Npaq MR Hardware Manual
Installation and Configuration
2.2.2. Minimizing Conducted, Radiated, and System Noise
To reduce electrical noise, observe the following wiring techniques.
1. Use shielded cable to carry the motor current and tie the shield to earth ground.
2. Use a cable with sufficient insulation. This will reduce the capacitive coupling between the leads that,
in turn, reduces the current generated in the shield wire.
3. Motor cables must be physically separated from low level cables carrying FireWire, encoder, and I/O
signals.
4. User connections to the product must be made using shielded cables with metal D-style connectors
and back shells. The shield of the cables must be connected to the metal back shell in order for the
product to conform to the radiated emission standards.
5. The Npaq MR is a component designed to be integrated with other electronics. EMC testing must be
conducted on the final product configuration.
The Npaq MR can generate conducted (AC line) and radiated noise when configured with MP drives.
Minimize conducted emissions by using line filters. A line filter should be located as close to the drive as
possible for maximum effectiveness. Aerotech recommends Schaffner FN2080-10-06 (Aerotech
P/N: ECZ01449) or Aerotech's UFM-ST product (refer to
).
Table 2-3:
UFM-ST Electrical Specifications
Specification
Value
Input Voltage Range
0-240 VAC
Output Voltage Range
0-240 VAC
Maximum Continuous Current
8 A
rms
with convection cooling
10 A
rms
with forced air cooling
Frequency
50/60 Hz
Phases
Single Phase
Leakage Current
1.1 mA (max)
Fuse Protection
Internal 10 A fuses on AC1 and AC2 inputs
TO MAINS
TO DRIVE
AC1
AC2
TB1-1
F2
F1
Q
VR
2
V2
0
E3
8
5
P
JP4
Q
VR
1
V2
0
E3
8
5
P
JP3
10 ASB 3AG
LINE
INTERNAL FILTER
COMPONENTS
LOAD
10 ASB 3AG
TB1-2
GND TB1-3
GND
TB2-3
AC1
AC2
TB2-1
TB2-2
Figure 2-3:
AC Line Filter (UFM-ST)
16
Chapter 2
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