Kikusui PLZ-4W Series, User Manual

Page: 181 / 218

PLZ-4W Maintenance and Calibration 8-15
Symptom 4: Input current is unstable or oscillates.
Symptom 5: ALARM is activated.
Symptom 6: The load cannot be turned on.
Check Item
Possible Cause Remedy
Location and Status of the Object Check Result
Is rated voltage applied for the
input power supply (AC)?
No Low supply voltage
Use the PLZ-4W in the input
supply voltage range.
Yes Malfunction
Immediately stop the use of the
instrument and request repairs.
Is the ALARM illuminated? Yes
An internal or external
error occurred on the
PLZ-4W.
Check the alarm type and carry
out the appropriate remedy.
See section 5.3, “Types of Pro-
tection Functions.”
Is there a large loop in the load
wire?
Yes
→
Twist the wires.
See section 2.8, “Load Wiring.”
The load wire is long. Long
→
Change the response (transient
response) using menu setup.
Check Item
Possible Cause Remedy
Location and Status of the Object Check Result
Is the fan stopped?
Yes
Overheat protection
tripped. Immediately stop the use of the
instrument and request repairs.
Is the air intake or outlet
obstructed?
Yes
Overheat protection
tripped.
Clogged dust
fi lter
Allow at least 20 cm between the
air outlet and the wall. In addition,
do not place objects within 20 cm.
Clean the dust fi lter.
Is OCP tripped? Yes The OCP setting is small.
Set an appropriate OCP value on
the setup screen.
See section 5.4, “Setting the Pro-
tection Function.”
Is OPP tripped? Yes The OPP setting is small.
Set an appropriate OPP value on
the setup screen.
See section 5.4, “Setting the Pro-
tection Function.”
Check Item
Possible Cause Remedy
Location and Status of the Object Check Result
A sequence is in operation
Yes
→
Wait for the sequence operation
to
fi nish.
Abort the sequence using the
STOP key.
No
The load on/off logic
(Load ON IN) is set to
low. Set Load ON IN to high using
menu setup.
See section 5.13, “Menu Setup.”