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10 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 or 8770, 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 AND TB-4

The TB-2 terminals are the circuit common for the analog input and analog output functions.

The TB-4 terminals are the reference for all of the digital inputs (TB-1, 13A, 13B, 13C, and

13D). The digital inputs are active-high as standard, but can be conﬁgured for active-low

during initial set-up. Refer to APPENDIX B - INPUT ASSERTION LEVEL. When set for

active-high, TB-4 is at +12 VDC.

NOTE

TB-2 may be connected to chassis ground if noise is a concern. TB-2 must

be connected to chassis ground when using serial communications.

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 - TCF CONTROL WIRING DIAGRAMS

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