Watlow Silver Series OIT - Manual (Page 7)

7 Watlow Silver Series OIT Installation Guide
0600-0069-0000 Rev D
Power Supply Selection
The power supply used to power the OIT should provide an output of
+24 VDC +/-20% measured at the OIT power terminal block. A 24VDC
regulated power supply dedicated to the OIT is recommended. Use a
power supply with adequate current rating based upon your particular
model.
A power line filter installed at the AC input to the OIT power supply is
highly recommended as a safeguard against conducted RF noise, which
is often present on factory power lines. The wires connecting the output
of the power line filter to the power supply should be kept as short as
possible to minimize any additional noise pickup. The case of the power
line filter should be connected to a quiet earth ground. The power line
filter should have a current rating of at least 3 Amps with common mode
and differential mode attenuation. In applications that may have high
frequency noise present, we also recommend using a resistor (~1 MΩ)
and capacitor (~4700 pF) in parallel to clean earth ground on the DC
output of the power supply.
Do not use the power supply used to provide power to the OIT to power
switching relays, solenoids, or other active devices.
Figure 3: Power Line Filter Connection
Cable Routing & Noise Immunity
Follow these guidelines when routing cables to the OIT:
- Always route the OIT communication cable and the power cable
away from any AC voltage or rapidly switching DC control lines.