Solidstaterelay (Ssr) Internal Design / Test - Rational SelfCookingCenter SCC Training Manual

SolidStateRelay (SSR) internal design / Test

http://bit.ly/SSR_testing
V08 en, SCC
A2
A+ A-
12V DC
B+ B-
B2
A1/B1
+
-
+
-
A1/B1
+
-
+
-
A1/B1
Contactor with 12V DC coil
Terminal A2 is connected to steam elements
Terminal B2 is connected to hot air elements.
Steam and hot air are never active at the same time.
All screw connections: Torx 20
SSR are normally failing in closed position
To check a SSR for correct operation:
Switch unit on
Open cabinet door
Voltage test: when line voltage (L1-L2) is meas-
ured SSR is ok.
Current test: when no current (below 1 amp) is
measured, SSR is ok.)
Close cabinet door.
Select hot air. When less than 1.5V is measured
across the SSR B1/B2 component is ok.
Select steam. When less than 1.5V is measured
across the SSR A1/A2 component is ok.
open cabinet door
A2
A
B
Volt
B2
400V = ok
A2
A
B
0 Amp = ok
B2
- 54 -
Volt
400V = ok