Yaskawa YASNAC PC NC Maintenance Manual - Manual (Page 61)

PC NC Maintenance Manual Chapter 4: Troubleshooting
4-40
Cause and measures
45:Heat sink thermistor disconnection
Error Contents The thermistor for the heat sink temperature detection was discon-
nected.
Detection Methods
Cause and measures The voltage for the heat sink temperature detection is consistent with
the thermistor signal (2CN-10) for the heat sink temperature detection.
If the heat sink temperature is -20ºC or less, the gate is blocked (regen-
eration operation stop), and the alarm is processed.
46, 47:Control card temperature error 1, 2
Error Contents 46: Control card temperature exceeded +80ºC. (minor fault)
47: Control card temperature exceeded +85ºC.
The voltage for the control card temperature detection is consistent
with the thermistor signal for the temperature detection on the control
card.
If the temperature of the control card exceeds 80ºC, the minor fault dis-
play is performed due to control card temperature error 1 (46). The
drive continues.
The minor fault display is released if the temperature of the control
card is 79ºC or less.
Cause Measures
Ambient temperature is high. Check the ambient temperature.
Improve the cooling.
Control card fault Exchange unit (exchange control card)
Cause Measures
Ambient temperature is low. Check the ambient temperature.
Raise the ambient temperature to -20ºC or more.
Thermistor signal conductor disconnec-
tion for cooling fin temperature detection Check the thermistor wiring.
Control card fault Unit exchange (control card exchange)