Yoshitake MD-71, Руководство по эксплуатации

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9.Maintenance procedure
9.1 Malfunctions and troubleshooting
If the shut-off valves and control panel do not operate as specified, see "each part name
of '4.2 Control panel' on page 5" to adopt measures according to the following table:
Failure
condition
Cause of the failure Troubleshooting and means
The power
supply lamp
①
is turned off.
1.The breaker
⑤
is turned "off."
2.The battery switch
⑨
is not turned on.
3.The fuse
⑫
has blown.
4.The input power supply voltage is
inconsistent with the control panel power
supply specification.
1.Turn "on" the breaker
⑤
.
2.Turn on the battery switch
⑨
.
3.Replace the fuse
⑫
.
4.Check the power supply
specifications printed left inside
the control panel to supply correct
voltage.
Even when the
shut-off valve
automatic/close
selector switch
⑮
is operated to
the "close" side,
the shut-off
valve does not
work.
Factors of the control panel
1.The input power supply, breaker
⑤
, and battery
switch
⑨
are not turned on.
2.The connection of the control panel and
shut-off valve is incorrect.
1. Turn on each switch to energize the
unit.
2.
Connect the wires as instructed on
the connection diagram.
Factors of the shut-off valve
1.Due to rain water intrusion or an equivalent, the
substrate and contact points are corroded.
2.The manual clutch knob is set on the manual side.
3.Foreign material is trapped, resulting in a
lock.
1.Replace the electric actuator.
2.Set it to the automatic side.
3.Remove the foreign material.
Even when the
shut-off valve
opening switch
③
is pressed,
the shut-off
valve does not
opens the valve.
Factors of the control panel
1.The input power supply, breaker
⑤
, and battery
switch
⑨
are not turned on.
2.The connection of the control panel and shut-off
valve is incorrect.
3.The pushing time of the shut-off valve opening
switch
③
is short.
4.The steel ball retention intent stopper (tie
wrap band) is not removed. See "7.4 How to
adjust the seismic detector."
1.Turn on each switch to energize the unit.
2.Connect the wires as instructed on the
connection diagram.
3.Press the shut-off valve opening switch
③
for at least 3 seconds.
4.Remove the steel ball retention intent
stopper (tie wrap band).Also, see "7.4
How to adjust the seismic detector." If
the unit does not start running even
when the stopper is removed, contact
our company.
Factors of the shut-off valve
1.Due to rain water intrusion or an equivalent, the
substrate and contact points are corroded.
2.The manual clutch knob is set on the manual side.
3.Foreign material is trapped, resulting in a
lock.
1.Replace the electric actuator.
2.Set it to the automatic side.
3.Remove the foreign material.
The operation of
the shut-off
valve is
unstable.
1.High frequency noise is injected from the outside,
such as an inverter pump.
2.Induction noise is injected.
1.Install each optional noise filter from the
inverter manufacturer. Shield the wiring
to earth.
2.Set apart the power wiring, such as a
3-phase motor. Shield the wiring to
earth.
The operation of
the shut-off
valve stops in a
middle position.
(Unstable
operation)
1.As valve torque increases, the protective circuit is
activated.
The connector unit or seat portion traps
foreign material.
1.Remove the foreign material.