76 Chapter 5 Parameter Introductions
EV2000 Series Universal Variable Speed Drive User Manual
F9.21 Frequency decrease
rate at voltage compensation
Range:0.00~99.99Hz/s
【
10.00Hz/s
】
Trip-free operating function enables the drive to perform
low-voltage compensation when the voltage drops or
instantaneous under-voltage occurs. The drive can
continue to operate without tripping by reducing its
output frequency and feedback energy via motor.
If F9.20 is set to 0, this function is disabled.
If F9.20 is set to 1, this function is enabled and
low-voltage compensation is activated.
If F9.21 (frequency decrease rate at voltage
compensation) is set too big, the feedback energy of
motor will be too large and over-voltage protection might
be activated; If F9.21 is set too small, the feedback
energy of motor will be too small to achieve voltage
compensation effect. So, please set F9.21 according to
load inertia and the actual load.
Note:
This function is active only for the drive of 22kW or below.
F9.22 Restart after power failure
Range:0. 1
【
0
】
F9.23 Delay time for restart after
power failure
Range:0.0~10.0s
【
0.5s
】
F9.22 and F9.23 decide whether the drive starts
automatically and the delay time for restart when the
drive is switched off and then switched on in different
control modes.
If F9.22 is set to 0, the drive will not run automatically
after restarted.
If F9.22 is set to 1, when the drive is
powered on after
power failure, it will wait certain time defined by F9.23
and then start automatically depending on the current
control mode and the drive’s status before power failure.
See Table 5-15
.
Table 5-15 Restarting conditions
Setting
of
F9.22
Status
before
power
off
Control modes
Panel
Serial
port
3-wire modes
1 and 2
2-wire modes
1 and 2
Without control command
With
0
Stop
0
0
0
0
0
Run
0
0
0
0
0
1
Stop
0
0
0
0
1
Run
1
1
1
0
1
Note:
Table 5-15 shows the drive’s action under different
conditions. “0” means the drive enter ready status and “1”
means the drive start operation automatically.
When using the panel or serial port or 3-wire modes 1 and 2
to start or stop the drive, the command signal is in pulse
mode and there is no operating command when the drive is
switched on.
If there is a stopping command, the drive will stop first.
When the function of restart after power failure is enabled,
the drive will start on the fly after power on if it is not
switched off totally (that is, the motor still runs and drive’s
LED displays “P.OFF”). It will start in the starting mode
defined in F2.00 after power on if it is switched off totally
(LED turns off).
For 2-wire mode 2, there is control command after
power-on.
5.11 Reserved (Group FA)
FA.00~FA.11
Reserved
5.12 Communication Parameters (Group FF)
FF.00 Communication
configuration
Range:0000~1127H
【
0005
】
A B C D
Baud rate
:
0: 300bps
1: 600bps
2: 1200bps
3: 2400bps
4: 4800bps
5: 9600bps
6: 19200bps
7: 38400bps
Data format
0: 1-8-1 format, no parity
1: 1-8-1 format, even parity
2: 1-8-1format, odd parity
Virtual input terminal
0: Disabled
1: Enabled
Wiring mode:
0: Cable
（
RS232/485
）
1: MODEM
（
RS232
）
Fig. 5-69 Communication parameters
Where,
A: thousand’s place B: Hundred’s place
C: Ten’s place D: Unit’s place
FF.00 is used to set the parameters of serial
communication.
Virtual terminal is used by the host PC to send
commands. Each Bit of the data represents one terminal.
Bit0~12 represent the status of virtual terminal X1~X8,
