Delta MS300 Series User Manual page 604

ID Display on LCD Keypad
61
Action Condition
Action Time
Fault Treatment Parameter
Reset Method
Reset Condition
Record
Cause
The electromagnetic valve
operates incorrectly during Y-Δ
switch.
Incorrect parameter setting
Y-
The wiring of Δ switch function is
incorrect
Fault Name
Y-connection / Δ-
connection
switch error
(ydc)
Action and Reset
1. ydc occurs when the confirmation signals of Y-connection and Δ-connection
are conducted at the same time.
2. If any of confirmation signals is not conducted within Pr.05-25, ydc occurs.
Pr.05-25
N/A
Manual reset
Can be reset only when the confirmation signal of Y-connection is conducted if
it is Y-connection, or when the confirmation signal of Δ-connection is conducted
if it is Δ-connection.
Yes
Check if the electromagnetic valve works normally.
If not, replace it.
Check if related parameters are all set up and set correctly.
Check the wiring.
595
Fault Descriptions
Y-
An error occurs when
Corrective Actions
Chapter 14 Fault CodesMS300
Δ switches