L8 Hardware Protection - YASKAWA E7N Technical Manual

L8 Hardware Protection

L8-01 Internal Dynamic Braking Resistor Protection Selection
Setting
0 Not Provided (factory default)
1 Provided
This parameter is not applicable for Drive operation.
L8-02 Overheat Pre-Alarm Level
o
Setting Range: 50 to 130
o
Factory Default: 95 C
L8-03 Overheat Pre-Alarm Operation Selection
Setting
0 Ramp to Stop (Decel Time C1-02)
1 Coast to Stop
2 Fast-Stop (Decel Time C1-09)
3 Alarm Only
4 OH Alarm and Reduce (factory default)
The Drive is capable of warning the operator of an impending heatsink over-temperature fault via an OH pre-alarm. The level
at which the pre-alarm will activate is determined by the setting of parameter L8-02. Measurement of the heatsink temperature
is done with several strategically mounted thermistors. If any of the heatsink thermistors measure a temperature in excess of
the setting of L8-02, the Drive will fault (OH2) and either: ramp to stop using the C1-02 deceleration rate (L8-03= "0: Ramp to
Stop"), coast to stop (L8-03= "1: Coast to Stop"), ramp to stop using the C1-09 fast stop deceleration rate (L8-03= "2: Fast-
Stop"), alarm (OH) and continue running (L8-03 = "3: Alarm Only"), alarm (OH) and continue running but at a reduced speed
(L8-03= "4: Alarm & Reduce"). If L8-03= 4: Alarm and Reduce, the Drive will continue to run but will reduce the speed to the
level determined by parameter L8-19. Refer to the description for parameter L8-19.
If a digital output is configured for OH Prealarm (H2-01= "20: OH PreAlarm"), it will close whenever the heatsink tempera-
ture is greater than the L8-02 level no matter what the setting is of L8-03.
L8-10 Heatsink Cooling Fan Operation Selection
Setting
0 Fan On-Run Mode (factory default)
1 Fan Always On
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Description
C
Description
Description
Programming 5 - 69