Yaskawa Matrix Converter User Manual Page 220

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Machine Protection
6-55
Operation during Motor Overheat
Set the operation if the motor overheats in parameters L1-03 and L1-04. Set the motor temperature input filter
time constant in L1-05. If the motor overheats, the OH3 and OH4 error codes will be displayed on the digital
operator.
Error Codes If the Motor Overheats
By setting H3-09 (Terminal A2 Function Selection) or H3-05 (Terminal A3 Function Selection) to E (Motor
temperature input), alarm OH3 or OH4 will occur using the PTC temperature-resistance characteristics, and
protect the motor. The terminal connections are shown in the following diagram.
Fig 6.41 Mutual Connections During Motor Overheating Protection
Limiting Motor Rotation Direction
If the motor reverse rotation is prohibited, a Reverse Run Command will not be accepted even if it is input.
Use this setting for applications in which reverse motor rotation can cause problems (e.g., fans, pumps, etc.).
Related Parameters
Error Code Details
OH3 MxC stops or continues to operate, according to the setting in L1-03.
OH4 MxC stops according to the setting in L1-04.
Parameter
Number
Name
Description
Setting
Range
Default
Change
during
Run
Control Methods
Display
V/f
Open
Loop
Vector
Flux
Vector
b1-04
Reverse Operation
Selection
Determines the forward rotation of the motor,
and if reverse operation is disabled.
0: Reverse enabled.
1: Reverse disabled.
0 or 1 0 No A A A
Reverse Oper
MxC
Multi-function
contact input
Branch resistance
18 kΩ
PTC thermistor
Multi-function
contact output
Fault contact output
Multi-function
PHC output
+ V
(+15 V, 20 mA)
A3
(0-10 V)
AC
M1
M2
MA
MB
MC
P1
P2
PC
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