STEP ET Series - Page 138

Chapter 7 Parameter Explanation
Shanghai Sigriner STEP Electric Co., Ltd.
- 128 -
Function code
Name
Setting range
Factory setting
P70.19
Bus undervoltage threshold (V)
0~540
380
The default bus undervoltage threshold for 400V class inverter is 380V.
Function code
Name
Setting range
Factory setting
P70.20
Power grid imbalance threshold
(%)
10.0~200.0
50.0
Determine the power grid imbalance fault according to the power grid voltage sampling, the
threshold can be set according to the on-site power grid conditions.
Function code
Name
Setting range
Factory setting
P70.21
PWM detection delay (ms)
0~65535
800
After the inverter runs, if the output current is 0, the inverter will report 51# fault after the delay of
parameter PWM detection.
Function code
Name
Setting range
Factory setting
P70.23
Current-limiting frequency
reduction threshold (%)
50~200
120
P70.24
Current limiting KP
0~65.535
0.001
P70.25
Current limiting Ki
0~6.5535
0.0001
P70.26
Current limiting OutMin
0.000~1.000
0.005
P70.27
Current limiting recovery
threshold
0~65535
10
P70.23 - P70.27 are overcurrent frequency reduction related parameters, Bit0 setting of P70.08 is
required to enable this function. If current exceeds P70.23, the frequency reduction function is enabled.
Function code
Name
Setting range
Factory setting
P70.28
Power grid overvoltage threshold
0~530
530
P70.29
Overtemperature frequency
reduction starting temperature
0~100.0
91.0
P70.30
Over-temperature frequency
reduction recovery temperature
0~100.0
80.0
P70.31
Over-temperature frequency
reduction slope
0~65535
1
P70.32
Up-frequency overtemperature
threshold
0~100.0
88.0
P70.33
Overtemperature detection
interval
0~655.35
20.00
When Bit1 of P70.08 is 1, the overtemperature frequency reduction function is enabled;
When the module temperature exceeds P70.32 (up-frequency overtemperature threshold), the speed
curve pauses and up-frequency stops;
When the module temperature is higher than P70.29 (overtemperature frequency reduction starting
temperature), frequency reduction starts, up to the lower limit frequency, with frequency reduction
cycle being P70.33 and each frequency reduction quantity being P70.31;
When the module temperature is lower than P70.30, frequency reduction ends, and according to the