Nova Electronics MCX514, User Manual

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NOVA electronics Inc. MCX514 -
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2.5.6 Errors Occurring at Automatic Home Search
The following table lists the errors that may occur during the execution of an automatic home search.
Table 2.5-10 Errors Occurring at Automatic Home Search
Cause of the error Operation of IC at the error Display at termination
The nALARM signal was activated in any of
the Steps 1 to 4
The search driving stops instantly without
executing the following steps.
RR0/D7 ～ 4(execution axis) ：１，
RR2/D4 ：１
The EMGN signal was activated in any of the
Steps 1 to 4
The search driving stops instantly without
executing the following steps.
RR0/ D7 ～ 4(execution axis) ：１，
RR2/D5 ：１
The limit signal in the moving direction
(nLMTP/M) is activated in Step 3 (Note)
The search driving stops instantly / by
deceleration without executing the following
steps.
RR0/D7 ～ 4(execution axis) ：１，
RR2/D3 or D2 ：１
The limit signal in the moving direction
(nLMTP/M) is activated in Step 4 (Note)
The offset action stops instantly / by
deceleration and the operation stops.
RR0/D7 ～ 4(execution axis) ：１，
RR2/D3 or D2 ：１
The nSTOP2 signal is already active at the
start of Step 3
Operation stops without executing the
following steps.
RR0/D7 ～ 4(execution axis) ：１，
RR2/D6 ：１
Make sure to check the D7
～
4 bits (n-ERR) of RR0 register after the termination of an automatic home search. If the error bit of
execution axis is 1, the automatic home search is not performed correctly.
[Note]
•
In Steps 1 and 2, when the limit signal in the moving direction becomes active, search driving stops instantly / by
deceleration, however the error does not occur.
■
Symptom at sensor failure
It describes the symptoms when a failure occurs regularly in the sensor circuit such as a home search signal or a limit signal.
However, analysis of intermittent failures caused by noise around the cable path, loose cable, or unstable operation of the device is
difficult and such failures are not applicable to these cases described below. These symptoms may occur due to a logical setting
error or signal wiring error at the development of a customer system.
Table 2.5-11 Symptom at Sensor Failure
Failure cause Symptom
Failure in the device of the
limit sensor and wiring path
Kept ON The axis does not advance to the direction and the limit error bit (RR2/D3 or
D2) is set to 1 at the termination.
Kept OFF The axis runs into the mechanical terminal point and the home search
operation does not terminate.
Failure in the device of the
Step1 detection signal
(nSTOP0,1) sensor and wiring
path
Kept ON Although Step 1 is enabled and automatic home search is started from the
signal OFF position, the axis advances to Step 2 without executing Step 1
(high-speed home search).
Kept OFF Operation stops in Step 1 (high-speed home search) by setting the limit and
proceeds with irregular operation of Step 2. The home search result is
correct, however, the operation is not normal.
Failure in the device of the
Step2 detection signal (with
nSTOP1) sensor and wiring
path
Kept ON The axis moves in the opposite direction in Step 2 (low-speed home search)
and stops by setting the limit. At the termination, the error bit (RR2/D3 or
D2) of the limit in the opposite direction is set to 1.
Kept OFF
The axis moves in the opposite direction after setting the limit in the
specified direction in Step 2 (low-speed home search) and terminates by
setting the limit in the opposite direction.
At the termination, the error limit (RR2/D3 or D2) of the limit in the opposite
direction is set to 1.
Failure in the device of the
Z-phase (nSTOP2) sensor
and wiring path
Kept ON Operation stops due to an error in Step 3 (low-speed Z-phase search).
RR2/D6 is set to 1.
Kept OFF Operation stops in Step 3 (low-speed Z-phase search) by setting the limit in
the specified direction. The error bit of the limit in the specified direction
(RR2/D3 or D2) is set to 1 at the termination.