User Manual - Firmware 1.xxx-6.xxx Instruction Manual

6–22 Programming
Feature Select
[FStart Forward]
This value sets the frequency at which the forward speed
search begins. If this value exceeds [Maximum Freq],
speed search will begin at [Maximum Freq]. Forward
search ends at zero Hertz or when motor speed is found.
Parameter Number 156
Parameter Type Read and Write
Display Units / Drive Units 1 Hertz / Hertz
Factory Default 60 Hz
Minimum Value 0 Hz
Maximum Value 400 Hz
[FStart Reverse]
This value sets the frequency at which the reverse speed
search begins. If this value exceeds [Maximum Freq],
speed search will begin at [Maximum Freq]. Reverse
search ends at zero Hertz or when motor speed is found.
Parameter Number 157
Parameter Type Read and Write
Display Units / Drive Units 1 Hertz / Hertz
Factory Default 0 Hz
Minimum Value 0 Hz
Maximum Value 400 Hz
[LLoss Restart]
This parameter selects the reconnect mode after recovery
from a line loss condition.
Parameter Number 228
Parameter Type Read and Write
Factory Default “Track Volts”
Units
Display Drive
“Speed Search” 1 Frequency sweep
“Use Encoder” 2 Read feedback
“Track Volts” 3 Read motor volts
Firmware 5.001 & later “Speed Srch 10s” 4 Frequency sweep takes 10 seconds
Firmware 5.001 & later “Speed Srch 20s” 5 Frequency sweep takes 20 seconds
Firmware 5.001 & later “Speed Srch 40s” 6 Frequency sweep takes 40 second
Drive Units=“4” Firmware 4.001 & before “Last Speed” 7 Start at last output
[Line Loss Mode]
This parameter sets the drive reaction to a loss of input
voltage and is often referred to as Inertia Ride Through.
If the drive is used to determine loss of AC input (as op-
posed to an external device), it will monitor the falling DC
bus voltage. When Vbus falls below 85% of nominal, a
“line loss” condition is issued and an alarm bit is set.
The line loss mode selected, along with [Line Loss Fault]
and [Low Bus Fault] will determine the drives response to
a loss of input.
• With this parameter set to “LoBus>Off” and . . .
[Line Loss Fault] is . . .
- Enabled a fault is issued 0.5 seconds after a “line
loss” condition.
- Disabled a fault will not be issued.
[Low Bus Fault] is . . .
- Enabled a fault is issued at the bus undervoltage
trip level.
- Disabled a fault will not be issued.
• With this parameter set to “LoBus>Decel” and [Line
Loss Fault] & [Low Bus Fault] are disabled – the drive
will decelerate the output frequency following motor
speed to create a regenerative condition that maintains
Vbus at 85% nominal. The amount of available me-
chanical energy determines the length of “ride
through.”
If this parameter = “LoBus>Off,” then [LLoss Restart] de-
termines the reconnect scheme for the motor. If this
parameter is set to “LoBus>Decel,” no reconnect scheme
is required.
Parameter Number 256
Parameter Type Read/Write
Factory Default “LoBus>Off”
Units
Display Drive
“LoBus>Off” 0 Turn off output on –15% Vbus
“Input>Off” 1 Not functional at time of printing.
Turns off output on
High Speed Input = True
“LoBus>Decel” 2 Regulates Vbus using deceleration
Active on –15% Vbus
“Input>Decel” 3 Not functional at time of printing.
Regulates Vbus using deceleration
Active on High Speed Input = True