SF01U 17
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.
NOTE
Control terminals provide basic isolation (insulation per EN 61800-5-1).
Protection against contact can only be assured by additional measures e.g.
supplemental insulation.
Strip off 0.20 to 0.25 inches (5 to 6 mm) of insulation for control wiring, and torque the terminals
to 2 lb-in (0.2 Nm). Be careful not to overtorque the 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 2.5kΩ up to 10kΩ.
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.
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