Inverter Protection; Inverter Overheat Protection; Input Phase Loss Detection Level - YASKAWA Varispeed E7 Instruction Manual And Parameter Description

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
Con-
stant Name
Number
L8-02 Overheat pre-alarm level
Inverter overheat (OH) pre-alarm
L8-03
operation selection
Frequency reference during OH
L8-19
pre-alarm
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.
Phase Loss Fault
Signal
DC Bus
Voltage
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Description
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.
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.
Sets the frequency reference when OH pre-alarm is
detected in percent of the maximum frequency (E1-04).
10 seconds

Inverter Protection

Change
Setting Factory during Access
Range Setting Opera- Level
tion
50 to 130 95°C No
0 to 4 4 No
0.0 to
20.0 % No
20.0 %
L8-06
t
A
A
A
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