65
PIM00504
Warning
Code
Name Cause Corrective Action
L49
Motor electronic
thermal relay overload
Overload protection
triggered by the electronic
thermal relay has been
actuated.
The load torque is larger
than usual due to wear of
the pump, for example.
Replace the pump or motor
pump.
The motor magnets have
demagnetized and the
current has increased.
Replace the motor or motor
pump.
L50
Power supply voltage
drop
The main circuit voltage
value remained at under
254 V for 2 seconds.
The input power supply
voltage is low.
Improve the power supply
environment.
L53
Controller cooling fan
rotation speed drop
warning
The cooling fan speed
has decreased to 80% or
less of the normal speed
for 10 seconds or longer.
The cooling fan has
stopped.
• Replace the fuse for the fan.
• Replace the cooling fan.
• Replace the controller.
Foreign matter or dirt has
become entrapped in the
cooling fan.
Clean or replace the cooling fan.
L63
Pressure switch
actuation
The pressure switch has
been actuated.
The pressure reached the
value set for parameter
“P01: Pressure switch” or
lower.
If there is nothing abnormal in the
operation of the main machine,
review the set value for the
pressure switch or the delay time.
L67
Holding pressure
rotation speed drop
When target rotational
speed = 300 min
-1
, and
the status where pressure
value ≥ (set value + [H51:
DHSL] L67: Holding
pressure speed drop
warning judgment
pressure offset) has
continued for 2 seconds.
The throttle is clogged.
• Clean the throttle of the high-
pressure safety valve.
• Adjust the throttle.
• Replace the oil.
L70
Reverse rotation
When the start command
goes from OFF to ON and
the pressure does not
reach “H54: RT_O
Reverse rotation warning
judgment pressure” or
higher even after “P48:
T_SP Reverse rotation
warning judgment wait
time” or longer has
elapsed.
A run command has been
input immediately after a
stop while the load was
excessive.
• Increase the value of
parameter P48.
• Review the run timing and
delay the timing for issuing the
start command.
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