Control Techniques unidrive sp Advanced User's Manual page 185

Parameter Keypad and
Menu 11
structure display
11.26 Minimum comms transmit delay
Drive modes Open-loop, Closed-loop vector, Servo, Regen
Bit SP
Coding
Open-loop, Closed-loop vector, Servo,
Range
Regen
Open-loop, Closed-loop vector, Servo,
Default
Regen
Update rate Background read
There will always be a finite delay between the end of a message from the host (master) and the time at which the host is ready to receive the
response from the drive (slave). The drive does not respond until at least 1ms after the message has been received from the host allowing 1ms for the
host to change from transmit to receive mode. This delay can be extended using Pr 11.26 if required for both ANSI and Modbus RTU protocols.
Pr 11.26
0 The transmit buffers are turned on and data transmission begins immediately.
1 The transmit buffers are turned on and data transmission begins after 1ms.
The transmit buffers are turned on after an additional delay of (Pr 11.26 – 1)ms and data
2 or more
transmission begins after a further 1ms delay.
Note that the drive holds its own transmit buffers active for up to 1ms after it has transmitted data before switching to the receive mode, and so the
host should not send any data during this time.
Modbus RTU uses a silent period detection system to detect the end of a message. This silent period is either the length of time for 3.5 characters at
the present baud rate or the length of time set in Pr 11.26, whichever is the longest.
11.28 Drive derivative
Drive modes Open-loop, Closed-loop vector, Servo, Regen
Bit SP
Coding
Open-loop, Closed-loop vector, Servo,
Range
Regen
Update rate Write at power-up
If this parameter is zero the drive is a standard Unidrive SP product. If this parameter is non-zero then the product is a derivative product. Derivatives
can have different defaults from the standard product and restrictions on the values allowed for some parameters.
11.29 Software version
Drive modes Open-loop, Closed-loop vector, Servo, Regen
Bit SP
Coding
Open-loop, Closed-loop vector, Servo,
Range
Regen
Update rate Write at power-up
The drive software version consists of three numbers xx.yy.zz. Pr 11.29 displays xx.yy and zz is displayed in Pr 11.34. Where xx specifies a change
that affects hardware compatibility, yy specifies a change that affects product documentation, and zz specifies a change that does not affect the
product documentation.
11.30 User security code
Drive modes Open-loop, Closed-loop vector, Servo, Regen
Bit SP
Coding
Open-loop, Closed-loop vector, Servo,
Range
Regen
Open-loop, Closed-loop vector, Servo,
Default
Regen
Update rate Background read
If any number other than 0 is programmed into this parameter user security is applied so that no parameters except Pr 11.44 can be adjusted with the
184
Parameter Parameter
x.00 description format
FI DE Txt VM DP ND
0 to 250 ms
2
Action
FI DE Txt VM DP ND
1
0 to 16
FI DE Txt VM DP ND
2 1
1.00 to 99.99
FI DE Txt VM DP ND
1
0 to 999
0
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Advanced parameter
Macros
descriptions
RA NC NV PT US RW BU
1 1
RA NC NV PT US RW BU
1 1
RA NC NV PT US RW BU
1 1
RA NC NV PT US RW BU
1 1 1
Serial comms Electronic
Performance
protocol nameplate
PS
1
PS
1
PS
1
PS
1 1
Unidrive SP Advanced User Guide
Issue Number: 7
Feature look-
up table