A4H124-24TX

Brand:FOXBORO

Type:A4H124-24TX

Origin: the United States

Warranty: 365 days

Colour: new/used

Shipping method: Courier delivery

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There can be substantial capacitance between the power wires and adjacent feedback shield in a composite cable. Some of the PWM ampere level spikes tend to return in this adjacent shield, affecting the power stage voltage and current drive the feedback shield nearest to the power wires. In a single-shielded feedback cable this driven shield is also around the feedback data wires, so some coupling can occur. With double, concentric feedback shields, the driven shield is the outer of the two feedback shields, and interposed between the driven shield and feedback data wires is the inner feedback shield. Typically, the inner feedback shield is isolated from the connector shells and is connected to the return for the power supply powering the feedback device. NOTE A raw cable with two pairs of twisted, shielded feedback sections inside a composite cable is electrically the same as single feedback shielding. There may physically be two feedback shields in such a cable, but these shields are not concentric. There is only one shield between the power and feedback wires. Whereas the double, concentric feedback shields have two shields between the power and feedback wires. 2) SFD +5 and Gnd Resistance Spec To insure that the SFD +5 V at the SFD inside the motor is within specification, the voltage drop total in the SFD +5 V wire and SFD +5 V RTN wire must not be greater than 0.5 V at 150 mA. For this reason, a cable requirement is that the total resistance of the feedback SFD +5 V wire plus SFD +5 V RTN wire must be<3.33 Ω (at 20° C). In practice, this means that for long cables, the AWG wire gage needs to be considered. NOTE The inner shield of the a double, concentric feedback cable, when isolated from the terminating connector shells, can also function as a conductor to carry some or all of the SFD +5 V RTN current. This is useful to keep the total SFD +5 and RTN resistance within specification on long cables without having large diameters. 3) Feedback Characteristic Impedance Danaher Motion's S200 feedback cables are designed to have a feedback data pair differential impedance of 81 Ω (at 1 MHz). Impedances in the range of 50 to 100 Ω, while not tested, will likely work properly with the S200. Two suggestions simplify the design of customer composite cable: 1. Purchase the raw composite cable from Danaher Motion. The cable has good shielding properties. 2. Purchase a composite feedback cable built by Danaher Motion. Review its construction, and test its performance. There are many ways to connect the multiple shields of a composite cable. A good way to understand how the Danaher Motion composite cable is built is to buy a short Danaher Motion S200 composite cable, open it up, and see how the shields at both the motor and drive end are connected.