Manual

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 (5 to 6 mm) of insulation for control wiring, and 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.
10.2 TB-2: CIRCUIT COMMON
The TB-2 terminal is used as circuit common for the analog speed reference inputs. If necessary TB-2
may be connected to chassis ground.
10.3 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.
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 - SM Series
™
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 250 ohms.
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