Yaskawa E7L Drive Bypass - Manual (Page 108)

Programming 5 - 16
b1-04 Reverse Operation
For some applications reverse motor rotation is not applicable and may even cause problems (e.g., air handling units,
pumps, etc.). Setting parameter b1-04 to 1 or 3 will cause the Drive to ignore any inputs for reverse operation. Setting
parameter b1-04 to either 2 or 3 will change the motor shaft rotation when a Forward Run command is given by exchanging
the order of the output phasing.
The factory default setting of parameter b1-04 is “1: Disabled”. When b1-04= “1: Disabled”, reverse operation is prohibited
and no exchanging of output phasing occurs.
It’s not immediately apparent how to program a reverse run function on the E7L. Cooling tower defrost initiated by a BAS contact
closure is an example. Here is one way to accomplish this:
As the unit ships from the factory, Drive terminals S6 and S7 are the only ones available for customer use. All others are
used for the bypass logic circuit.
A dry contact is wired between terminals TB5-2 and TB5-5, (if using Drive terminal S6), or TB5-2 and TB5-4, (if using
Drive terminal S7). Terminal S6 is not available if utilizing the PI function.
H1-04, (if using Drive terminal S6), or H1-05, (if using Drive terminal S7), is programmed for “Reverse Jog” (13).
d1-17 is programmed for the desired reverse jog speed.
b1-04 is programmed for “0: reverse enable.”
When the contact is closed, the motor will run in reverse at the speed programmed in d1-17.
b1-07 Local/Remote Run Selection
When the Drive is switched between the Local (Hand) mode (the digital operator) to the Remote (Auto) mode by the Hand/Off/
Auto selector, there is the possibility that a Run command is already present (i.e. a contact closure between
terminals TB1-2 and TB1-9. Parameter b1-07 determines whether the Drive will:
Ignore the external Run command until it is removed and re-instated (b1-07= “0: Cycle Extern Run”)
OR
Accept the already present Run command and immediately begin acceleration to the commanded speed
(b1-07= “1: Accept Extrn Run”).
Setting Description
0 Reverse Enabled
1 Reverse Disabled (factory default)
2 Exchange Phase
3 ExchgPhs, Rev Dsbl
Setting Description
0 Cycle Extern Run
1 Accept Extrn Run (factory default)
IMPORTANT
When switching from local mode to Auto mode when b1-07= “1:Accept Extrn Run” the Drive may start
unexpectedly if the Run command is already applied. Be sure all personnel are clear of rotating machinery
and electrical connections prior to switching between local mode and Auto mode.