22
CD3000S
2PH from 10A to 90A
User’s manual
Heater break alarm and SCR short circuit
Only with HB option
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 is supplied with Heater Break (HB) alarm contacts 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:
7
Type
JP1
NO (standard)
A-B
NC
B-C
JP2
JP3
JP6
G1
K1
K2
G2
JP1
+
+
+
-
JP4
JP5
K1
K2
G2
JP1
A B C
35A-90A
Summary of Contents for CD3000S2PH
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