Monitoring functions
Configuring monitoring functions
Sin/cos signal monitoring (Sd8)
9
248
EDBCSXM064 EN 11.0
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
üSetting 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
248
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)
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