Heater Break Alarm And Scr Short Circuit; Hb Alarm Contact (Only With The Hb Option) - CD Automation CD3000S1PH User Manual

CD3000S
1PH from 10A to 90A
7

Heater break alarm and SCR short circuit

The Heater Break circuit to work properly must have at least an input of 25% of the nominal
current.
H.B. circuit read load current via a current transformer 25-50/0.05 or 100/0.05 depending on thyristor size.
Minimum current is 30% of the current transformer size's. If load current is below this value make two turns or
more around current transformer. H.B. circuit also diagnoses fuse failure.

7.1 HB alarm contact (only with the HB option)

CD3000S up to 25A is supplied with Heater Break (HB) alarm contacts normally opened (NO) and normally
closed (NC), for the other sizes instead, the contact standard of alarm is normally opened (NO):
• In normal conditions (without alarm) and with auxiliary power supply, the contact to the terminals has opened
(relay coil energized).
• In alarm condition or without auxiliary power supply the contact to the terminals is closed (relay coil not
energized).
If you wish to change the alarm contact put the jumper as shown:
35A-45A
CN1
JP1
JP4 JP5
- +
+
CN2
JP1
C
B
A
K1
K2
G2
Type
NO (standard)
NC
22
60A-90A
G1
K1
K2
G2
-
JP1
A-B
B-C
User's manual
Only with HB option
JP5
JP4
+
A B C
JP1
+
JP3
JP2
JP6
JP1