14.2.5 SPEED REFERENCE SIGNALS
The drive allows for three analog speed reference inputs: a speed potentiometer (10,000 Ohm), 0-10 VDC,
or 4-20 mA.
SPEED POT Connect the wiper to terminal TB-5A, and connect the high and low end leads to
terminals TB-6 and TB-2, respectively.
0-10 VDC Wire the positive to terminal TB-5A and the negative to terminal TB-2. TB-5A input
impedance is 200 kilohms.
4-20 mA Wire the positive to terminal TB-5B and the negative to terminal TB-2. TB-5B input
impedance is 100 ohms.
NOTE: When an external speed reference signal (remote speed pot, 0-10 VDC or 4-20 mA signal) is used,
minimum and maximum speed references are determined by the user programmed or default settings in
parameters 39 (TB-5 MIN) and 40 (TB-5 MAX), not parameter 10 (MIN FRQ) or 11 (MAX FRQ).
14.2.6 SPEED REFERENCE SELECTION
AUTO/MAN vs. LOCAL/REMOTE
In the MICRO Series drive, AUTO/MAN refers to speed control, and LOCAL/REMOTE refers to
START/STOP control. AUTOMATIC or MANUAL speed control selection is affected by whether the
drive is in LOCAL or REMOTE mode.
In LOCAL mode (keypad start/stop control), AUTOMATIC and MANUAL speed control is selected using
Parameter 28 - AUTO/MAN. When set to BOTH, the AUTO/MAN button the keypad is active and is
used to toggle between MANUAL (keypad or speed pot) and AUTOMATIC (0-10 VDC, 4-20 mA, or
preset speeds) speed control. When set to MANUAL, speed control is governed by Parameter 29 -
MANUAL, which selects either KEYPAD or 0-10 VDC (speed pot). When set to AUTOMATIC, one of
the TB-13 input selects must be set to the desired speed reference, and that terminal must be closed to
TB-2. The drive will then respond to the automatic speed reference. If one of the TB-13 input selects is set
for a speed reference, and the contact closure is not made to TB-2, speed control will remain in AUTO
mode, but the drive will respond to the keypad or speed pot, depending on Parameter 29 - MANUAL.
Therefore, if the Form C relay or open-collector outputs are set to indicate AUTO/MAN mode, they will
still indicate AUTO mode.
In REMOTE mode (terminal strip start/stop control), speed control is selected using the TB-13 input
selects. For AUTOMATIC speed control, one of the TB-13 input selects must be set to the desired speed
reference, and that terminal must be closed to TB-2. The drive will then respond to the automatic speed
reference. If none of the TB-13 input selects are closed to TB-2, speed control will default to MANUAL
mode, and the drive will respond to the keypad or speed pot, depending on Parameter 29 - MANUAL. This
will cause the Form C relay or open-collector outputs to indicate MANUAL mode if set to indicate
AUTO/MAN mode.
0 - 10 VDC and 4 - 20 mA INPUT SIGNALS
TB-13A, TB-13B, and TB-13C can all be programmed for 0-10 VDC or 4-20 mA input.
PRESET SPEEDS
TB-13A can be set to SPEED #1, TB-13B to SPEED #2, and TB-13C to SPEED #3. Closing any two of
these terminals to TB-2 will select SPEED #4. Refer to Parameters 1-4: SPEED #1 - #4 in Section 18.0 -
DESCRIPTION OF PARAMETERS.
34
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