9300 Servo PLC
System blocks
2.13 Internal motor control (MCTRL_MotorControl)
2-57
9300ServoPLC EN 1.4
Example (
MCTRL_nNAct_v
in a 10 msec task):
• When the 10 msec task starts, the value of the counter is stored in a local area of the task and
the counter is reset. The value in the local area gives an average value in increments per 1
msec.
• If a position value is to be derived from this value, then it must be multiplied by
SYSTEM_nTaskInterval
/ 4, to get the result in increments per 10 msec, as in the example.
Example: In a 1 msec task,
SYSTEM_nTaskInterval
has the value 4 (4 * 250 µs=1msec)
• For Lenze FBs, this procedure has already been implemented in the FBs.
2.13.12 System marker MCTRL_nNmaxC11
The system marker
MCTRL_nNmaxC11
shows the max. speed set under C0011. This value is the
reference value for all “_a” values (16384 ≡
MCTRL_nNmaxC11
)
• With the help of this system marker you can program your own scaling routines in the
parameter manager.
• Example: C0011 = 3000 rpm →
MCTRL_nNmaxC11
= 3000
2.13.13 Monitoring
Various monitoring functions protect the drive from impermissible operating conditions.
If a monitoring function is activated,
• the corresponding set reaction is triggered,
• boolean (logic) variables are set to TRUE. You can use these variables in the PLC application
program.
2.13.13.1Undervoltage(LU)
• This function monitors the DC-bus and protects the drive.
• The message is triggered by
MCTRL_bUndervoltage_b
=TRUE.
Supply voltage range Selection number
(C0173)
Switch-off threshold Switch-on threshold
< 400 V 0 285 V 430 V
400 V 1 285 V 430 V
400 0 460 V 2 328 V 473 V
480 V without brake chopper 3 342 V 487 V
Operation with brake chopper
(up to 480 V)
4 342 V 487 V
Function
The monitoring reacts if the DC-bus voltage (terminal +U
G
and -U
G
) goes below the threshold
(switch-off level)that was set by C0173.
The message is reset if the voltage goes above the switch-off threshold again.
Theswitch-off threshold determinesthe voltagelevel of theDC-bus voltageat whichthepulseinhibit
is activated.
The input variable
MCTRL_bUndervoltage_b
canbeprocessedinthePLCapplicationprogram.
The selection number is also effective for the overvoltage monitoring OU.
(
^
2-58)
Adapt the setting of the codes to the available mains voltage (also for operation
via+U
G
/-U
G
-terminals). When the controller is operated in a network of drives, all controllers must
have the same setting.
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