Franklin Electric CERUS X-DRIVE CXD-003A-4V, Installation And Operation Manual, Page: 68 / 252

OPERATION
Control Options
68
Step Frequencies
The VFD can be operated in a selection of up to 15 user defined pre-set frequencies (speeds) through a com -
bination of switched digital inputs
[IO-21] ~ [IO-28]
. These speeds are defined through parameters
[VFD-04] to
[VFD-18] .
When a run command is present, selection of a step frequency overrides any previously active speed refer -
ence.
The switching combinations for step frequency selection are as follows:
Shutdown
The Shutdown feature uses a Digital Input signal (MI1-MI8) from an external source to stop VFD output in the
event of an emergency. The VFD will trip on Shutdown when the DI signal is activated. This function over -
rides all other functions and VFD cannot be started with any HOA change until stop signal is removed.
Two options are available for restarting:
Latching Mode [IO–21] through [IO-28]: The Shutdown signal must be removed and the Shutdown fault
must be manually reset; no auto restarts or retries are available. The VFD can then be restarted with a
RUN
command. To enable this function, connect the external emergency stop signal to one of the Digital Inputs
(
MI1–MI8
) and set the corresponding parameter to
36_Shutdown Latched
.
Non-Latching Mode [IO–21] through [IO-28]: If a RUN command is present when the Shutdown signal is
removed, the VFD will restart based on HOA mode. To enable this function, connect the external emergency
stop signal to one of the Digital Inputs (
MI1–MI8 ) and set the corresponding parameter to 35_Shutdown N-Latch .
Only one Digital Input can be set to Shutdown.
Standard Operation with an Automated Control System
In many VFD applications, including ventilation, water supply, or irrigation, motor speed is often determined
by an automated system such as a BAS, BMS, or PLC. These systems provide control information to the VFD
either through a communications protocol such as Modbus or BACnet, or through direct electrical connec
-
tion to one of the analog input terminals.
Input Selection
Parameter Step Speed
Speed L Speed M Speed H Speed X
1 0 0 0 [VFD-04] Speed 1
0 1 0 0 [VFD-05] Speed 2
1 1 0 0 [VFD-06] Speed 3
0 0 1 0 [VFD-07] Speed 4
1 0 1 0 [VFD-08] Speed 5
0 1 1 0 [VFD-09] Speed 6
1 1 1 0 [VFD-10] Speed 7
0 0 0 1 [VFD-11] Speed 8
1 0 0 1 [VFD-12] Speed 9
0 1 0 1 [VFD-13] Speed 10
1 1 0 1 [VFD-14] Speed 11
0 0 1 1 [VFD-15] Speed 12
1 0 1 1 [VFD-16] Speed 13
0 1 1 1 [VFD-17] Speed 14
1 1 1 1 [VFD-18] Speed 15