Allen-Bradley 1771 OND, 1771 A1B, A4B, 1771 ASB, 1771, 1771, 1771 IND, IN, 1771 WH, 1771 WHF Installation Instructions

AC (24V) Output Module
Cat. No. 1771OND
Installation Instructions
To The Installer
This document provides information on:
important pre-installation considerations
power supply requirements
installing the module
setting the fault mode
using the indicators for troubleshooting
replacing the fuses
module specifications
Preinstallation
Considerations
This module must be used with a 1771-A1B thru -A4B or later I/O chassis.
If you are using a 1771-ASB remote I/O adapter you may use any
combination of I/O modules. Otherwise, make sure no other output module
or single card block transfer module is placed in the same I/O group.
Power Requirements
Your module receives its power through the 1771 I/O chassis backplane
from the chassis power supply. The module requires 700mA 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
backplane power supply.
Installation Instructions
AC (24V) Output Module
Cat. No. 1771-OND
Initial Handling
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.
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 a static-shielded bag.
Installing Your Module
In this section we tell you how to set the fault mode selection plug, key
your I/O chassis, install your module and make your wiring connections.
Fault Mode Selection
You may select one of two output-failure configurations (last state or reset)
by positioning a configuration plug on the bottom edge of the printed
circuit board. This configuration plug is independent of the last state
switch on the I/O chassis backplane.
To set the fault mode selection, proceed as follows:
1.
Locate the fault mode selection plug at the bottom edge of the module
circuit board (Figure 1).
Figure 1
Fault Mode Selection Plug
LS
Bottom edge of circuit board
2
RESET
Fault Mode Selection Plug
(shown in last state position)
10673-I
2.
Using your finger, slide the plug off the two posts.,
3.
Carefully position the plug on two of the three posts that correspond
to your requirement.
Installation Instructions
AC (24V) Output Module
Cat. No. 1771-OND
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 20 and 22
Between 32 and 34
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 wiring arm before removing or installing an I/O
module.
Failure to remove power from the backplane or 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 module in the plastic tracks on the top and bottom of the
slot that guides 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 wiring arm to the module.
6.
Make wiring connections to the field wiring arm as indicated in
Figure 2.
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Installation Instructions
AC (24V) Output Module
Cat. No. 1771-OND
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 wiring arm is
available (cat. no. 1771-WHF) which provides individual fusing for each
circuit. Attach the wiring arm to the pivot bar on the bottom of the I/O
chassis. The wiring arm pivots upward and connects with the module so
you can install or remove the module without disconnecting the wires.
You must supply ac (L1) at terminals A through D on the 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 2
Connection Diagram
L1
24V ac
Terminal A
Terminal B
Terminal C
Terminal D
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
Terminal E
A
B
C
D
00
01
02
03
04
05
06
07
10
11
12
13
14
15
16
17
E
(Actual wiring runs in this direction.)
4
Output
Device
L2
ac Low
10674I
Installation Instructions
AC (24V) Output Module
Cat. No. 1771-OND
Important: You can use an AC (24V) Output Module (cat. no.
1771-OND) to directly drive terminals on an AC (24V) Input Module (cat.
no. 1771-IND) (Figure 3). You can also use a 1771-OND Output module to
drive an AC (24V) Input Module (cat. no. 1771-IN) but you must connect
a 250 ohm, 5W resistor between the output terminal and L2 (common) as
shown in Figure 3. Use the same ac power source to power both
modules to ensure proper phasing and prevent module damage.
Figure 3
Driving an Input Module with an Output Module
AC (24V)
Input Module
(Cat. No. 1771IND)
AC (24V)
Output Module
(Cat. No. 1771OND)
AC (24V)
Output Module
(Cat. No. 1771OND)
AC (24V)
Input Module
(Cat. No. 1771IN)
L1
24V ac High
L1
24V ac High
250 ohm 5W
resistor
L2
L2
ac Low
Note: 1771OND output voltage
range is 1060V ac. However, the
onstate voltage range of the
1771IND is 1929V ac.
L2
ac Low
Note: 1771OND output voltage
range is 1060V ac. However, the
onstate voltage range of the
1771IN is 1228V ac.
10675I
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Installation Instructions
AC (24V) Output Module
Cat. No. 1771-OND
Interpreting the Status
Indicators
The front panel of your module contains one green, module active
indicator, and 16 red status indicators (Figure 4). The 1771-OND performs
diagnostics in a handshaking mode when first powered up. Upon
successful completion of the diagnostics, the green module active indicator
lights. It turns off if a fault occurs in the data paths or the opto-isolators.
The red status indicators are provided for system logic side indication of
individual inputs. When a red indicator lights, voltage is present on the
terminal. The module transfers this information to the backplane for the
processor to read.
Figure 4
Status Indicators
Module Active Indicator (green)
ACTIVE
00 10
01 11
02 12
03 13
04 14
05 15
06 16
07 17
00 to 17 Status Indicators (red)
10676I
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Installation Instructions
AC (24V) Output Module
Cat. No. 1771-OND
Replacing the Fuse
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.
Troubleshooting
2.
Pivot the wiring arm away from the module and remove the module
from the chassis.
3.
Replace the blown fuse with a 10A, 250V rectifier fuse (1/4 x 1-1/4
inch), Littelfuse part number 322010.
4.
Replace the module in the chassis and attach the field wiring arm.
If a problem occurs, follow the procedure listed below.
Modules with Internal Fuses Only
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.
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Installation Instructions
AC (24V) Output Module
Cat. No. 1771-OND
2.
Pivot the wiring arm away from the module and remove the module
from the chassis.
3.
Replace the blown fuse with a 10A, 250V rectifier fuse (1/4 x 1-1/4
inch), Littelfuse part number 322010.
4.
Replace the module in the chassis and attach the field wiring arm.
5.
Turn OFF all outputs to the module.
6.
Turn ON power to the I/O chassis only.
7.
Check that the red status indicators on the front of the module
(Figure 4) are off (no outputs on). Make sure the red fuse blown
indicator is off.
8.
Turn on output device power to the field wiring arm.
9.
Start with bit 00 and turn on individual outputs one at a time. Turn off
the previous output before turning on the next output.
10. 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 9 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.
Modules with External Fuses Only
8
1.
Turn off all power to the I/O chassis and all output device power to
the field wiring arm.
2.
Pivot the wiring arm away from the module.
3.
Use a continuity checker (meter in low ohms setting) to check fuses
for an open (high resistance) reading.
4.
Note if fuse is open and trace the output wiring back to the output
device.
5.
Check the remaining fuses (refer to step 3).
6.
After all faulty fuses are replaced and any wiring problems solved,
reposition the wiring arm on the module.
7.
Turn off all outputs to the module.
8.
Turn on power to the I/O chassis.
Installation Instructions
AC (24V) Output Module
Cat. No. 1771-OND
9.
Check that the red status indicators on the front of the module are off
(no outputs on). Make sure the red fuse blown indicator is off.
10. Turn on output device power to the wiring arm.
11. Start with bit 00 and turn on individual outputs one at a time. Turn off
last output before turning on the next output.
12. If the red fuse blown indicator lights, 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 per module.
9
Installation Instructions
AC (24V) Output Module
Cat. No. 1771-OND
10
Installation Instructions
AC (24V) Output Module
Cat. No. 1771-OND
11
Installation Instructions
AC (24V) Output Module
Cat. No. 1771-OND
Specifications
16
Outputs per Module
Module Location
17711A1B thru A4B or later I/O chassis; 1771AM1, AM2
Output Voltage Range
10 to 60V ac @ 47 63Hz
Output Current Rating
2A per output not to exceed 8A per module
Surge Current (maximum)
Minimum Load Current
50mA per output @ 24V ac, 60Hz
On State Voltage Drop (max.)
Off State Leakage Current (max.)
Signal Delay
25A per output for 100ms, repeatable every 1 second
25A per module for 100ms, repeatable every 1 second
Off to On
On to Off
Power Dissipation
1.6V at 2A
3mA per output @ 24V ac
1.0ms;
8.3 to 9.1ms @ 60Hz
16.5 Watts (max.), 3.7 Watts (min.)
Thermal Dissipation
56.2 BTU/hr (max.), 12.6 BTU/hr (min.)
Backplane Current
700mA @ 5V dc +5%
Isolation Voltage
Tested at 1500V ac (rms) for 1s
Environmental Conditions
Operational Temperature
Storage Temperature
Relative Humidity
0o to 60oC (32o to 140oF)
40o to 85oC (40o to 185oF)
5 to 95% (without condensation)
Conductors
Wire Size
Category
Keying
Between 20 and 22
Between 32 and 34
Fuse
Field Wiring Arm
14 gauge stranded maximum
3/64 inch insulation maximum
11
10A, 250V rectifier fuse (1/4 x 11/4 inch), Littelfuse PN 322010
Standard
Optional
Wiring Arm Screw Torque
Catalog Number 1771WH
Catalog Number 1771WHF (fused)
79 inchpounds
1 Refer to publication 17704.1, Programmable Controller Wiring and Grounding Guidelines.
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12
Publication
17712.118 April 1994
Supersedes publication 17712.118 April 1990
P/N 95511219
Copyright 1994 AllenBradley Co. Inc. Printed in USA
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