from default (Station address, protocol and/or
Baudrate), they will be reset to the default values and the communication will fail. Also
the source of frequency command and operation command (e.g. Pr02-00 and 02-01
in VFD-E) will be reset to their default values, making it afterwards impossible to
control the drive via Modbus RS-485.
This is an extra attention point that has to be taken into account when setting up serial
communication.