Com Port; Figure 5-4. Isolation Transformer Connection (Eliminates Torque Disturbance) - Aerotech BA-SineDrive Series User Manual

Technical Details
Second, another problem that potentially exists with off line connections is 50/60 Hz
electrostatic coupling between the frame of the AC motor and the HI/LO AC input
power. Since LO is referenced to earth ground back at the source, the DC bus of the
amplifier "swings" at 50/60 Hz with respect to the motor frame.
The path of current caused by this coupling between the motor frame and the amplifier
stage passes through the current feedback sensing devices of the amplifier. Depending on
the magnitude of this current, a 50/60 Hz torque disturbance may be present in the
position loop.
To eliminate this problem, an isolation transformer can be used to block the 50/60 Hz
from being seen by the motor frame. Refer to Figure 5-4 for connection of this
transformer.
This configuration is especially important if the BAS amplifier is operating at DC bus voltages of 160 VDC or 320 VDC
(e.g., 115 VAC or 230 VAC input power).

5.2.2. COM Port

The COM port is a standard 9-pin "D" style connector located on the front of the BAS,
refer to Figure 5-1. It consists of two signal lines; transmit (TXD) and receive (RXD), a
ground, shield, and a 5V power supply line used to power the Aerotech Hand held
Terminal (HHT). Table 5-1 contains the connector pinouts. The BAS is configured as
Data Terminal Equipment (DTE), therefore, a NULL MODEM cable is required to
connect to the PC. This swaps pins 2 and 3 for proper communication.
Table 5-1.
5-4
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BAS
AMPLIFIER
LO
HI
FRAME GND.
A
B
C
Grounding Screw

Figure 5-4. Isolation Transformer Connection (eliminates torque disturbance)

COM Port Pinouts
Pins
1
2
3
4,6,7,8
5
9
Aerotech, Inc.
BA SineDrive User's Manual
10A slow blow - BAS10
20A slow blow - BAS20
30A slow blow - BAS30
Torque
to 5 - 7 in-lb
Use 60 degree C copper conductors only
Earth Ground
Function
Shield
Receive (RXD)
Transmit (TXD)
NC
Ground (GND)
+5 V
115/230 VAC
50/60 Hz
Version 1.4