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Installation Data
This document provides information on:
important pre–installation considerations
power supply requirements
initial handling procedures
installing the module
using the module indicators for troubleshooting
replacing the fuse
module specifications
An output from this module can drive an Allen–Bradley Size 5 motor
starter, provided its supply voltage does not drop below 105V ac. The
maximum load current the module can deliver is 2A per channel, not to
exceed 6A total per module.
The switching device in the output circuit is a triac. There is a small
leakage current in the off state due to both triac and capacitive
characteristics. The maximum leakage current per output is 5mA at
138V ac. Nominal leakage current is 1mA. The on–state voltage drop
across the output terminals is no more than 2.0V ac at 100mA.
The triac needs a minimum of 60mA load current to stay on. If your
device pulls less than 60mA, the triac will not operate. The total
continuous current the module supports is 6A (2A maximum per channel).
If this rating is exceeded, the module overheats and damage may occur.
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Summary of Contents for Allen-Bradley 1771-OD
- Page 1 Installation Data This document provides information on: important pre–installation considerations power supply requirements initial handling procedures installing the module using the module indicators for troubleshooting replacing the fuse module specifications An output from this module can drive an Allen–Bradley Size 5 motor starter, provided its supply voltage does not drop below 105V ac.
- Page 2 Surge suppression circuitry is provided for the output triacs of this module. To suppress high–voltage transients from the ac line, a metal–oxide varistor (MOV) is provided between each set of terminals on the module. In each output circuit, an RC network limits the magnitude of voltage transients that may occur when a device is wired in parallel or series with hard contacts.
- Page 3 The ac output module is shipped in a static–shielded bag to guard against electrostatic discharge damage. Observe the following precautions when handling the module. ATTENTION: Remove power from the 1771 I/O chassis backplane and wiring arm before removing or installing an I/O module.
- Page 4 Use the plastic keying bands, shipped with each I/O chassis, to key your I/O slots to accept only this type of module. Place keying bands between these numbers labeled on the upper backplane connector: between 4 and 6 between 30 and 32 Slots on the rear edge of the circuit board are matched to these slots to allow insertion of the module.
- Page 5 ATTENTION: The field wiring arm terminal identification number is not the same as the number of the bit which controls that output. You should identify the labels on the wiring arm with the name or number of the device connected at each terminal. You can use an output of the 1771–OD module to drive an input of a 120V ac input module (1771–IA, –IA2, –ID, –IAD) to indicate status of turning on a motor starter, for example...
- Page 6 The module has 12 status indicators (Figure 3). The top 6 indicators show the state of each output and are driven by the logic circuitry on the programmable controller side of the module. These indicators light when their corresponding outputs are energized. The bottom 6 indicators display a blown–fuse condition at the respective output regardless of the state of the output.
- Page 7 Replacing a Fuse Each module output is individually fused. You can easily access the module fuses by removing the front component–side cover. ATTENTION: Remove power from the 1771 I/O chassis backplane and wiring arm before removing or installing an I/O module.
- Page 8 As a subsidiary of Rockwell International, one of the world’s largest technology companies — Allen-Bradley meets today’s challenges of industrial automation with over 85 years of practical plant-floor experience. More than 11,000 employees throughout the world design, manufacture and apply a wide range of control and automation products and supporting services to help our customers continuously improve quality, productivity and time to market.
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