Axis 7100 Service Manual download pdf (Page 35)

III Control inputs and outputs

III.1 Input functions

III.1.1 Analog inputs

Setpoint input SW

The servo amplifier is equipped with a decoupled differential input for an analog setpoint.

It is set for a differential input voltage of max. ± 10 V, resolution 1mV.

Ground reference: AGND, terminal X3/17.

A positive voltage on terminal X3/1 with regard to terminal X3/2 produces a clockwise rotation of

the motor shaft (looking at the shaft). The common-mode voltage range (important to avoid

earth loops) amounts to an additional ± 10 V, input resistance: 20 kΩ.

III.1.2 Digital control inputs

All inputs are isolated and coupled via optocouplers. The ground reference is Digital-GND

(DGND, terminal X3/12). The logic is designed for +24V/7mA (PLC compatible), logic-high

level is +12 ... 30V / 7mA.

Enable input E

The output stage of the amplifier is enabled by the Enable signal (terminal X3/16, input 24V,

(active high). The attached motor is torque-free in the disabled state.

STOP / NSTOP (limit switch) inputs

Limit switch positive/negative (PSTOP / NSTOP, terminals X3/10 and 11), high level in

normal operation (fail-safe for cable break). A low signal (open) disables the corresponding

direction of rotation, the ramp function remains active.

If the inputs are blocked the I-component of the speed controller will also become ineffective,

so that a mechanical demarcation (dead stop) is permissible.

This function must be explicitly enabled (parameter LIMIT SWITCH to ON).

If the parameter LIMIT SWITCH is set to STOP, the result is a controlled drift-free standstill of

the motor, with the standstill torque M

, when the limit switch inputs are disabled (I-component

is active).

Programmable input

I/0

Terminal X3/15 (I/O) can be programmed by means of the I/O parameter for the following input

functions (see Chapter II.2.2 or II.2.4 for a wiring example) :

— RESET : hardware reset of the servo amplifier (active high)

— 1:1 CONTROL : servo amplifier operates purely as a current controller (active high)

— INT. OFF : switches offf the I-component of the speed controller (active high)

Ground reference : DGND (terminal X3/12)

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Chapter III Control inputs and outputs Page III - 1

digifas™ 7100 series 01.98

Warning !

Do not program terminal X3/15 as an output if it is wired up as an input !

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Axis 7100 Service Manual Page 35