Rockwell Automation 1771-OD AC (120V) Isolated Output Module Installation Instructions - Manual (Page 4)

AC (120V) Isolated Output Module 4
Publication 1771-IN078A-EN-P - October 2002
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.
ATTENTION
!
When using a remote I/O system with a PLC
processor, use only the 1771-AS or 1771-AR
remote I/O adapter module which is series B or
later. These remote I/O adapters add additional
capability for shorted data bus detection. Failure
to use series B or later remote I/O adapters may
result in damage to equipment and/or personal
injury.
Surge suppression circuitry is provided for the output of the 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.
Loads with inductive characteristics may require additional
suppression devices. The impedance characteristic of the load is the
most important factor in selecting a suppression device; thus no
single suppression device can be recommended for every possible
load. See table a for acceptable suppression devices for typical loads.
Table A
AllenĆBradley Suppressors
AllenĆBradley Equipment Suppressor Catalog Number
Motor Starter Bulletin 509 599-K04 1
Motor Starter Bulletin 709 1401-N10 1
Relay Bulletin 700 Type N or P 700-N5/700N9 3
Miscellaneous 700-N24 4
1 For starters with 120V ac coils
2 Maximum coil voltage 150V ac or dc
3 Bulletin 77-N24is a universal surge suppressor. You can use it on electromagnetic
devices with limitation of 35 sealed VA, 150V.
Pre-installation
Considerations
Suppression