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374 Parameters
DDCS controller
comm loss time
Sets a timeout for communication with the external controller.
If a communication break lasts longer than the timeout, the
action specified by parameter
is taken.
As a rule of thumb, this parameter should be set to at least 3
times the transmit interval of the controller.
Notes:
• There is a 60-second boot-up delay immediately after
power-up. During the delay, the communication break
monitoring is disabled (but communication itself can be
active).
• With an AC 800M controller, the controller detects a
communication break immediately but re-establishing the
communication is done at 9-second idle intervals. Also note
that the sending interval of a data set is not the same as the
execution interval of the application task. On ModuleBus,
the sending interval is defined by controller parameter
Scan
Cycle Time
(by default, 100 ms).
100 ms
0…60000 ms
Timeout for communication with external controller.
DDCS controller
comm loss function
Selects how the drive reacts to a communication break
between the drive and the external controller.
No action
No action taken (monitoring disabled).
0
Fault
. This only
occurs if control is expected from the external controller, or if
supervision is forced using parameter
1
Last speed
warning and freezes the speed to the level the drive was
operating at. This only occurs if control is expected from the
external controller, or if supervision is forced using parameter
DDCS controller comm supervision force
.
The speed is determined on the basis of actual speed using
850 ms low-pass filtering.
WARNING!
Make sure that it is safe to continue
operation in case of a communication break.
2
Speed ref safe
warning and sets the speed to the speed defined by
parameter
when frequency reference is being used). This only occurs if
control is expected from the external controller, or if
supervision is forced using parameter
WARNING!
Make sure that it is safe to continue
operation in case of a communication break.
3
Fault always
. This occurs
even though no control is expected from the external
controller.
4
Warning
warning. This only occurs if control is expected from the
external controller, or if supervision is forced using parameter
DDCS controller comm supervision force
.
WARNING!
Make sure that it is safe to continue
operation in case of a communication break.
5
No.
Name/Value
Description
Def
/
FbEq16
Содержание ACS880-x04
Страница 1: ... ABB INDUSTRIAL DRIVES ACS880 primary control program Firmware manual ...
Страница 4: ......
Страница 18: ...18 Using the control panel ...
Страница 24: ...24 Control locations and operating modes ...
Страница 111: ...Application macros 111 Fieldbus control macro This application macro is not supported by the current firmware version ...
Страница 112: ...112 Application macros ...
Страница 496: ...496 Additional parameter data ...
Страница 544: ...544 Fault tracing ...
Страница 602: ...602 Control chain diagrams ...