Lenze 8400 TopLine - Manual (Page 460)

8 Technology applications
8.3 TA "actuating drive speed (AC Drive Profile)"
460
Lenze · 8400 TopLine · Reference manual · DMS 6.0 EN · 06/2014 · TD05/TD14
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Definition of the speed setpoint
The speed setpoint is usually defined as process date via the fieldbus. If set accordingly, the speed
setpoint can also be determined locally (e.g. via the analog input 1). Depending on the selection,
either only the nMainSetValue_a application input or only the application input nAuxSetValue_a is
effective. The following table shows the relationships:
Scaling of the speed setpoint
If the setpoint is determined via fieldbus (NetRef=1), the setpoint applied to the nMainSetValue_a
application input is evaluated with the speed scaling set in C01353/1 (AC Drive Attribute
22).  Scaling of speed and torque values .
If the setpoint is determined locally (e.g. via the analog input 1), the setpoint applied to the
nAuxSetValue_a application input is scaled as follows:
16384 ≡ 100 % reference speed ( C00011 ).
Offset & gain
Offset and gain of the speed signal can be set in
C00696 and C00670 for a simple signal adjustment
of a setpoint encoder.
Ramp function generator
The setpoint is transformed to a speed setpoint in the setpoint encoder via a ramp function
generator with linear or S-shaped ramps.
• Upstream to the ramp function generator, a blocking speed masking function and a setpoint
MinMax limitation are effective.
• For a detailed functional description see the L_NSet FB.
Selection of the direction of rotation
• In case of control via fieldbus via bit 0 "Run Forward" and bit 1 "Run Backward" of the AC Drive
Profile control word.
• In case of local control via the bSetSpeedCcw application input or by selecting negative fixed
setpoints.
Fieldbus used Control mode
( C00007 )
Speed
reference
AC Drive Profile control word
(wMCIDriveControl)
effective input
(at LA_NCtrl)
40: MCI via fieldbus
(data word 2)
Bit 6 ("NetRef") = 1 nMainSetValue_a
local* Bit 6 ("NetRef") = 0 nAuxSetValue_a
30: CAN via fieldbus
(data word 2)
Bit 6 ("NetRef") = 1 nMainSetValue_a
local* Bit 6 ("NetRef") = 0 nAuxSetValue_a
- 10: Terminals 0
12: Terminals 2
14: Terminals 11
16: Terminals 16
local* 9 ≡ 0x0009
• Bit 0, SwitchOn = TRUE
• Bit 3, EnableOperation = TRUE
• All others: FALSE
nAuxSetValue_a
20: Keypad C00728/3
21: PC C00472/1
* The local setpoint is selected in the Lenze setting via the analog input 1