Lenze MC1000 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”, requiring no connections
to the terminal strip. Refer to Section 13 - KEYPAD CONTROL.
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, forward/reverse,
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 fly back diode should be placed across the coil. Snubbers
are typically available from the manufacturer of the device.
14.2 START/STOP AND SPEED CONTROL
14.2.1 REMOTE MODE SELECTION
The REMOTE mode can be selected by one of two methods:
1. Program Parameter 30 - CONTROL to REMOTE, or:
2. Program CONTROL to BOTH, set the TB-13A or TB-13C function (see
Parameter 47 or 49) to LOCAL SELECT, and DO NOT make a contact closure
between TB-13A or TB-13C and TB-2 (making the contact closure will select
LOCAL mode).
WARNING!
If CONTROL is set to LOCAL, TB-1 is disabled and CANNOT be
used as a STOP switch! Incorrect use of TB-1 may result in damage
to equipment and/or injury to personnel! Refer to Parameter 30 -
CONTROL.