Allen-Bradley Series B User manual

AC (12-120V) Output Module
Cat. No. 1771-OAD Series B
Installation Instructions
This document provides information on:
important pre-installation considerations
power supply requirements
installing the module
using the indicators for troubleshooting
replacing the fuse
module specifications
The 1771-OAD Series B 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.
Your module receives its power through the 1771 I/O chassis backplane from
the chassis power supply. The module requires 295mA from the output of this
supply. Add this to the requirements of all other modules in the I/O chassis to
prevent overloading the chassis backplane and/or chassis power supply.
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.
Electrostatic Discharge Damage
ATTENTION: Under some conditions, electrostatic discharge
can degrade performance or damage the module. Observe the
following precautions to guard against electrostatic damage.
Wear an approved wrist strap grounding device, or touch a grounded
object to discharge yourself before handling the module.
Do not touch the backplane connector or connector pins.
To The Installer
Pre-installation Considerations
Power Requirements
Initial Handling

AC (12–120V) Output Module
Cat. No. 1771-OAD Series B
Installation Instructions
2
If you configure or replace internal components, do not touch other circuit
components inside the module. If available, use a static-free work station.
When not in use, keep the module in its static-shielded bag.
In this section we tell you how to:
change the mode of the fuse-blown jumper
key your I/O chassis
install your module
make your wiring connections
Changing the Mode of the Fuse-blown Jumper
The fuse-blown jumper has two modes:
the preset, standard (STD) mode – displays the fuse status on the red
fuse-blown status indicator
the customer side indication (CSI) mode – displays the fuse status in
the input image table and on the red fuse-blown status indicator. This
mode configures the module as a 16 point output module that utilizes
both the output and input image data tables of your controller.
When a fuse blows, all 16 bits in the associated input image table will
turn on (1).
For example, if you install the module in a PLC-5 system and address
the module as O:012, then the fuse status bits are in I:012.
To monitor the status of the module fuse, make certain that your user program
monitors the module’s input image table for ‘‘on” bits.
Important: Do not put the module jumper in CSI mode when you use
this module in a complementary mode. Your system will not operate
properly.
To change the fuse blown jumper to the CSI mode, do the following:
1. Locate the fuse-blown jumper at the top-right edge of the module
circuit board, as shown in the following figure.
2. Use your finger to slide the jumper off the STD position (the middle
post and the left post).
3. Carefully reposition the jumper by sliding it onto the CSI position (the
middle post and the right post).
STD CSI
Fuse Blown Jumper
(shown in preset
STD position)
Top-right edge of circuit board
12636-I
Installing Your Module

AC (12–120V) Output Module
Cat. No. 1771-OAD Series B
Installation Instructions
3
Keying Your I/O Chassis
Use the plastic keying bands, shipped with each I/O chassis, to key the I/O
slots to accept only this type of module.
The module circuit board is slotted in two places on the rear edge. The
position of the keying bands on the backplane connector must correspond to
these slots to allow insertion of the module. You can key any connector in an
I/O chassis to receive this module except for the left-most connector
reserved for adapter or processor modules. Place keying bands between the
following numbers labeled on the backplane connector:
Between 10 and 12
Between 20 and 22
You can change the position of these keys if system redesign and rewiring
makes insertion of a different module necessary.
Installing the Output Module
To install the ac output module in your 1771 I/O chassis, follow the steps
listed below.
ATTENTION: Remove power from the 1771 I/O chassis
backplane and field wiring arm before removing or installing an
I/O module.
Failure to remove power from the backplane or field wiring
arm could cause module damage, degradation of performance,
or injury.
Failure to remove power from the backplane could cause
injury or equipment damage due to possible unexpected
operation.
1. Turn off power to the I/O chassis.
2. Place the printed circuit board on the rear module in the plastic tracks
at the top and bottom of the slot that guide the module into position.
3. Do not force the module into its backplane connector. Apply firm, even
pressure on the module to seat it properly.
4. Snap the chassis latch over the top of the module to secure its position.
5. Connect the field wiring arm to the module.
6. Make wiring connections to the field wiring arm as indicated in Figure 1.

AC (12–120V) Output Module
Cat. No. 1771-OAD Series B
Installation Instructions
4
Connecting Wiring to the Output Module
Connections to the output module are made to the field wiring arm (cat. no.
1771-WH) shipped with the module. An optional fused field wiring arm is
available (cat. no. 1771-WHF) which provides individual fusing for each
circuit. Attach the field wiring arm to the pivot bar on the bottom of the I/O
chassis. The field wiring arm pivots upward and connects with the module
so you can install or remove the module without disconnecting the wires.
Refer to Figure 1. You must supply ac (L1) at terminals A through D on the
field wiring arm. You need four ac connections to accommodate the total
required surge rating on the module without overstressing any single
connection on the field wiring arm. Jumper all ac (L1) connections together
to prevent module damage.
Figure 1
Connection Diagram
L1
L1
L1
L1
(Actual wiring runs in this direction.)
L2/optional
L1
ac High
ac Low
Output 00
Output 01
Output 02
Output 03
Output 04
Output 05
Output 06
Output 07
Output 10
Output 11
Output 12
Output 13
Output 14
Output 15
Output 16
Output 17
L2
Output
Device
A
B
C
D
00
01
02
03
04
05
06
07
10
11
12
13
14
15
16
17
E
12223–I
Field WiringArm
Cat. No. 1771-WH

AC (12–120V) Output Module
Cat. No. 1771-OAD Series B
Installation Instructions
5
Important: You can use an AC (120V) Output Module (cat. no.
1771-OAD) to directly drive terminals on an AC/DC (120V) Input Module
(cat. no. 1771-IAD) (Figure 2).
Figure 2
Driving an Input Module with an Output Module
L1
120V ac High
L2
ac Low
(Cat. No. 1771-IA)
L2
ac Low
2500 ohm 10W
resistor
L1
ac/dc (120V)
Input Module
ac (12-120V)
Output Module
(Cat. No. 1771-OAD)
L1
120V ac High
ac (12-120V)
Output Module
(Cat. No. 1771-OAD) (Cat. No. 1771-IAD)
ac/dc (120V)
Input Module
12224–I
You can also use a 1771-OAD Output module to drive an AC/DC (120V)
Input Module (cat. no. 1771-IA) but you must connect one of the following
between the output terminal and L2 (common) as shown in Figure 2.
2500 ohm, 10W resistor
RG-1676-1 Electrocube (San Gabriel, California)
Use the same ac power source to power both modules to ensure proper
phasing and prevent module damage.

AC (12–120V) Output Module
Cat. No. 1771-OAD Series B
Installation Instructions
6
The front panel has one green module active indicator, 16 red status
indicators, and one red fuse-blown indicator (Figure 3).
The green module active indicator lights when:
the rack power supply has properly established 5V dc, and
the processor is placed in run mode
When the module is in the CSI mode, the green module active indicator
lights only when the rack power supply has properly established 5V dc.
To properly interpret the red status indicators, the module active indicator
must be lit.
The status indicators are provided for system logic side indication of
individual outputs. When a status indicator lights, voltage is present at the
output terminal.
The fuse-blown indicator lights when the fuse has blown or been cleared.
Figure 3
Status Indicators
ACTIVE
00
01
02
03
04
05
06
07
10
11
12
13
14
15
16
17
Module Active Indicator (green)
00 to 17 Status Indicators (red)
FUSE Fuse Blown Indicator (red)
12225–I
The module’s output circuitry is protected from overload or shorts by a fuse.
You can replace the fuse as outlined below.
1. Turn off all power to the I/O chassis and all output device power to the
field wiring arm.
ATTENTION: Remove power from the 1771 I/O chassis
backplane and wiring arm before removing or installing the module.
Failure to remove power from the backplane or field wiring
arm could cause module damage, degradation of performance,
or injury.
Failure to remove power from the backplane could cause
injury or equipment damage due to possible unexpected
operation.
Interpreting the Status
Indicators
Replacing the Fuse

AC (12–120V) Output Module
Cat. No. 1771-OAD Series B
Installation Instructions
7
2. Remove the module from the chassis and replace the blown fuse with a
10A, 250V rectifier fuse (1/4 x 1-1/4 inch), Littelfuse part number
322010.
3. Replace the module in the chassis and attach the field wiring arm.
4. Turn OFF all outputs to the module.
5. Turn ON power to the I/O chassis only.
6. Check that the red status indicators on the front of the module
(Figure 3) are off (no outputs on).
7. Turn on output device power to the field wiring arm.
8. Start with bit 00 and turn on individual outputs one at a time. Turn off
the previous output before turning on the next output.
9. If the red fuse blown indicator turns on, note which output is faulty and
trace the output wiring to the faulty device.
After correcting the fault problem, return to step 1 and begin again. If you
cannot locate a faulty output, return to step 8 and turn on 2 or more outputs
at the same time. Total output current should not exceed 2A per output, or
8A total per module.
Use this table to help you interpret the 1771-OAD status indicators and to
troubleshoot module and system faults.
Indicator Status Description of Fault or System Status Action to Take
Module active ON (green) Normal Indication. None.
Module active ON (green) and
Output status ON (red) Check voltage at output point on swing arm. If voltage is present, take no action. If no voltage is present, check the fuse. If the fuse
is OK, replace the module.
Module active ON (green) and
Output status OFF No voltage. None.
Voltage on terminal. Replace the module.
Module active OFF and
Output status ON (red) or OFF 1. Processor is in program mode.
2. Module not functioning properly.
1. If module is in normal mode, take no
action. If module is in CSI mode replace
module.
2. Check the chassis power supply and
processor. If they are OK, replace the
module.
Fuse blown (red) Outputs will not turn on. Replace the fuse. If fuse replacement does
not correct the problem, replace the module.
Troubleshooting

Specifications
AC (12–120V) Output Module
Cat. No. 1771-OAD Series B
Installation Instructions
8
Outputs per Module 16
Module Location 1771-A1B through -A4B or later I/O chassis, 1771-AM1, -AM2 chassis
Output Voltage Range 10 to 138V ac @ 47 - 63Hz
Output Current Rating 2A per output – not to exceed 8A per module
Surge Current (maximum) 25A per output for 100ms, repeatable every 1 second
25A per module for 100ms, repeatable every 1 second
Minimum Load Current 5mA per output
On State Voltage Drop (max.) 1.5V at load current > 50mA
5.8V at load current < 50mA
Off State Leakage Current (max.) 3.0mA per output @ 138V ac
Signal Delay (max.) Off to On
On to Off Zero crossing 8.3ms @ 60Hz, 10.0ms @ 50Hz Zero crossing 8.3ms @ 60Hz, 10.0ms @ 50Hz
Power Dissipation 13 Watts (max.), 1.5 Watts (min.)
Thermal Dissipation 48.0 BTU/hr (max.), 5.13 BTU/hr (min.)
Backplane Current 295mA
Isolation Voltage Tested at 2500V dc for 1 second per UL508 & CSA C22.2 #142
Environmental Conditions
Operational Temperature
Storage Temperature
Relative Humidity
0oto 60oC (32oto 140oF)
–40oto 85oC (–40oto 185oF)
5 to 95% (without condensation)
Conductors Wire Size
Category
14 gauge stranded maximum
3/64 inch insulation maximum
11
Keying Between 10 and 12
Between 20 and 22
Fuse 10A, 250V rectifier fuse (1/4 x 1-1/4 inch), Littelfuse PN 322010
Field Wiring Arm Standard
Optional Catalog Number 1771-WH Catalog Number 1771-WHF (fused)
Wiring Arm Screw Torque 7-9 inch-pounds
Relay Compatibility 700–HC14A1 700–HC14A1–4 700–HT12AA1 700–HF32A1 700–HTM12RA1
700–HP32A1–4 700–HB32A1 700–CL110A1 700–R110A1 100–A09
100–A30 100–A18 700–RT10N100A1 700–CL220A1 700–C110A1
1
You use this conductor-category information for planning conductor routing as described in the system-level installation manual.
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Publication 1771-2.74 November 1993
Supersedes Publication 1771-2.74 April 1992
PN 9551 15-84
Copyright 1993 Allen-Bradley Company, Inc. Printed in USA