Rockwell Automation 1771-OAD AC(12-120V)Output Installation Instructions - Manual (Page 4)

AC (12-120V) Output Module 4
Publication 1771ĆIN024B-EN-P - November 2002
!
ATTENTION
Preventing Electrostatic Discharge
This equipment is sensitive to electrostatic
discharge, which can cause internal damage and
affect normal operation. Follow these guidelines
when you handle this equipment:
•
Touch a grounded object to discharge potential
static.
•
Wear an approved grounding wriststrap.
•
Do not touch connectors or pins on component
boards.
•
Do not touch circuit components inside the
equipment.
•
If available, use a static–safe workstation.
•
When not in use, keep modules in appropriate
static–safe packaging.
The 1771-OAD Series C module is compatible with all chassis
except 1771-A1, 1771-A2 and 1771-A4 chassis. Make sure no other
output module or single card block transfer module is placed in the
same module group when using 2-slot addressing. Any discrete input
module may be used within the same module group.
Using the 1771ĆOAD Series C Module with HalfĆwave Rectifying
Load Devices (single diode) and Indicator Lights
This module uses zero-crossing technology to allow turn-on when
the output voltage is less than a specified voltage (typically 40 to
50V). This greatly reduces the stress on contacts and other devices
that are sensitive to current surges.
•
When using this output module with a device that includes a
single diode in series with the load, place a shunt resistor (39K
ohm, 1W) across the load. This resistor allows proper output
operation.
The shunt resistor may cause LED indicators to glow when the
output is turned off. In this case, use an incandescent lamp in
place of the LED.
•
When using a full-wave rectified device, the device may not turn
off when the output is deenergized. Add a 2.5K ohm, 10W
resistor in parallel with the device to provide proper operation.
•
If 24V ac incandescent indicator lights appear dim when used
with the Series C module, place a 2.5K ohm, 10W resistor in
parallel with the indicator. This will restore full brightness.
PreĆinstallation
Considerations