Yaskawa E7B Drive Bypass - Manual (Page 97)

Programming 5 - 3
Shaded Areas = Parameter settings required by the Bypass logic. The shaded Bypass Parameter Settings in Table 5.1 document
Drive parameter settings, required to interface with the Bypass logic circuit, that have been established at the factory and
stored in a dedicated location in the memory as “User Initialization” values (think of it as a “back-up file”).
Table 5.1 is also used to document parameters that have been factory set, for convenience, to typical values for fan and pump
applications. These parameters may be changed to meet the needs of the specific application.
If additional parameters are set to the specific needs of the application project, and the system operation has been checked and
verified, then the “User Initialization” values should be stored in memory again by selecting and entering “1: Set Default” in
parameter o2-03.
When there is a need for re-initialization of the “user” parameters (re-setting to the “User Initialization” values) of the Bypass
unit, then a “User Initialization” function should be carried out by selecting “1110: User Initialize” in parameter A1-03. This
will re-establish the drive set-up required for the Bypass application and any “user” parameter values that have been stored.
The factory parameter settings required to interface with the bypass logic circuit have also been stored in the digital keypad
memory. If there is a need for re-initialization (re-setting to a known factory starting point for trouble-shooting purposes) of
the Bypass unit, then the “back-up file” in the digital keypad memory can be copied to the drive. In parameter o3-01 select
“2: OP->INV WRITE” to carry out the copy function.
If Serial Communication is to be employed, the following parameter values are essential, see also Appendix D.
PARAMETER
NUMBER
SETTING
UNITS DESCRIPTION
KEYPAD DISPLAY
For Bypass Setting
For
Bypass
Drive
Default
H3-09 SEE
TABLE
5.2
2 N/A Terminal A2 Function Selection – Selects how this
input will be used by the Drive Terminal A2 Sel / Aux
Reference
H3-13 SEE
TABLE
5.2
0 N/A Master Frequency Reference Terminal Selection –
Determines which terminal (A1 or A2) will be the
main speed reference source. TA1/A2 Select / Main Fref
TA1
L4-05 0 1 N/A Frequency Reference Loss Detection Selection –
Determines Drive response to loss of the frequency
speed command Ref Loss Sel / Stop
L5-01 10.0 0 N/A Number of Re-start Attempts – Sets the number of
times the Drive will perform an automatic re-start Num of Restarts / (0-10)
L5-03 600 180 SEC Maximum Restart Time After Fault – If not success-
fully started after this time, restart attempts stop and
Drive faults Max Restart Time /
(.5-600.0)
o2-02 0 1 N/A OFF Key Function During Auto Run - Enables or dis-
ables the Off key. Oper STOP Key /
Disabled
o2-15 0 1 N/A Hand Key Function Selection - Enables or disables the
Hand and Auto keys. Hand Key / Disabled
o3-02 1 0 Read Allowed Selection – Enables or disables keypad
copy functions Read Allowable / Enabled
Serial Communication Significant Parameters
Protocol Option Code H5-02 H5-07 H5-08 H5-09
Metasys J 3 1 1 10
APOGEE FLN J 2 1 2 10
Modbus J 3 1 0 10
LonWorks L 3 0 0 10
Table 5.1 (Continued)Bypass Parameter Settings