Specifications

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14.0 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 13.0 (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.
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 SUPPRESION ON RELAYS
Current and voltage surges and spikes in the coils of contactors, relays, and solenoids,
near or connected to the drive can cause erratic drive operation. A snubber circuit should be
used on relay and contactor coils associated with the inverter. For AC loads, snubbers
should consist of a resistor and a capacitor in series across the coil. For DC loads, a free-
wheeling or flyback diode should be placed across the coil.