Delta VFD-L Series User Manual

5
VFD-L Series
DELTA ELECTRONICS, INC. ALL RIGHTS RESERVED
5-37
2. DC Braking during stopping is used to decrease stopping time and also to hold a
stopped load in position. For high inertial loads, a dynamic braking resistor
may be needed for quick decelerations.
8 - 04
M
omentary Power Loss Operation Selection Factory Setting: d 0
Settings d 0 Operation stopped after momentary power loss
d 1 Operation continues after momentary power loss
Speed search start with the Master Frequency reference
value
d 2 Operation continues after momentary power loss
Speed search starts with the min frequency
8 - 05
M
aximum Allowable Power Loss Time
F
actory Setting: d 2.0
Settings d 0.3 to d 5.0Sec Unit: 0.1Sec

During a power loss, if the power loss time is less than the time defined by this
parameter, the AC drive will resume operation. If the Maximum Allowable Power Loss
Time is exceeded, the AC drive output is then turned off.
8 - 06
B
ase-Block Time for Speed Search
F
actory Setting: d 0.5
Settings d 0.3 to d 5.0Sec Unit: 0.1Sec

When a momentary power loss is detected, the AC drive turns off for a specified time
interval determined by Pr.8-06 before resuming operation. This time interval is called
Base-Block. This parameter should be set to a value where the residual output voltage
is nearly zero, before the drive resumes operation.

This parameter also determines the searching time when performing external
Base-Block and fault reset.
8 - 07
M
aximum Speed Search Current Level
F
actory Setting: d 150
Settings d 30 to d 200
¦
Unit: 1%

Following a power failure, the AC drive will start its speed search operation, only if the
output current is greater than the value determined by Pr.8-07. When the output
current is less than that of Pr.8-07, the AC drive output frequency is at a “speed
synchronization point”. The drive will start to accelerate or decelerate back to the
operating frequency at which it was running prior to the power failure.

Delta VFD-L Series Specifications

General

Control Method	V/F Control
Output Voltage	0 to Input Voltage
Cooling Method	Fan Cooling
Enclosure Rating	IP20
Overload Capacity	150% for 60 seconds
Protection	Over-voltage, Over-current, Overheat, Under-voltage, Short circuit
Braking Unit	Built-in
Operating Temperature	-10°C to 50°C (14°F to 122°F)
Digital Inputs	5 programmable digital inputs
Analog Input	0-10V, 4-20mA
Communication Interface	RS-485 (Modbus)
Storage Temperature	-20°C to 60°C (-4°F to 140°F)
Humidity	90% RH, non-condensing
Altitude	Up to 1000m without derating
Input Voltage	200-240V, 380-480V