Mitsubishi FREQROL-SF Troubleshooting Manual page 44

(23) Alarm N0.52(0D) Over Droop
[This alarm occurs when the position error
becomes too large in synchronous tapping mode
(for 8 rotations against the reference value.)]
Cause
Item
The parameter #03 (PLG)
which is set from the
1
amplifier is not cor-
rectly set.
The bits 8 and E of the
parameter ORS2 (#30 for
2
amplifier; #16(~~) for
NC) are not correctly
set.
The orientation encoder
is defective.
3
The reference time
constant is small.
4
Item Cause
The servo axis alarm
1
occurs.
The cable CAM11 which
is linked with the NC
2
through the bus is
defective.
The connectors (CNlA and o Visually check the following
circuit board SF-TL card
3
are not correctly con-
The termination resistor o Replace the termination
is defective.
4
Check
by referencing Reference
by referencing Reference
1.2.2 (2) and 1.2.3(3).
alarm No.21(NS2), check the
signal waveform from the en-
coder.
using a stop watch or observe
the speed signal terminals
SMO and OM using an oscillo-
scope and check that the
acceleration time is shorter
than the reference constant
time.
(See Appendixes 1-4 and l-5.)
Check
alarm occurs.
check that the equipment cor-
rectly works.
(See Appendix 3(2).)
connections.
screws are loosen.
resistor which is connected
to the connector CNlB and
check that the equipment cor-
rectly works.
(See Appendix 3(2).)
Remedy
value.
values.
new one.
acceleration time constant
parameter CSN (amplifier
parameter #33 or NC para-
meter #19(PR)).
Remedy
servo axis alarm.
the new one.
cable and termination resis-
tor in place.
resistor with a new one.