15 SM01P
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 (2-wire), 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
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, SCL/SCM 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 120kΩ.
4-20 mA Wire the positive to terminal TB-25 and the negative to terminal TB-2.
TB-25 input impedance is 250Ω.
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