NORD Drivesystems BU0020 - Manual (Page 94)

PROFIBUS DP – Supplementary manual options for NORD - Frequency Inverters
94 BU 0020 GB-2612
9.3 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. PPO type 1 or PPO type 2 must be selected as the
PPO type.
The acceleration time parameter (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:
• Specify order label (Change parameter value (array word)= 7)
• Select parameter (P 102
dec
+ 1000 = P 1102 = P 44E
hex
)
• Select parameter set 3 (IND = 02)
• Set parameter word (1000
dec
/ 3E8
hex
)
• Check response telegram (positive for array word = 4)
The telegram is composed as follows in hexadecimal notation:
Word 1 2 3 4
Byte 0 1 2 3 4 5 6 7
Designation PKE IND PWE PWE
Value 74 4E 02 00 00 00 03 E8
When the order has been fully implemented by the inverter, it responds with (hexadecimal):
Word 1 2 3 4
Byte 3 4 5 6 7 8 9 10
Designation PKE IND PWE PWE
Value 44 4E 02 00 00 00 03 E8
WARNING
The maximum number or write cycles on the EEPROM of the frequency inverters is limited
to 100,000 cycles. Continuous writing to the EEPROM therefore results in the destruction
of the EEPROM.
Writing to the RAM of the frequency inverter should therefore be used for writing
parameter data. The setting for this is made in parameter P560 of the frequency inverter.
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