Datasheet
PSR-PC20
106255_en_00 PHOENIX CONTACT 13
12 Proof test
In the proof test, you check the individual relay channels.
1. Activate A1/A2 (or A1'/A2).
2. Apply the 24VDC diagnosis power supply to con-
tact31 or the TBUS.
If the green DGN-LED lights up, the module is functional.
(Apply 24VDC to signal output M1.)
If the red ERR LED lights up, replace the module.
(Apply 0VDC to signal output M1. Error acknowledgment
via A1 is inactive.)
If the diagnostic voltage supply is present and the green
DGN LED and the red ERR LED are on, replace the module.
If the diagnostic voltage supply is present but neither of the
LEDs specified is on, replace the module.
13 Calculating the power dissipation
Input power dissipation
P
Input
=U
B
²
/(U
S
/I
S
)
Contact power dissipation
With the same load currents:
P
Contact
=nI
L
²
50mΩ
With different load currents:
P
Contact
=(I
L1
²
+I
L2
²
+...+I
Ln
²
)50mΩ
Total power dissipation
P
Total
=P
Input
+P
Contact
therefore
P
Total
=U
B
²
/(U
S
/I
S
)+nI
L
²
50mΩ
or
P
Total
=U
B
²
/(U
S
/I
S
)+(I
L1
²
+I
L2
²
+...+I
Ln
²
)50mΩ
Key:
Replace the device in the event of an error.
The total power dissipation of the safety relay
is based on the input power dissipation and
the contact power dissipation for the same
and for different load currents.
Designation Explanation
P Power dissipation in mW
U
B
Applied operating voltage
U
S
Rated control supply voltage
I
S
Rated control supply current
n Number of enabling current paths used
I
L
Contact load current