15
10.0
CONTROL WIRING
10.1
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.
Strip off 0.20 to 0.25 inches of insulation for control wiring. 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.
10.2
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.
10.3
SURGE SUPPRESION 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.
10.4
START/STOP CONTROL
There are various control schemes that allow for 2-wire and 3-wire Start/Stop circuits. Refer to the
wiring diagrams in Section 11.0 - SCF CONTROL WIRING DIAGRAMS
10.5
SPEED REFERENCE SIGNALS
The drive allows for three analog speed reference inputs:
SPEED POT
Connect the wiper of a speed pot to terminal TB-5, and connect the high and
low end leads to terminals TB-6 and TB-2, respectively. The speed pot can be
2.5k
Ω
up to 10k
Ω.
0-10 VDC
Wire the positive to terminal TB-5 and the negative to terminal TB-2. TB-5 input
impedance is 120 kilohms.
4-20 mA
Wire the positive to terminal TB-25 and the negative to terminal TB-2. TB-25 input
impedance is 100 ohms.
