User`s manual

CD Automation srl REVO S User’s Manual
CD-Eng-REVO-S-1PH-60-210A-Solid-State-Relay
15
7 Led status and Alarms
LED STATUS
DESCRIPTION
LED OFF Load OK
LED ON (Yellow) Load Fault (only with HB option)
H.B.
S.C.
LED ON (Red) SCR short circuit (only with HB option)
LED OFF Load is NOT powered
ON
LED ON (Green) Load is powered
8 Heater Break alarm and SCR short circuit (HB Option only)
Caution: to work properly the load must be powered at least about 160msec.
The Heater Break circuit read the load current with an Internal current transformer (C.T.).
Minimum current is 10% of the current transformer size.
If load current is below this value the Heater Break Alarm doesn’t work properly.
Heater break Calibration procedure
An automatic function sets the Heater Break Alarm.
The auto setting function can be activated using the “CAL” button on front unit, or supply with 12-24Vdc
the digital input "Cal Ext." (See Connection Diagram).
The Heater Break calibration procedure is performed in this way:
• The Unit gives the maximum voltage output
• all LEDS are on, this means that calibration procedure is active
• The current value is stored in memory
• After about 15 second the unit comes back to the initial situation
If load current decreases for partial or total load failure (sensitivity 20%) the yellow LED HB become ON
and alarm relay change status.
If the unit is still in conduction with no input signal (LED green OFF) it means that there is a short circuit
on thyristors and red LED (SC) become ON.
If the load has been changed the Heater Break calibration procedure must be done again
ON
S.C.
H.B.