Nordcap 406600891, Service Manual

Page: 56 / 76

56
LIBERO LINE HOB INDUCTION
4.7.3.5 S4, COOKING TOP COUPLING
This test is made to check the quality of the coupling between pots and generator, the function is more useful
on HOB appliances.
Fry tops do not need to do this test this because the cooking surface is already coupled with the generators
and the quality of the bonding is guaranteed by the materials of the cooking top that is built on the appliance.
Execute Service Utility S4: Power supply v pot coupling rate.
During this test one pot must be present on one cooking zone (do not use empty pots as the appliance will
carry out a real functions test / fill them with water).
The test involves one cooking zone only. If pots are detected in more than one cooking zones at the same
time the test is performed in one zone only, randomly chosen. There is no indication on the UI of the cooking
zone used for the test.
NOTE 2: With single zone HOB, where two concentric coils are in use, the coupling factor is calculated:
If pot is detected only on the inner coil (small pot)
→
The coupling factor is calculated taking into account only
the power generated/requested on the inner coil.
If pot is detected on both inner + outer coils (large pot)
→
The coupling factor is calculated summing the power
generated/requested on both coils.
A quick explanation of how this test works.
The test is done in three steps:
•
Step 1: The POW measures the main power supply voltage without load (zero power request).
•
Step 2: The maximum power (equivalent to level 10) is requested to the cooking area under test. Real
generated power is estimated measuring the current on the coil and a coupling factor is showed as:
Coupling factor % = (Estimated power / Requested power) %
Visualization is done as P
x :
P0
→
0% to 9% P5
→
50% to 59%
P1
→
10% to 19% P6
→
60% to 69%
P2
→
20% to 29% P7
→
70% to 79%
P3
→
30% to 39% P8
→
80% to 89%
P4
→
40% to 49% P9
→
90% to 100%
•
Step 3: Main power supply voltage is measured with the cooking zone under test at max power.
Refer also to § PERFORMANCE .
NOTE !
- The test works only with Tesla single-phase, generator , 3500W. With Foucault HC the test ap-
parently works gives wrong values.
- With SZ HOB, Tesla generator 3500W, where two concentric coils are in use (explained at §
COILS & TEMPERATURE SENSORS, FOR SZ & DZ ), the coupling factor is calculated:
If pot is detected only on the inner coil (small pot)
→
The coupling factor is calculated taking into
account only the power generated / requested on the inner coil.
If pot is detected on both inner + outer coils (large pot)
→
The coupling factor is calculated summing
the power generated / requested on both coils.