Rockwell Automation 1606-XLDC92D Power Supply Reference Manual - Manual (Page 18)

All parameters are specified at 24V, 3.8A, 24Vdc input voltage, 25°C ambient and after a 5 minutes run-in time, unless noted otherwise.
18 Rockwell Automation Publication 1606-RM023A-EN-P — January 2014
Bulletin 1606 Switched Mode Power Supplies
21.4. External Input Protection
The unit is tested and approved for branch circuits up to 50A. An external protection is only required, if the supplying
branch has an ampacity greater than this. Check also local codes and local requirements. In some countries local
regulations might apply.
If an external fuse is necessary or utilized, minimum requirements need to be considered to avoid nuisance tripping of
the circuit breaker. A minimum value of 10A B- or 8A C-Characteristic breaker should be used.
21.5. Requirements for the Supplying Source
In certain circumstances, the input filter of the DC/DC converter can show a resonant effect which is caused by the
supplying network. Especially when additional external input filters are utilized, a superimposed AC voltage can be
generated on the input terminals of the DC/DC converter which might cause a malfunction of the unit. Therefore,
additional input filters are not recommended. To avoid the resonant effects, the minimal resistance of the supplying
network which depends on the inductance of the input network, shall be above the boundary curve in Fig. 21-3.
Fig. 21-3 External input filter requirements to
avoid filter instabilities
1 mOhm
10 mOhm
0.1mH 1mH 10mH
100 mOhm
1 Ohm
Resistance of the
supplying network
(a) max.
(b) typ.
Inductance of the supplying network
(a)
(b)
21.6. Parallel Use to Increase Output Power
This DC/DC-converter is designed to meet the NEC Class 2 requirements. Do not use in parallel to increase the output
current. This would increase the output current and violate the NEC Class 2 limitations.
21.7. Parallel Use for Redundancy
This DC/DC-converter is designed to meet the NEC Class 2 requirements. Do not use in parallel for redundancy.
This would increase the output current and violate the NEC Class 2 limitations.