STEP ET Series - Page 137

Chapter 7 Parameter Explanation
ET/EP/EH Series Intelligent Flexible Driver Manual
- 127 -
Function code
Name
Setting range
Factory setting
threshold (V)
P70.07
Overspeed protection coefficient
(%)
0.00~655.35
120.00
P70.04 - P70.06 set thresholds for over-current and over-voltage of the inverter. Under normal
circumstances, when the set velocity or motor load changes sharply, the output current of the
inverter may reach above the overcurrent protection point, resulting in an overcurrent failure. The
current limiting function is that the inverter controls the instantaneous output, and limits the rapidly
changing output current not to exceed the protection action value, thereby effectively reducing
overcurrent faults and ensuring continuous and reliable operation of the system. When the current
exceeds a certain value (P70.04), the inverter enters the current-limited state; when running at a
constant velocity, the load capacity is stable through current limiting, and there will be no
overcurrent fault. When the load becomes lighter, it will automatically exit the current limiting state
and resume normal work. This function is especially suitable for the situation of rapid change of
velocity or load.
P70.07 sets the overspeed protection value. When the time exceeds the set value of P94.04, the
30#fault will be reported.
Function code
Name
Setting range
Factory setting
P70.08
Special function selection
0~65535
6
Bit0: Overcurrent frequency reduction. Setting this bit to 1 enables the function. Function settings can be set via
parameter P70.23~P70.27.
Bit1: Overtemperature frequency reduction. Setting this bit to 1 enables the function. Function settings can be set via
parameter P70.29~P70.33.
Bit2: Variable carrier function. Setting this bit to 1 enables the function. Radiator temperature higher than 80 and the
temperature rises every 2 degrees, carrier frequency reduces 1kHz (lower limit 2kHz)
Bit6: Undervoltage fault not recorded. Setting this bit to 1 enables the function.
Bit11: GVC energy-saving mode. Setting this bit to 1 enables the function.
Bit13: KEB function. Setting this bit to 1 enables the function. When powered off, motor reduces the speed and
generates electricity, compensating the bus voltage and prolonging the trigger time of the undervoltage alarm.
Function code
Name
Setting range
Factory setting
P70.10
PT signal channel
0~3
0
P70.11
PT protection upper threshold
(V)
0.0~1000.0
150.0
P70.12
PT protection lower threshold(V)
0.0~1000.0
0.0
P70.13
PT protection action delay
time(s)
0.0~10.0
3.0
P70.10 selects the channel of PT signal (0: NC; 1: PT1000/PT100; 2: PTC high resistance; 3: PTC
low resistance).
Standard IO board supports the protection logic for high and low resistance of PT1000 and PTC.
Optional board supports the IO board of PT100 and can support PT100.
Trigger conditions for fault No. 49 (PT detect fault): "PT value > P70.11" or "PT value < P70.12"
for 5 seconds (P70.13 not used);
Clearing conditions for fault No. 49 (PT detect fault): After 5 seconds of a fault, "P70.12 < PT value
P70.11", clear the fault.
Function code
Name
Setting range
Factory setting