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9.2
9.2.1 Reference Frequency
The following signal sources are available for determining the reference frequency:
The reference line value with the parameter name
sent to the frequency inverter via the bus.
The internal reference value reaches the frequency inverter via the reference fre-
quency channel. The reference frequency channel is configured via parameter
ence Frequency Source
The actual value can be read back vie different parameters. The selection depends on
the control method used and the application. The following parameters are possible,
for example:
The internal reference value from the reference frequency channel and the reference
line value (line setpoint) can be fed to the ramp individually or as an added variable.
The
ence Ramp Frequency
The operation mode of the ramp function is set via the data set related parameter
Ramp Setpoint
For information on the reference frequency channel, refer to the frequency inverter
operating instructions.
05/08
05/08
Reference Value
−
External reference value as reference line value from bus
Internal reference value from the reference frequency channel
−
475.
Stator Frequency
−
210
Encoder 1 Frequency
−
(Speed Sensor 1 Frequency)
Encoder 1 Speed
−
218
(Speed Sensor 1 Speed)
ramp function
Reference line value
from Bus
Reference Frequency
RAM
484
0
Internal reference
value of
0
reference frequency
channel
Operation Mode
result
is
available
283.
434.
Ramp Setpoint
434
1 – Internal Setpoint
2 – Line Setpoint
3 – Internal + Line Setpoint
Modbus Instruction manual
Modbus Instruction manual
Reference Frequency RAM
(data type long, Hz)
217
(data type long, Hz)
(data type int, rpm).
fmin
+
fmax
+
Ramp Setpoint
434
at
the
output
of
the
The internal reference frequency is determined
from the reference frequency channel.
The reference value is supplied externally via the
bus
Addition (considering the sign) of internal refer-
ence frequency and reference line value
484 is
Refer-
Ramp
Reference Ramp
Frequency 283
Refer-
ramp
function
as
Function
63
63
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