Rockwell Automation Publication 1606-RM028A-EN-P - September 2021
9
DC-OK Relay Contact
This feature monitors the output voltage that the power supply unit produces.
It is independent of any back-fed voltage from a unit that is connected in
parallel to the power supply unit output.
Shutdown Input
This feature allows a switch-off of the output of the power supply unit with a
signal switch or an external voltage. The shutdown occurs immediately, while
the turn-on is delayed up to 350 ms. In a shut-down condition, the output
voltage is <4V and the output power is <0.5 W.
The voltage between different minus pole output terminals must be below 1V
when units are connected in parallel. In a series operation of multiple power
supply units, only wiring option A with individual signal switches is allowed.
Action
Notes
Contact closes
Once the output voltage reaches 90% of the adjusted output voltage
Contact opens
Once the output voltage dips more than 10% below the adjusted output voltage. Short dips are extended
to a signal length of 250 ms. Dips shorter than 1 ms are ignored.
Contact recloses
Once the output voltage exceeds 90% of the adjusted voltage
Contact ratings
Max
60V DC at 0.3 A, 30V DC at 1 A, 30V AC at 0.5 A
Resistive load
Min
1 mA at 5V DC
Min permissible load
Isolation voltage
Dielectric Strength on page 16
Figure 17 - DC-OK Relay Contact Behavior
g
y
250 ms
0.9* V
ADJ
1 ms
<
10%
open
=
OUT
V
V
ADJ
open
closed
closed
>
1 ms
IMPORTANT
Option C requires a current sink capability of the voltage source. Do not
use a blocking diode.
The shut-down function has no safety feature included.
Figure 18 - Activation of the Shut-down Input
g
15
16
OFF: linked
ON : open
Shut-
down
Input
Option A:
15
16
OFF: I > 0.3 mA
ON : I < 0.1 mA
Shut-
down
Input
Option B:
-
(via open
collector)
NC
I
15
16
OFF: U < 1V
ON : U = 4…29V
Shut-
down
Input
Option C:
-
(via external
voltage
+
U
NC
