Inverter Protection
6-47
Inverter Protection
Inverter Overheat Protection
The Inverter is protected against overheating using a thermistor that detects the heatsink temperature.
When the overheat temperature level is reached the inverter output is switched off.
To prevent a suddenly and unexpected stop of the inverter due to an overtemperature, an overheating
pre-alarm can be output. The temperature level for that pre-alarm can be set in constant L8-02. Using con-
stant L8-03 the inverter operation when an overtemperature occurs can be selected.
Related Constants
Multifunction Output Settings: H2-01 and H2-02 (M1 – M4 Function Selection)
Inverter Overheat Pre-Alarm: “20”
If a multifunction output is programmed for this function the output is switched ON when the heatsink temper-
ature exceeds the overheat pre-alarm level set in L8-02.
Input Phase Loss Detection Level
For the Input Phase Loss Detection the drive monitors the DC bus ripple. The drive integrates this ∆V value
over 10 scans (appr. 10 seconds). If the integrated ∆V value of any consecutive ten scan range is greater than
the voltage determined by multiplying L8-06 times the drives rated OV Trip point (400Vdc/800Vdc), a PF
fault will occur and the Drive will coast to stop.
Con-
stant
Number
Name Description
Setting
Range
Factory
Setting
Change
during
Opera-
tion
Access
Level
L8-02 Overheat pre-alarm level
Sets the detection temperature for the Inverter overheat
detection pre-alarm in °C.
The pre-alarm is detected when the cooling fin tempera-
ture reaches the set value.
50 to 130 95°CNo A
L8-03
Inverter overheat (OH) pre-alarm
operation selection
Sets the operation for when the Inverter overheat
pre-alarm goes ON.
0: Decelerate to stop in deceleration time C1-02.
1: Coast to stop
2: Fast stop in fast-stop time C1-09.
3: Continue operation (Monitor display only.
4: OH alarm and output frequency reduction (L8-19)
A fault will be given in setting 0 to 2 and a minor fault will
be given in setting 3.
0 to 4 4 No A
L8-19
Frequency reference during OH
pre-alarm
Sets the frequency reference when OH pre-alarm is
detected in percent of the maximum frequency (E1-04).
0.0 to
20.0 %
20.0 % No A
t
L8-06
Phase Loss Fault
Signal
DC Bus
Voltage
10 seconds
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