Reference Manual User guide

All parameters are specified at 48V, 5A, 230Vac, 25°C ambient and after a 5 minutes run-in time, unless noted otherwise.

Rockwell Automation Publication 1606-RM045A-EN-P — March 2014 9

Bulletin 1606 Switched Mode Power Supplies

7. Hold-up Time

AC 100V AC 120V AC 230V

Hold-up Time typ. 51ms 53ms 55ms at 48V, 2.5A, see Fig. 7-1

typ. 26ms 27ms 28ms at 48V, 5A, see Fig. 7-1

Fig. 7-1 Hold-up time vs. input voltage Fig. 7-2 Shut-down behavior, denitions

50ms

85 120 155 190 230Vac

Input Voltage

Hold-up Time

- 5%

Hold-up Time

Zero Transition

Output

Voltage

Input

Voltage

8. DC-OK Relay Contact

This feature monitors the output voltage, which is produced by the power supply itself. It is independent of a back-fed

voltage from a unit connected in parallel to the power supply output.

Contact closes As soon as the output voltage reaches the adjusted output voltage level.

Contact opens As soon as the output voltage dips more than 10% below the adjusted output voltage.

Short dips will be extended to a signal length of 250ms. Dips shorter than 1ms will be ignored.

Contact re-closes As soon as the output voltage exceeds 90% of the adjusted voltage.

Contact ratings max 60Vdc 0.3A, 30Vdc 1A, 30Vac 0.5A resistive load

min 1mA at 5Vdc min. permissible load

Isolation voltage See dielectric strength table in section 18.

Fig. 8-1 DC-ok relay contact behavior

250ms

0.9* V

ADJ

1ms

10%

OUT

= V

ADJ

1ms

open openclosed closed

Note: The DC-ok feature requires that the output voltage reaches the nominal (=adjusted) level after turn-on in order to function according

to specication. If this level cannot be achieved, the overload lamp will be on and the DC-ok contact will be open. The overload signal

will only shut off as soon as the adjusted voltage is reached. This is an important condition to consider particularly if the load is a

battery, if the power supply is used in parallel or if the power supply is used for N+1 redundant systems.