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230
Problems and Countermeasures
Section 8-3
8-3-2
DeviceNet Slave Problem Solving
Red Indicator (ON or
Flashing)
Use the following table to troubleshoot in a Slave that has a red indicator that
is ON or flashing.
38
The motor axis is
vibrating
unsteadily.
The gain adjustment is insuffi-
cient. (The gain is too low.)
---
Perform autotuning.
Manually adjust (increase)
the gain.
39
The gain cannot be adjusted
because the mechanical rigidity
is too weak.
This particularly tends to occur
in systems with vertical axes,
scalar robots, palletisers, and
so on, which place a torsion
load on the axes.
Increase the mechanical rgid-
ity.
Re-adjust the gain.
40
The mechanical structure is
producing stick slip (high vis-
cosity statical friction).
---
Perform autotuning.
Manually adjust the gain.
41
The wrong Servomotor is
selected (so it cannot be
adjusted).
Check the torque and inertia
ratings and select another Ser-
vomotor.
Change to a suitable Servo-
motor.
42
The Servomotor or Servo Driver
is defective.
---
Replace the Servomotor or
the Servo Driver.
43
There is slip-
page in position-
ing.
The slippage is not constant.
Malfunction due to noise.
Is shielded cable being used?
Use shielded cable.
44
The shield is not properly
grounded at the Servo Driver.
Check the ground wiring.
Correct the wiring.
45
The MC Unit’s output power
supply is not separated from
other power supplies.
Check whether the MC Unit’s
output power supply is sepa-
rated from other power sup-
plies.
Separate the MC output sup-
ply from other power sup-
plies.
46
Install a noise filter at the pri-
mary side of the MC Unit’s
output power supply.
47
Ground the MC Unit’s output
power supply
48
Twisted-pair cable is not being
used for the encoder in- or out-
puts.
Check whether twisted-pair
cable is being used for the
encoder wires. (The connected
voltage is 0 V or 5/24 VDC.)
Use twisted-pair cable for
pulse outputs.
The encoder and other control
wires are not separated from
other power lines.
Check whether the cable is sep-
arated from other power lines.
Separate the cable from
other power lines.
53
There is malfunctioning due to
noise from a welding machine,
inverter, etc.
Check whether there is a device
such as a welding machine or
inverter nearby.
Separate the Unit from the
noise source.
54
There is slippage in the
mechanical system.
Check for slippage by marking
the mechanical connections.
Tighten the connections.
No.
Problem
Probable causes
Items to check
Remedy
Error
Probable cause
The MS indicator is a constant red.
The Slave Unit is faulty. Replace the Unit.
The MS indicator is flashing red.
• Check that the Slave’s baud rate setting is correct. The setting must be
125 kbps, 250 kbps, or 500 kbps. Restart the Unit after changing the
baud rate.
• Replace the Unit if the MS indicator continues to flash red even though
the baud rate setting is correct.