Mitsubishi FB13PNT, Quick Start Manual, Page: 105 / 292

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