Setting The Current Limit; Pre-Amplifier Gain Characteristics; The Post-Amplifier - Aerotech DR500 Operation & Technical Manual

Set Up
2.2.5.4.
The RCN4 resistor component 8-9 is used to set the maximum current that can be
obtained by the current limit potentiometer (full CW for zero current, full CCW for
maximum current). In torque mode (default), this potentiometer should be full CCW, so
the controller may limit the peak current by its parameters.
2.2.5.5.
The open loop transfer function for the input connection Vcom (pin 16, J1) and tach
feedback connection Vfb (pin 18, J1) to internal current command signal, Icom, is shown
in Figure 2-7. The gain curves shown in Figure 2-7 are in relation to the values of RCN4
shown in Figure 2-6.
2.2.5.6.
A detailed circuit description of the post-amplifier (shown by dotted lines in Figure 2-5)
is outlined in Figure 2-9. The circuitry shown in Figure 2-9 is for reference only and is not
intended to be altered by the user.
Figure 2-9 shows the control relationships of the internal current command, Icom, with
the internal current feedback signal, Ifb, (see also Figure 2-5 and Figure 2-6. A brief
outline of the PWM circuit, used to control the MOFSET switches of the output power
stage, is also shown in this figure.
2-16
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DR500 Operation and Technical Manual

Setting the Current Limit

Pre-Amplifier Gain Characteristics

The Post-Amplifier

Aerotech, Inc.
Version 16