Alarm Description; Heater Break Alarm - CD Automation REVEX 3PH RX3 120 Series User Manual

REVEX
3PH from 120A to 210A
12

Alarm description

12.1 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 (Nom Line V) and Nominal Current of the load
(Nominal I) parameters.
Nominal Resistance R=Nom Line V/Nominal I
The alarm threshold value is the value of the nominal resistance increased by the percentage defined by the
HB Sense parameter
Example:
Resistance 2200W @ 220V
power/voltage= A --> 2200/220 = 10A
• nominal 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
30
HB sense (+20%)
25
26,4
22: R (V/I)
20
15
10
Ohm
5
0
The alarm activates when the detected Runtime resistance exceeds the value of 26.4 Ohm.
No HB delay
30
HB sense (+20%)
25
26,4
22: R (V/I)
20
15
10
Ohm
5
0
Using the HB Delay parameter, the alarm intervention can be delayed.
HB delay (es: 2.5 sec.)
30
HB sense (+20%)
25
26,4
22: R (V/I)
20
15
10
Ohm
5
0
Sensitivity (HB sense) and delay (HB delay) can be varied according to the application (see parameters on
pages 33).
NO ALARM
ALARM
NO ALARM
52
HB delay (es: 2.5 sec.)
30
HB sense (+20%)
25
26,4
22: R (V/I)
20
15
10
Ohm
5
0
User's manual
ALARM