Lenze MC3000 Series - Manual (Page 33)

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14 CONTROL WIRING
14 .1 GENERAL
14 .1 .1 kEYPAD CONTROL
The drive can be controlled by the keypad or by control devices wired to the terminal
strip . The drive will run from the keypad “out of the box”, as long as the factory jumper
between TB-1 and TB-2 is present, as shown below . If the jumper is not present, add
one, otherwise the drive will not start from the keypad . Refer to Section 13 - kEYPAD
CONTROL .
FACTORY JUMPER
1 2 5A 5B 6 10A 12A RXA TXB 10B 2 13A 13B 13C 13D 14 15 2
16 17 18
14 .1 .2 CONTROL WIRING VS . POWER WIRING
External control wiring MUST be run in a separate conduit away from all other input and
output power wiring . If control wiring is not kept separate from power wiring, electrical
noise may be generated on the control wiring that will cause erratic drive behavior . Use
twisted wires or shielded cable grounded at the drive chassis ONLY . Recommended
control wire is Belden 8760 (2-wire) or 8770 (3-wire), or equivalent .
Torque the control terminals to 2 lb-in (0 .2 Nm) . Be careful not to overtorque the control
terminals, as this will cause damage to the terminal strip . This is not covered under
warranty and can only be repaired by replacing the control board .
14 .1 .3 TB-2: CIRCUIT COMMON
The TB-2 terminals are used as circuit common for the start/stop, input select, local/remote,
analog input, and analog output functions . There are three TB-2 terminals available on
the terminal strip, and they are all internally connected to each other on the main control
board . If necessary TB-2 may be connected to chassis ground .
NOTE
TB-2 MUST be connected to chassis ground when using serial
communications .
14 .1 .4 SURGE SUPPRESSION ON RELAYS
Current and voltage surges and spikes in the coils of contactors, relays, solenoids, etc,
near or connected to the drive, can cause erratic drive operation . Therefore, a snubber
circuit should be used on coils associated with the drive . For AC coils, snubbers should
consist of a resistor and a capacitor in series across the coil . For DC coils, a free-wheeling
or flyback diode should be placed across the coil . Snubbers are typically available from
the manufacturer of the device .