AC Tech SM004S Installation And Operation Manual
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15 SM01P10 CONTROL WIRING10.1 Control Wiring vs. Power WiringExternal control wiring MUST be run in a separate conduit away from all other input andoutput power wiring If control wiring is not kept separate from power wiring, electrical noisemay be generated on the control wiring that will cause erratic drive behavior Use twistedwires or shielded cable grounded at the drive chassis ONLY Recommended control wireis Belden 8760 (2-wire), 8770 (3-wire), or equivalentNOTEControl terminals provide basic isolation (insulation per EN 61800-5-1) Protectionagainst contact can only be assured by additional measures e g supplementalinsulationStrip off 0 20 to 0 25 inches (5 to 6 mm) of insulation for control wiring, and torque thecontrol terminals to 2 lb-in (0 2 Nm) Be careful not to overtorque the control terminals, asthis will cause damage to the terminal strip This is not covered under warranty and canonly be repaired by replacing the control board10.2 TB-2: Circuit CommonThe TB-2 terminal is used as circuit common for the analog speed reference inputs Ifnecessary TB-2 may be connected to chassis ground10.3 Surge Suppression on RelaysCurrent 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 snubbercircuit should be used on coils associated with the drive For AC coils, snubbers shouldconsist of a resistor and a capacitor in series across the coil For DC coils, a free-wheelingor flyback diode should be placed across the coil Snubbers are typically available fromthe manufacturer of the device10.4 Start/Stop ControlThere are various control schemes that allow for 2-wire and 3-wire Start/Stop circuits Referto the wiring diagrams in Section 11, SCL/SCM CONTROL WIRING DIAGRAMS10.5 Speed Reference SignalsThe drive allows for three analog speed reference inputs:SPEED POT Connect the wiper of a speed pot to terminal TB-5, and connect the highand low end leads to terminals TB-6 and TB-2, respectively The speedpot can be 2 5kΩ up to 10kΩ0-10 VDC Wire the positive to terminal TB-5 and the negative to terminal TB-2 TB-5input impedance is 120kΩ4-20 mA Wire the positive to terminal TB-25 and the negative to terminal TB-2TB-25 input impedance is 250ΩPhone: 800.894.0412 - Fax: 888.723.4773 - Web: www.clrwtr.com - Email: info@clrwtr.com |
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