NORD Drivesystems BU0070 - Manual (Page 34)

NORDAC InterBus Operating Manual
34 Subject to technical alterations BU 0070 GB
7.3 Writing a parameter
When transferring parameter orders, it must be taken into account that the slave does not immediately respond to
orders in the parameter channel of the master telegram, but a positive response can be delayed by one or more
communication cycles. The master must therefore repeat the required order until the corresponding slave response
is received.
The parameter acceleration time (PNU = 102
dec
/ 66
hex
) of a frequency inverter should be set to the value 10sec in
parameter set 3. Only the PKW channel is evaluated.
As the acceleration time has a frequency-internal resolution of 0.01sec, a parameter value of 10 / 0.01 = 1000
(3E8
hex
) must be transferred for 2 sec.
Procedure:
• Select parameter (P 102
dec
+ 1000 = P 1102 = P 44E
hex
)
• Select parameter set 3 (IND = 02)
• Set parameter value (1000
dec
/ 3E8
hex
)
• Check response telegram
The telegram is composed as follows in hexadecimal notation:
3 4 5 6 7 8 9 10
PKE PKE IND IND PWE PWE PWE PWE
24 4E 02 00 00 00 03 E8
When the order has been fully implemented by the inverter, it responds with
3 4 5 6 7 8 9 10
PKE PKE IND IND PWE PWE PWE PWE
14 4E 02 00 00 00 03 E8