REVO PC
User’s manual
45
Alarm description
8.1 Heater Break Alarm
This option allows you to diagnose any load breakage. The diagnostics is based on the comparison of the
value of the nominal resistance of the load with respect to the resistance measured in real time. The nominal
resistance is calculated using the
Operative Load Voltage
(
Load V
) and
Load Power
(
Load kW
) parameters.
Load kW / Load Voltage = Nominal I
Nominal Resistance R=Load V/Nominal I
The alarm threshold value is the value of the nominal resistance increased by the percentage defined by the
HB Sense parameter (menu System, see paragraph 7.2.2).
Example:
Resistance 2200W @ 220V
power/voltage= A --> 2200/220 = 10A
• Load V: 220 V
• nominal I: 10A
• Nominal resistance - R = 22 Ohm
HB sense parameter = 20% --> threshold value = 22 + (22 x 20 / 100) = 22+4,4 Ohm = 26,4 Ohm
22: R (V/I)
HB sense (+20%)
26,4
NO ALARM
30
25
20
15
10
5
0
Ohm
ALARM
No HB delay
22: R (V/I)
HB sense (+20%)
26,4
30
25
20
15
10
5
0
Ohm
8
The alarm activates when the detected Runtime resistance exceeds the value of 26.4 Ohm. (see paragraph
7.2.1)
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