Lenze SCD Series - Manual (Page 19)

16
NOTE: When the drive is powered down, the input impedance of terminal TB-5/25 becomes 57
kilohms. If TB-5/25 was programmed as a 4-20 mA input, the 4-20 mA source will suddenly encounter
a high input impedance.
10.6 SPEED REFERENCE SELECTION
If only one speed reference is required, set Parameter 05 - STANDARD SPEED SOURCE to the
desired speed reference. The selections are: KEYPAD (the ! and " buttons on the front of the
drive), PRESET SPEED #1 (Parameter 31), a 0-10 VDC signal, or a 4-20 mA signal.
If multiple speed references are required, terminals 13A, 13B, and 13C can be programmed to select
other speed references in addition to the STANDARD SPEED SOURCE (Parameter 05). When the
TB-13 terminal is closed to TB-4, the drive will follow the selected speed reference. If a speed
reference is not selected using TB-13A, 13B, or 13C, speed control will default back to the source
programmed in STANDARD SPEED SOURCE.
When using the DeviceNet interface, speed reference selection can be done as described above.
However, DeviceNet can override the selected speed reference and directly control the drive speed.
Refer to Appendix B - DEVICENET CONTROL for more information.
0 - 10 VDC and 4 - 20 mA INPUT SIGNALS
TB-13A, TB-13B, and TB-13C can all be programmed to select a 0-10 VDC or 4-20 mA analog
speed reference input.
PRESET SPEEDS
TB-13A can be programmed to select PRESET SPEED #1, TB-13B to select PRESET SPEED #2,
and TB-13C to select PRESET SPEED #3. There are a total of seven preset speeds, which are
activated by different combinations of contact closures between TB-13A, 13B, 13C and TB-4. Refer
to Parameters 31-37 in Section 15.0 - DESCRIPTION OF PARAMETERS.
JOG
TB-13B can be programmed to select either JOG FORWARD or JOG REVERSE. The Jog speed is
set by PRESET SPEED #2. Close TB-13B to TB-4 to JOG, and open the contact to STOP.
NOTE: If the drive is commanded to JOG while running, the drive will enter JOG mode and run at
PRESET SPEED #2. When the JOG command is removed, the drive will STOP.
WARNING!
When operating in JOG mode, the STOP terminal (TB-1) and the STOP key (on the optional remote
keypad) WILL NOT stop the drive. To stop the drive, remove the JOG command.
JOG REVERSE will operate the drive in reverse rotation even if ROTATION DIRECTION (Parameter
17) is set to FORWARD ONLY.