Lenze MCH Series - Manual (Page 38)

34 13435744_EDBMH01_v13
14.2.3 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.
14.2.4 SPEED REFERENCE SELECTION
In HAND mode, the speed reference source will be determined by the setting of
Parameter 29 - HAND SOURCE.
In AUTO mode, the speed reference source will be determined by the setting of
Parameter 24 - AUTO SOURCE.
The SPEED SOURCE key on the keypad can be used to change the speed reference
source. When NORM SRC is selected the above statements are true. However, the
SPEED SOURCE key can also be used to select HAND ONLY or AUTO ONLY, which
forces the drive speed to be controlled from the HAND SOURCE (Parameter 29) or the
AUTO SOURCE (Parameter 24), regardless of whether the drive is in HAND or AUTO
mode.
Speed references can also be selected using TB-13A, 13B and 13C on the terminal
strip. If HAND SOURCE and/or AUTO SOURCE are set to SELECTED, the speed
source will be whatever speed reference is selected using TB-13A, 13B or 13C (0-10
VDC, 4-20 mA, preset speeds, etc). Refer to Parameters 47, 48 and 49 in Section 18.0
- DESCRIPTION OF PARAMETERS.
0 - 10 VDC and 4 - 20 mA INPUT SIGNALS
HAND SOURCE (Parameter 29) and AUTO SOURCE (Parameter 24) can be set for
0-10 VDC or 4-20 mA.
If HAND SOURCE and/or AUTO SOURCE are set to SELECTED, TB-13A, TB-13B,
and TB-13C can all be used to select 0-10 VDC or 4-20 mA input.
PRESET SPEEDS
HAND SOURCE (Parameter 29) and AUTO SOURCE (Parameter 24) can be set to
PRESET #1 - PRESET #4.
If HAND SOURCE and/or AUTO SOURCE are set to SELECTED, TB-13A can be
programmed to select PRESET #1, TB-13B to select PRESET #2, and TB-13C to
select PRESET #3. Closing any two of these terminals to TB-2 will select PRESET
#4. Refer to Parameters 1-4: PRESET #1 - #4 in Section 18.0 - DESCRIPTION OF
PARAMETERS.
MOP - MOTOR OPERATED POT
MOP allows the drive speed to be adjusted using contact closures (one for increase
and another for decrease).
HAND SOURCE (Parameter 29) and AUTO SOURCE (Parameter 24) can be set
to MOP. This requires that TB-13A (Parameter 47) be set to DECREASE FREQ,
and TB-13B (Parameter 48) be set to INCREASE FREQ. Close TB-13A to TB-2 to
decrease the drive speed, and close TB-13B to TB-2 to increase the drive speed.