Alarm
code
Alarm
sub-
code
Name Description Check point and remedy reference
(Er2)
Digital Operator
communica-
tions error
(1) Communications ca-
ble disconnection or
bad connection
Check for cable continuity, contacts, or bad
connections.
→ Check that connectors are correctly in-
serted.
→ Replace the communications cable.
(2) Large numbers of
control wires mean that
the surface cover is not
mounted securely, and
the Digital Operator is
floating
Check the mounting of the surface cover.
→ Reduce the wire size. (Recommended
wire size (0.3 to 0.75 mm
2
))
→ Change the routing of wiring within the
unit so that the surface cover can be
mounted securely.
(3) Strong noise re-
ceived from surrounds
Check methods for measures against noise
(grounding conditions, communications ca-
ble/main circuit wiring and installation).
→ Implement measures against noise.
(For details, refer to
2-3-4 Wiring for
Main Circuit T
erminals on page 2-15.)
(4) Digital Operator
damage
Use a different Digital Operator to check if
er2 occurs.
→ Replace the Digital Operator.
(Er3)
CPU error
(1) Strong noise re-
ceived from surrounds
Check measures against noise (grounding
conditions, signal wiring and communication
cable/main circuit wiring and installation
methods, etc.).
→ Improve measures against noise.
9 Troubleshooting
9-6
M1 Series Standard Type User's Manual (I669)
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