268 Parameters
Defines the light intensity of the transmission LED of RDCO
module channel CH0. (This parameter is effective only when
parameter
is set to
. FDCO modules have a hardware transmitter current
selector.)
In general, use higher values with longer fiber optic cables.
The maximum setting is applicable to the maximum length of
the fiber optic link. See
Specifications of the fiber optic
(page
).
10
1…15
Light intensity.
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
Drive trips on
. This only
occurs if control is expected from the external controller, or if
supervision is forced using parameter
1
Last speed
Drive generates an
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
Drive generates an
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
No.
Name/Value
Description
Def
/
FbEq16
Summary of Contents for ACS860
Page 1: ... ABB INDUSTRIAL DRIVES ACS860 primary control program Firmware manual ...
Page 4: ......
Page 10: ...10 Table of contents ...
Page 18: ...18 Using the control panel ...
Page 24: ...24 Control locations and operating modes ...
Page 54: ...54 Program features ...
Page 78: ...78 Program features ...
Page 90: ...90 Application macros ...
Page 342: ...342 Additional parameter data ...
Page 380: ...380 Fault tracing ...
Page 381: ...Fault tracing 381 ...
Page 382: ...382 Fault tracing ...
Page 436: ...436 Control chain diagrams ...