Yaskawa YASNAC PC NC Maintenance Manual - Manual (Page 79)

PC NC Maintenance Manual Chapter 4: Troubleshooting
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AL-45:Heat sink thermistor disconnection
Error Contents The thermistor for the heat sink temperature detection was discon-
nected.
Detection Methods The heat sink temperature detection voltage is consistent from ther-
mistor signal (7CN-39) for the heat sink temperature detection.
If heat sink temperature is less than heat sink level disconnection detec-
tion level
(-10ºC), the current is intercepted due to heat sink thermistor discon-
nection (AL-45).
Cause and measures
AL-46, -47: Control card temperature errors 1, 2
Error Contents AL-46: The control card temperature exceeded +80 ºC.
AL-47: The control card temperature exceeded +85 ºC.
Detection Methods The control card temperature detection voltage is consistent from the
control card temperature detection sensor signal.
If the control card temperature exceeds 80ºC, minor fault display is per-
formed due to control card error 1(AL-46). The drive continues.
If the control card temperature exceeds 85ºC, the current is intercepted
due to control card error 2(AL-47).
Cause and measures
Cause Measures
Inverter ambient temperature is low. Check the inverter ambient temperature of the inverter.
Raise the ambient temperature -10ºC or more.
Observe the heat sink temperature by the drive state display
(U1-13).
Thermistor signal conductor for heat
sink temperature detection Check the inverter temperature by the drive state display (U1-
13). Correct thermistor signal conductor wiring for the heat sink
temperature detection.
Control card fault Exchange unit (exchange control card)
Cause Measures
Inverter ambient temperature is
high. Check the inverter ambient temperature.
Observe the temperature of the drive state display (U1-12) con-
trol card.
Control card fault Exchange unit (exchange control card)