Yaskawa F7 Modbus - Manual (Page 64)

F7U Parameters 4-25
Parameter Dependencies
Certain F7 drive parameters, Master parameters, can affect the default values, range of values and accessibility of other, dependent,
parameters. When a Master parameter’s value is changed via serial communications (RS232, RS485, DeviceNet, Ethernet, etc.,), the
associated dependent parameters are not automatically updated and must be updated serially. For example, parameter d2-02 (frequency
lower limit) affects the range of values for all frequency reference parameters (d1-01 through d1-17). If d2-02 is changed to 5.0 Hz serially,
all frequency reference parameters with values below 5.0 Hz must be updated serially to have current values of 5.0 Hz or greater. An F7
drive fault may occur if a dependent parameter’s value is not updated.
The standard sequence for changing F7 drive parameters is
■ Set A1-01 to 2 - Set the access value to Advanced
■ Set Master parameter to desired value
■ Send ENTER command
■ Set any dependent parameter values
■ Send ENTER command.
► Master Parameter Sequence Numbers
Some F7 drive parameters may be dependent on more than one Master parameter. For example o2-04 (kVA) and o2-09 (specification)
affect a number of parameters together. In these cases it is necessary that the parameter with the lowest sequence number be changed first.
The sequence table is shown below. Sequence numbers range From 1 through 9 with lower sequence parameters being changed before
parameters with higher sequence numbers. In all cases the parameter access level (o2-09) should be changed first.
Table 4.18 – Master Parameter Sequence Numbers
Prm Seq Name
Action after parameter change
Send ENTER command, power cycle F7 drive, change dependent parameters, send ENTER
o2-09 2 Initialization Mode
WARNING
Possible personal injury and/or damage to equipment may occur if o2-09 setting is change
from 1 (American Spec). o2-09 is a macro parameter that can change the default values of
terminal I/O and many other parameters. Consult with Yaskawa factory for details.
If o2-09 is also to be changed, set o2-09 before setting dependent or slave parameter values.
o2-04 1 kVA or F7 drive Model
A1-02 3 Control Method
C1-10 5 Acc/Dec Time Units
C6-01 4 Heavy/Normal Duty
C6-02 5 Carrier Frequency
d2-01 5 Freq Upper Limit
d2-02 5 Freq Lower Limit
E1-01 5 Input Voltage
L3-04 5 Stall Prevention @ DEC
L4-01 5 Speed Agree Detection Level
L4-02 5 Speed Agree Detection Width
L4-03 5 Speed Agree Detection Level ±
L4-04 5 Speed Agree Detection Width ±
L4-05 5 Operation @ Frequency Loss Detection
L8-02 5 Overheat Pre-Alarm Level
L8-15 5 OL2 @ Low Speed
All
Others
9
Send master parameter
Send ACCEPT
Change dependent parameters
Send ACCEPT