Delta VFD-B Series User Manual

Chapter 5 Parameters_VFD-B Series
5-88
Revision 10/2005, BE13, SW V4.08
08 - 17
Software Braking Level
(the Action Level of the Braking Resistor)
Unit: 1
Settings 230V series: 370 to 430V Factory Setting: 380
460V series: 740 to 860V Factory Setting: 760
575V series: 925 to 1075V Factory Setting: 950

This parameter sets the DC-bus voltage at which the brake chopper is activated.

This parameter will be invalid for models above 15kW/20hp for which VFDB brake unit must be used.
08 - 18
Base Block Speed Search
Factory Setting: 00
Settings 00 Speed search starts with last frequency command
01 Speed search starts with minimum output frequency (Pr.01-05)

This parameter determines the AC motor drive restart method after External Base Block is enabled.
Output fre qu ency
(H)
Ou tput voltage
(V)
FW D Run
B.B.
1
5
2
3
4
Fig 1: B.B. Spee d Search w ith La st Output Freq uency Downw ard Timing Chart
08-06
Base block time for
spe ed search
outp ut current
A
Time
1
2
Stop output voltage
3
Disable B.B. signal
4
Waiting time 08-06
Speed search
6
6
Synchronization speed detection
5
08-07
Current Limit for
Speed Search

Delta VFD-B Series Specifications

General

Series	VFD-B
Cooling Method	Fan cooling
Overload Capacity	150% for 60 seconds
Braking Unit	Built-in
Control Mode	V/F control, Sensorless Vector Control
Communication	RS-485
Protection Features	Overvoltage, Undervoltage, Overcurrent, Overload, Overtemperature, Short Circuit
Operating Temperature	-10°C to +50°C
Storage Temperature	-20°C to +60°C
Humidity	90% RH (non-condensing)
Altitude	1000m (Derating required above 1000m)