Yaskawa Matrix Converter - Manual (Page 231)

6
-66
MxC Protection
This section explains the functions for protecting the MxC.
‹ Reducing MxC Overheating Pre-Alarm Warning Levels
The MxC detects the temperature of the heatsink using the thermistor, and protects the MxC from overheating.
The MxC overheating pre-alarms will occur in units of 1
° C.
The following overheating pre-alarm warnings are available: Stopping the MxC as error protection, and con-
tinuing operation with the alarm OH (Radiation fins overheating) on the digital operator flashing.
„ Related Parameters
* The default depends upon the MxC capacity. The value for a 200 V class MxC of 5.5 kW is given.
Parameter
Number
Name
Description
Setting
Range
Default
Change
during
Run
Control Methods
Display V/f
Open
Loop
Vector
Flux
Vector
L8-02
Overheat Alarm
Level
When the cooling fin temperature exceeds the
value set in this parameter, an Overheat
Alarm (OH) will occur.
50 to
130
90 °C* No A A A
OH Pre-Alarm Lvl
L8-03
Overheat Pre-
Alarm Operation
Selection Selects the MxC operation upon an OH pre-
alarm detection.
0: Decelerate to Stop
1: Coast to Stop
2: Fast-Stop
3: Alarm Only
0 to 3 3 No A A A
OH Pre-Alarm Sel