YASKAWA CIPR-GA50C series Technical Manual page 473

Note:
• If the mechanical operation of the holding brake is slow, use DC Injection Braking until the brake is fully closed to prevent rollback.
• If you cannot hold the load with DC Injection Braking when it is stopped in V/f Control and Open Loop Vector Control modes, use
Dwell Function at Stop.
–b6-03 [Dwell Reference at Stop]: Minimum output frequency to 3.0 Hz
When Frequency Detection 2 is OFF, it is less than L4-01 [Speed Agree Detection Level] - L4-02 [Speed Agree Detection Width].
–b6-04 [Dwell Time at Stop] recommended setting: 0.3 s to 0.5 s
–b2-04 [DC Inject Braking Time at Stop] recommended setting: 0.0 s
Analog Input FilterTime Constant
When b1-01 = 1 [Frequency Reference Selection 1 = Analog Input], it adds noise to the analog frequency
reference during run.
• Minimize the effects of noise.
• Change H3-13 [Analog Input FilterTime Constant] to a range of 0.01 s to 0.10 s.
Startup Current Check
When you do a test run, set L8-41 =1 [High Current Alarm Selection = Enabled] and use U4-13 [Peak Hold
Current] and a clamp ammeter with the machine under load and not under load to check the motor current during
start up.
If the motor torque is not sufficient during start up or if the timing between the motor and the holding brake is
unsatisfactory and causes the motor to lock, a large quantity of current will flow. In these conditions, adjust the
parameters again and decrease the load to decrease the current to less than 150%. If the current flow is more than
150% of the drive rated current, the heat stress on the IGBTs will decrease the service life of drive parts.
To decrease the effects of heat stress, decrease the carrier frequency of the drive to 2.0 kHz to 2.5 kHz for
applications where low audible noise is not necessary.
Overvoltage Suppression Function
If the overvoltage suppression function is used in elevator type applications, there is a risk of rollback and falls.
Set L3-11 = 0 [Overvoltage Suppression Select = Disabled].
The overvoltage suppression function is designed to prevent an overvoltage trip in a situation in which a braking
resistor is not used with a regenerative load. If the overvoltage suppression function is enabled, the regeneration
torque reference within the drive is automatically controlled during regeneration.
Note:
When using the drive for applications such as high speed elevators with a speed of 2 ms or more and direct drive elevators, or when you
need drives designed for cranes, contact Yaskawa or your Yaskawa sales representative.
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A1-07: DriveWorksEZ Function Selection
No.
Name
(Hex.)
A1-07 DriveWorksEZ Function
Selection
(0128)
DriveWorksEZ is a simple visual programming tool that lets you connect function blocks to customize the drive
and add PLC functions.
Note:
• DriveWorksEZ will overwrite drive settings when it uses MFDI/MFDO and MFAI/MFAO. When you use DriveWorksEZ to make
changes to the drive, the changes will stay after you disable DriveWorksEZ.
• For more information about DriveWorksEZ, contact Yaskawa or your nearest sales representative.
0 : DWEZ Disabled
1 : DWEZ Enabled
2 : Enabled/Disabled wDigital Input
YASKAWA SIEPC71061753A GA500 Technical Manual
Figure 12.6 DC Injection Braking at Stop Function
V/f OLV OLV/PM AOLV/PM EZOLV OLV/PM
Sets the drive to operate with DriveWorksEZ.
12.2 A: Initialization Parameters
Description
Default
(Range)
0
(0 - 2)
12
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