18
PSD1206
- PSD1210
- SIL 3 - SIL 2 Switching Power Supply 24 Vdc
G.M. International ISM0076-7
Procedure
After “Crowbar A test”, continue setting the “overvoltage crowbar test jig” (TPF1210): SW1=OFF, SW2=ON, SW3=ON, SW4=OFF
Step
1
Turn on the PS by closing switch I1
2
3
At this point “Crowbar B” will trigger the shortcircuit and output voltage (V1) will be < 2 V. Maximum voltage (V1)
obtained just before the crowbar’s trigger point should be between 27.0 V and 29.0 V
4
Turn off the PS immediately by opening the supply switch (I1) so that the “crowbar” is reset
5
Crowbar B operation:
Connect the power supply as shown in the following image
Output voltage value (V1) should be greater than 24 V nominal at 80% of full load. Now, after checking this condition,
rotate potentiometer (P1)
counter-clockwise
slowly to decrease its resistance and observe that the corresponding output voltage
(V1) increases simultaneously while rotating.
MODELS PSD1210 - PSD1206
Rotate potentiometer (P1)
clockwise
completely to obtain maximum resistance
6
+
-
CS
Sharing
current
+
+
-
-
I1
=
_
PR
+
A1
V1
+
L/+
N/-
220 Vac
4321
ON
OFF
+
-
Vout adjust
D
iode test
TPF1210
C2
C1
B2
B1
A2
A1
D2
D1
S2
COM
S1
