Rockwell Automation AADvance Controller Safety Manual - Manual (Page 71)

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Document: 553630
ICSTT-RM446K-EN-P Issue: 10
_C
4-15
Recommended Field Circuit for Digital Outputs
This circuit is suitable for simplex and dual configurations of digital output
modules. The two 10A fuses shown are included on the termination assembly
within the controller. The field power 5A fuses comply with UL508
requirements see illustration below.
The 10A fuses are fitted into the termination assembly and are:
 T9902: SMF Omni-Block, Surface Mount Fuse Block 154 010, with a 10A,
125V Fast Acting Fuse, Littlefuse.
 The field power input 5A fuses are:
 No 396/TE5 5A time lag fuse; UL 248-14, 125 V,T Leadfree; manufactured
by Littlefuse.
Note:
1. Alternatively instead of fitting two 5A fuses you can use Class 2 power
supplies for the +24V dc field voltage. Class 2 is defined by the NEC as
providing less than 100 watts (at 24V).
2. The field power must be wired using 12 AWG wire.
3. The field power must be supplied with an isolating source.
4. The minimum current required for line monitoring is 20mA for a dual pair.
For inductive loads, a back EMF protection diode shall be fitted at the
load.