Wolf MWD24-2 Service Manual page 32

Theory of Operation
Pin No. Signal I/O
47 P05 OUT
48-52 P04-P00 OUT
53 P57 OUT
54 P56 IN
55 TXD1 IN
56 RXD1 IN
57 P53 IN
#813632 - Revision B - December, 2009
Drawer Microwave
Description
Magnetron High-Voltage Circuit Driving Signal: To turn on and off cook relay
(RY2), in 100% power operation, the signals holds "H" level during microwave cook-
ing and "L" level while not cooking. In other cooking modes (90%, 80%, 70%, 60%,
50%, 40%, 30%, 20%, 10%, 0%) the signal turns to "H" level and "L" level in repeti-
tion according to power level.
Vari Mode
100% power
90% power
80% power
70% power
60% power
50% power
40% power
30% power
20% power
10% power
0% power
Used for initial balancing of the bridge circuit (absolute humidity sensor).
Common Relay Driving Signal
(Square Waveform : 60Hz): To turn
on and off the shut-off relays (RY1).
The square waveform voltage is deliv-
ered to the relay (RY1) driving circuit.
Terminal not used.
Terminal not used.
Terminal not used.
Terminal not used.
(Models MWD24-2 / MWD30-2)
Microwave Cooking Mode
On Time Off Time
32 sec. 0 sec.
30 sec. 2 sec.
26 sec. 6 sec.
24 sec. 8 sec.
22 sec. 10 sec.
18 sec. 14 sec.
16 sec. 16 sec.
12 sec. 20 sec.
8 sec. 24 sec.
6 sec. 26 sec.
0 sec. 32 sec.
3-20
Other Cooking Mode
On Time Off Time
60 sec. 0 sec.
54 sec. 6 sec.
48 sec. 12 sec.
42 sec. 18 sec.
36 sec. 24 sec.
30 sec. 30 sec.
24 sec. 36 sec.
18 sec. 42 sec.
12 sec. 48 sec.
4 sec. 56 sec.
0 sec. 60 sec.
16.7 msec.
During cooking
H: +5V
L: GND