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the motor
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Affinity User Guide
111
Issue Number: 5 www.controltechniques.com
6.2.15 User security
If any number other than 0 is programmed into this parameter, user
security is applied so that no parameters except parameter
0.49
can be
adjusted with the keypad. When this parameter is read via a keypad it
appears as zero.
For further details refer to Chapter 5.10.3
6.2.16 PC communications
This parameter defines the communications protocol used by the
EIA485 comms port on the drive. This parameter can be changed via the
drive keypad, via a Solutions Module or via the comms interface itself. If
it is changed via the comms interface, the response to the command
uses the original protocol. The master should wait at least 20ms before
send a new message using the new protocol. (Note: ANSI uses 7 data
bits, 1 stop bit and even parity; Modbus RTU uses 8 data bits, 2 stops
bits and no parity.)
ANSIx3.28 protocol
Full details of the CT ANSI communications protocol are the
Advanced
User Guide
.
Modbus RTU protocol
Full details of the CT implementation of Modbus RTU are given in the
Advanced User Guide
.
Modbus RTU protocol, but with a keypad only
This setting is used for disabling communications access when the
keypad is used as a hardware key.
* only applicable to Modbus RTU mode
This parameter can be changed via the drive keypad, via a Solutions
Module or via the comms interface itself. If it is changed via the comms
interface, the response to the command uses the original baud rate. The
master should wait at least 20ms before send a new message using the
new baud rate.
Used to define the unique address for the drive for the serial interface.
The drive is always a slave.
Modbus RTU
When the Modbus RTU protocol is used addresses between 0 and 247
are permitted. Address 0 is used to globally address all slaves, and so
this address should not be set in this parameter
ANSI
When the ANSI protocol is used the first digit is the group and the
second digit is the address within a group. The maximum permitted
group number is 9 and the maximum permitted address within a group is
9. Therefore, Pr
0.37
is limited to 99 in this mode. The value 00 is used
to globally address all slaves on the system, and x0 is used to address
all slaves of group x, therefore these addresses should not be set in this
parameter.
6.2.17 Hold zero speed / pre-heat
Pre-heat mode is enabled if Pr
0.38
is set to a one and Pr
0.39
is set to a
value greater than zero. When the run command is removed and the
motor has reached standstill then the drive applies a percentage
(determined by the value in Pr
0.39
) of the motor rated current. When
pre-heat is active, then the keypad displays the status "Heat".
Hold zero speed is enabled if Pr
0.38
is set to a one and Pr
0.39
is set to
zero. When the run command is removed and the motor has reached
standstill, the drive continues to apply the magnetizing current. The
level of magnetizing current cannot be modified. When hold zero speed
is active, then the keypad displays the status "StoP".
The drive cannot be switched between hold zero speed and pre-heat
mode if any one of these modes is active. The drive should be disabled
or running to change the mode.
6.2.18 Autotune
Open-Loop
There are two autotune tests available in open loop mode, a stationary
and a rotating test. A rotating autotune should be used whenever
possible, so the measured value of power factor of the motor is used by
the drive.
•
The stationary autotune can be used when the motor is loaded and it
is not possible to remove the load from the motor shaft.
•
A rotating autotune first performs a stationary autotune, before
rotating the motor at
2
/
3
base speed in the forward direction for
several seconds. The motor must be free from load for the rotating
autotune.
To perform an autotune, set Pr
0.40
to 1 for a stationary test or 2 for a
rotating test, and provide the drive with an enable signal (on terminal 31)
and press the green (hand) button.
0.34 {11.30}
User security code
RW
Uni
NC
PT
PS
Ú
0 to 999
Ö
0
0.35 {11.24}
PCcomms mode
RW
Txt
US
Ú
AnSI (0), rtu (1), Lcd (2)
Ö
rtU (1)
Comms value
String
Communications mode
0
AnSI
ANSI
1
rtU
Modbus RTU protocol
2
Lcd
Modbus RTU protocol, but with a
keypad only
0.36 {11.25}
PC comms baud rate
RW
Txt
US
Ú
300 (0), 600 (1), 1200 (2),
2400 (3), 4800 (4), 9600 (5),
19200 (6), 38400 (7),
57600 (8)*, 115200 (9)*
Ö
19200 (6)
0.37 {11.23}
PC comms address
RW
Uni
US
Ú
0 to 247
Ö
1
0.38 {6.08}
Hold zero speed / Motor pre-heat enable
RW
Bit
US
Ú
OFF (0) or On (1)
Ö
OFF (0)
0.39 {6.52}
Motor pre-heat current magnitude
RW
Uni
US
Ú
0 to 100 %
Ö
0
The value in Pr
0.39
should not be set too high because it
could damage the motor or cause the motor thermal
protection to operate and trip the drive.
0.40 {5.12}
Autotune
RW
Uni
OL
Ú
0 to 2
Ö
0
RFC
Ú
0 to 4
Ö
0
CAUTION
Summary of Contents for Affinity
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