Mitsubishi Electric Q66DA-G, User Manual

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8
TROUBLESHOOTING
8.2 Troubleshooting
8.2.5 When the analog value is not within the reference accuracy of the theoretical value
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8.2.5 When the analog value is not within the reference accuracy of
the theoretical value
8.2.6 When analog output value is not "HOLD"
8.2.7 When External power supply READY (X7) does not turn on
Check item Action to be taken
When using voltage output, is a small load resistance of the con-
nected external device and a long wiring distance observed?
If observed, because a voltage drop due to the wiring impedance and
load current is large and the voltage applied to the external device is
low, the factory default range setting may not satisfy the reference
accuracy.
In this case, use User range setting and adjust the offset and gain
values after wiring.
Check item Action to be taken
Is the HOLD/CLEAR setting correct?
Check the Switch 3 setting of the intelligent function module switch
setting on GX Developer.
Is the Q66DA-G used on a MELSECNET/H remote I/O station? Take action, referring to POINT in Section 3.2.1.
Check item Action to be taken
Is the external power supply 24VDC supplied?
(1) Is the external power supply correctly wired?
(2) Is the external power supply 24VDC supplied within the speci-
fied range?
(1) Wire the external power supply by referring to the "External wir-
ing".(Refer to Section 4.4.2)
(2) Supply 24VDC within the range of the performance specifica-
tions. (Refer to Section 3.1.1)
The case other than the above
The possible cause is a failure of the Q66DA-G. Please consult your
local Mitsubishi representative.