ABB UAC375AE103 3BHB006621R0103 Logic sequence module

The DMC-18x2 also provides an amplifier enable signal, AEN. This signal is deactivated under the following conditions: the watchdog timer activates, the motor-off command, MO, is given, or the OE1command (Enable Off-On-Error) is given and the position error exceeds the error limit. As shown in Figure 3-1, AEN can be used to disable the amplifier for these conditions. The standard configuration of the AEN signal is TTL active high. In this configuration the AEN signal will be high when the controller expects the amplifier to be enabled. The polarity and the amplitude can be changed if you are using the ICM-2900 interface board. To change the polarity from active high (5 volts= enable, zero volts = disable) to active low (zero volts = enable, 5 volts= disable), replace the 7407 IC with a 7406. Note that many amplifiers designate the enable input as ‘inhibit’.

To change the voltage level of the AEN signal

 note the state of the resistor pack on the ICM/AMP1900 or ICM-2900. When Pin 1 is on the 5V mark, the output voltage is 0-5V. To change to 12 volts, pull the resistor pack and rotate it so that Pin 1 is on the 12 volt side. If you remove the resistor pack, the output signal is an open collector, allowing the user to connect an external supply with voltages up to 24V. To connect an external 24V supply, remove the resistor pack, RP1, from the interconnect board. Connect a 2.2kΩ resistor in series between the +24V of the supply and the amplifier enable terminal on the interconnect (AMPEN). Then wire the AMPEN to the enable pin on the amplifier. Connect the - 24V to the ground, GND, of the interconnect and connect the GND of the interconnect to the GND of the amplifier. 

NOTE

 Before connecting the GND of the interconnect, to the GND of the amplifier, check for continuity between the two points. If continuity exists, do not connect the two points. If continuity does not exist, then you must connect the points to create a reference for the motor command signal.

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