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2-18
2-18
3. 3.6 6
Pump
Pu
mp In Inve
Error code: E7
Error code: E7
Controller/motor overheat indicator ON. Lifting speed
Controller/mo
Situation
Situation
steering operations. Service tool "Alarm status" and "E7" displayed.
steering operations. Service tool "Alarm status" and "E7" displayed.
Possible
Possible
Overheating of pump inverter, faulty pump inverter thermal sensor, open harness wiring, faulty pump inverter
Overheating of pump inverter, faulty pump inverter thermal sensor, open harness wiring, faulty pump inverter
cause
cause
PC board, abnormal power supply of
PC board, abnormal power supply of logic unit, faulty radiation of
Trigger of
Trigger of
Controller temperature is out of
Controller temperat
the error
the error
range of -25 °C to 110 °C (-13 °F to 230 °F). Recovers when temperatur
range of -25 °C to 110 °C (-13
code
code
Checks
Checks
(1) Let truck cool for 15 minutes
(1) Let truck cool for 15 minutes
Without service tool
Without service tool
(8) Disconnect battery plug
(8) Disconnect battery plug
Wait until invertertemperature becomes close to room
Wait until invertertemperature becomes close to room
temperature
temperature
(10) Perform inverter discharging work
(10) Perform inverter discharging work
vert rter er, O
, Ove
verh rhea
eati ting
ng (E (E7) 7)
tor overheat indicator ON. Lifting speed slower than normal. Normal
ure is out of range of -25 °C
range of -25 °C to 100 °C
°F to 230 °F). Recovers when temperature is in range of -20 to 70
Overheat
Overheat
indi
indi
cator
cator
ON
ON
With service tool
With service tool
CHAPTER 2 TROUBLESHOOTING FOR CONTROL CIRCUITS
CHAPTER 2 TROUBLESHOOTING FOR CONTROL CIRCUITS
slower than normal. Normal traction motor and power
logic unit, faulty radiation of pump inverter, faulty display unit.
pump inverter, faulty display unit.
to 100 °C (-13 °F to 21
(-13 °F to 212 °F). Capacitor temperature is out of
Overheat
Overheat
(2) Pump inverter becomes normal
(2) Pump inverter becomes normal
(3) Check if truck is operated to lift large cargo load
(3) Check if truck is operated to lift large cargo load
(4) Perform inverter discharging work
(4) Perform inverter discharging work
Check thermal paste applied on inverter mounting
Check thermal paste applied on inverter mounting
Surface
Surface
Thermal past
Thermal past
Normal
Normal
(5) Replace pump
(5) Replace pump
inverter
inverter
(7) Confirm temperature of controller and head
(7) Confirm temperature of controller and head
capacitor with
capac
itor with
Less
Less
than
than
-20
-20
o
o
r m
r
mo
o
r
r
e
e
t
t
h
h
a
a
n
n
7
7
traction motor and power
2 °F). Capacitor temperature is out of
e is in range of -20 to 70 °C (-4 to 158 °F).
°C (-4 to 158 °F).
indi
indi
cator
cator
OFF
OFF
If problem reoccurs
If problem reoccurs
Normal
Normal
e fi
e
film should
lm should
be th
be
thin and even
in and even
.
.
Abnormal
Abnormal
(6) Clean mounting
(6) Clean mounting
surface,
surface,
apply thermal paste,
apply thermal paste,
then
then
reinstall inverter
reinstall inverter
input monitor
input monitor
°C(-
°C(-
4
4
°F)
°F)
-20
-20
°C
°C
to
to
0
0
°
°
C
C
( 1
(
15
5
8
8
°
°
F
F
)
)
( -
(
-4
4
°
°
F
F t
to
o
(9) Normal
(9) Normal
501136
501136
70
70
°C
°C
1
1
5
5
8
8
°
°
F
F
)
)
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