Trane TR1 6002, Installation And Operation Manual

Page: 87 / 118

87
Present Output Frequency
Slave ➝ Master
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Bit no.
The value of the output frequency of the drive at any given time is
transmitted as a 16-bit word. The value is transmitted in the form of
whole numbers 0 through ±32767 (±200%).
16384 (4000 Hex) corresponds to 100%.
The output frequency has the following format:
0 through 16384 (4000 Hex) @ 0 to 100% (Parameter 201,
Output Frequency Low limit - Parameter 202, Output Frequency
High Limit ).
Example - Status Word and Present Output Frequency:
The master receives a status message from the drive that the
present output frequency is 50% of the output frequency range.
Parameter 201, Output Frequency Low Limit = 0 Hz
Parameter 202, Output Frequency High Limit = 60 Hz
Status word = 0F03 Hex. Status message
Output frequency = 2000 Hex. 50% of the frequency range, cor-
responding to 30 Hz.
0F03 H 2000 H
Output
frequency
Status word
Output
frequency
Status
word
Serial Communication Reference
Master ➝ Slave
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Bit no.
The serial communication reference is transmitted to the drive in the
form of a 16-bit word. The value is transmitted as whole numbers
0 through ±32767 (±200 %).
16384 (4000 Hex) corresponds to 100 %.
The serial communication reference has the following format:
0 through 16384 (4000 Hex) - 0 through 100% (parameter 204,
Minimum Reference - Par. 205, Maximum Reference ).
It is possible to change the direction of rotation through the serial
reference. This is done by converting the binary reference value to 2's
complement. See example in next column.
Example - Control word and serial communication reference:
The drive must receive a start command, and the reference is to be set
to 50% (2000 Hex) of the reference range.
Control word = 047F Hex. Start command
Reference = 2000 Hex. 50 % reference
047F H 2000 H
The drive is to receive a start command, and the reference is to be set
to -50% (-2000 Hex) of the reference range.
The reference value is first converted to the first complement; then 1
binary is added to get 2’s complement:
2000 Hex= 0010 0000 0000 0000 binary
1´ complement = 1101 1111 1111 1111 binary
+ 1 binary
2´ complement = 1110 0000 0000 0000 binary
Control word = 047F Hex. Start command
Reference = E000 Hex. -50 % reference
047F H E0000 H
Serial com.
ref.
Control
word
Reference
Control word
Reference
Control word