N700E INSTRUCTION MANUAL
3-39
b31
RXP-RXN terminal Communication Baud Rate
1: 2,400 bps
2: 4,800 bps
3: 9,600 bps
4: 19,200 bps
Select a baud rate for the RXP-RXN terminal communication RS485 channel
Related Parameters:
b32
BRD Mode
0: Disabled
1: Only during VFD Running
2: Always
This BRD function is only applicable to N700E models under 22kW(30 HP)
Regenerative energy from the motor is dissipated by the heat through this braking
resistor module.
Related Parameters:
b33
BRD Duty Cycle
Range: 0.0 ~ 50.0 % in 0.1 %
Select a percentage value of total BRD on time before the overheating fault occurs
Related Parameters:
BRD
Activated
t1
t2
t3
Total RunTime
BRD Usage Rate
t1 + t2 + t3
Total RunTime
=
X 100
1 Sec
100 Sec
4 Sec
2 Sec
2 Sec
100 Sec
5 Sec
3 Sec
Example: 10%
=> Over heat Trip (E06)
=> BRD Normal Operation
b34 ~ 41 Overvoltage Suppression(OVS) Function
The Overvoltage Suppression (OVS) feature will over speed the motor up to the Maximum OVS Output
Frequency (b34) to prevent motor regeneration and creating an Overvoltage Fault. If the OVS runs at
maximum frequency for longer than the Limit Time (b41), the unit will fault on E02.
OVS Functional Description
By calculating torque in real time, reduce regeneration energy by increasing speed.
For speed control, PI controller is applied.
If torque is bigger than 0, “PI Out” become 0 by “PI Limiter”; no increase in frequency value
If torque is lower than 0, “PI Out” would be increased to “Max Add Req”; frequency value increased
If output of PI controller is reached to b34(Max Add Freq) The counter is started.
When the value of counter is reached to b41 (wRegen Time), the trip(E02) will be occur.