Monitoring functions
Configuring monitoring functions
Sin/cos signal monitoring (Sd8)
221
EDBCSXS064 EN 4.0
9.3.17
Sin/cos signal monitoring (Sd8)
Fault message
Monitoring function
System variable
Possible response
TRIP
Messag
e
Warnin
g
Off
088
Sd8
Sin/cos signal fault
MCTRL_bEncoderFault_b
ü
·
·
Default setting
ü
Setting possible
This monitoring function carries out a plausibility test to check that the encoder is available
and that the sin/cos track supply plausible values with regard to each other.
ƒ
If required, the encoder has to move by several angular degrees for actuating a fault.
ƒ
The response is set via C0580.
ƒ
The filter time constant (C0559) serves to filter short−time trouble on the sin/cos
track of the encoder without an SD8 trip being released immediately.
ƒ
The "Sd8" fault message can only be reset by mains switching.
Code
Possible settings
IMPORTANT
No.
Designation
Lenze/
{Appl.}
Selection
C0580 Monit SD8
3
Fault response − monitoring of
SinCos signals at X8
221
0
TRIP
3
Off
C0559 SD8 filter t
1
Filter time constant (SD8)
1
{1 ms}
200 Example:
If the setting is "10 ms", a
SD8−TRIP is actuated after 10 ms.
Note!
For the desired encoder monitoring, and in particular when using synchronous
machines, set fault handling to "TRIP".
In order to achieve further encoder safety, monitoring of following errors can
be activated for positioning systems. Set its fault response to "TRIP", too.
Visible faults
Non−visible faults
l
Unplugged plug, all encoder signals open.
l
Singe wire breakage, one of the following signals is
missing:
– COS A
– RefCOS A
– SIN B
– RefSIN B
– GND
– VCC
l
Double wire breakage with the following signal
pairs:
– COS A and RefCOS A
– SIN B and RefSIN B
– COS A and SIN B
– RefCOS A and RefSIN B
– and all four signals (COS A, RefCOS A, SIN B,
RefSIN B) open.
l
Short circuits, in particular between sine and cosine
signals.
l
Cable/encoder faults with intermediate values
l
"Semi"−short circuits (> 0 Ohm)
l
"Semi"−interruptions (< infinite)
