EM11 User’s Manual
5. Description of Function Codes
81
(Err16). At normal application, it will be set as invalid. If in the continuous communication system, setting
this parameter, you can monitor the communication status.
Code
Parameter Name
Setting Range
Default
bA-06
Modbus protocol
data transmission
format selection
Unit's digit: Modbus protocol.
0: Non-standard Modbus protocol
1: Standard Modbus protocol
1
bA-06=1: Select standard Modbus protocol.
bA-06=0: When reading the command, the slave machine return is one byte more than the standard Modbus
protocol’s, for details, refer to communication data structure of appendix .
Code
Parameter Name
Setting Range
Default
bA-07
Communication
reading current
resolution
0: 0.01A
1: 0.1A
0
It is used to confirm the unit of current value when the communication reads the output current.
5.12 Group bb: Fault and Protection
Code
Parameter Name
Setting Range
Default
bb-00
G/P type selection
0: P type
1: G type
1
This parameter is used to display the delivered model and cannot be modified.
0: Applicable to variable torque load (fan and pump) with rated parameters specified.
1: Applicable to constant torque general load with rated parameters specified.
Code
Parameter Name
Setting Range
Default
bb-01
Motor overload
protection selection
0: Disabled
1: Enabled
0
bb-02
Motor overload
protection gain
0.20~10.00
1.00
bb-01 =0
The motor overload protective function is disabled. The motor is exposed to potential damage due to
overheating. A thermal relay is suggested to be installed between the frequency inverter and the motor.
bb-01 = 1
The frequency inverter judges whether the motor is overloaded according to the inverse time-lag curve of the
motor overload protection.
The inverse time-lag curve of the motor overload protection is:
220% × (bb-02) × rated motor current
(if the load remains at this value for one minute, the frequency inverter reports motor overload fault), or
150% × (bb-02) ×rated motor current
(if the load remains at this value for 60 minutes, the frequency inverter reports motor overload fault).
Set bb-02 properly based on the actual overload capacity. If the value of bb-02 is set too large, may result in
damaging to the motor because the motor overheats but the frequency inverter does not report the alarm.
5. Description of Function Codes
EM11 User’s Manual
82
Code
Parameter Name
Setting Range
Default
bb-03
Motor overload
pre-warning
coefficient
50%~100%
80%
This function is used to give a warning signal to the control system via DO before motor overload protection.
This parameter is used to determine the percentage, at which pre- warning is performed before motor
overload. The larger the value is, the less advance the pre-warning will be.
When the output current of the frequency inverter is greater than the value of the overload inverse time-lag
curve multiplied by bb-03, the DO terminal of the frequency inverter set with motor overload pre-warning
becomes ON.
Code
Parameter Name
Setting Range
Default
bb-04
Overvoltage stall
gain
0~100
0
bb-05
Overvoltage stall
protective voltage
120%~150%
130%
When the DC bus voltage exceeds the value of bb-05 (Overvoltage stall protective voltage) during
deceleration of the frequency inverter, the frequency inverter stops deceleration and keeps the present
running frequency. After the bus voltage declines, the frequency inverter continues to decelerate.
bb-04 (Overvoltage stall gain) is used to adjust the overvoltage suppression capacity of the frequency
inverter. The larger the value is, the greater the overvoltage suppression capacity will be. In the prerequisite
of no overvoltage occurrence, set bb-04 to a small value.
For small-inertia load, the value should be small. Otherwise, the system dynamic response will be slow. For
large-inertia load, the value should be large. Otherwise, the suppression result will be poor and an
overvoltage fault may occur.
If the overvoltage stall gain is set to 0, the overvoltage stall function is disabled. The overvoltage stall
protective voltage setting 100% corresponds to the base values in the following table:
Voltage Class
Corresponding Base Value
Single-phase 220 V
290 V
Three-phase 220 V
290 V
Three-phase 380 V
530 V
Three-phase 480 V
620 V
Three-phase 690 V
880 V
Code
Parameter Name
Setting Range
Default
bb-06
Over current stall
gain
0~100
20
bb-07
Over current stall
protective current
100%~200%
150%
Over current stall: When the output current exceeds the over current stall protective current (bb-07) during
acceleration/deceleration of the frequency inverter, the frequency inverter stops acceleration/deceleration
and keeps the present running frequency. After the output current declines to below bb-07, the frequency
inverter continues to accelerate/decelerate.
bb-07 (over current stall protective current) is used to select the current protection value of over current stall
