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Carlo Gavazzi Ltd.

RGC2, RGC3

RGC2, RGC3 DS ENG

05/10/20

RGC..M Mode of Operation

The RGC..M versions are suitable only for use with resistive loads.

The ‘M’ suffix versions integrate monitoring circuitry that can detect the status of the Mains, Load, and Solid State Relay

(SSR) status. The fault conditions that can be detected with the RGC..M include:

- Mains loss

- Load loss

- SSR open circuit

- SSR short circuit

- SSR over temperature

An external supply, 24 VDC or 90-250 VAC, selectable through part no. configuration, is required for the operation of the

RGC..M models. In the case of a fault condition, an EMR alarm output is available through terminals 11, 12, 14 for remote

indication. Alarm visual indication is provided by a flashing red LED. The flash rate of the red LED gives an indication of the

type of alarm condition detected.

The RGC..M is also equipped with an auxiliary output which operates in synchronisation with the output of the SSR. This

electronic auxiliary output with normally open or normally closed user selectable contacts is available through terminals 21,

22, 24. A yellow LED gives indication of the SSR output status.

Mains Loss:

The mains loss alarm is issued if the mains voltage is missing from either terminals L1, L2 or L3 for more than 1 second.

This alarm type is indicated by 2 flashes of the red LED. The alarm resets automatically once the mains voltage is restored

and is present on terminals L1, L2 and/or L3 for more than 1 second. In case of mains frequency outside the specified

limits, the mains loss alarm is activated. The SSR output is not affected in this condition; this means that if control is ON,

the SSR output remains ON.

Mains Supply (L1)

Mains Supply (L2)

Mains Supply (L3)

Load Current

Auxiliary Output, NO (21-24)

Auxiliary Output, NC (21-22)

Supply Voltage (Us)

Control Voltage (A1, A2)

Green LED (Control & Supply)

Yellow LED (Load status)

Red LED (Alarm)

Alarm Output, NO (11-14)

Alarm Output, NC (11-12)

Supply

Voltage (Us)

Loss

Normal

Opera�on

SSR OFF

Mains Loss

Detec�on, L1

(> 1 s)

Note 1

Note 1

Note 2

Note 2

Note 2

Note 2

Note 2

Note 2

Note 2

Note 2

Supply

Voltage (Us)

Loss

Normal

Opera�on

SSR ON

Mains Loss

Detec�on, L2

(> 1 s)

Mains Loss

Detec�on, L3

(> 1 s)

Mains Loss

Detec�on, L1, L2, L3

(> 1 s)

Normal

Opera�on

SSR ON

Note 1: For the AC external supply versions (RGC..A..A), the Auxiliary output, NC (21-22) will be closed only when the

external supply Us is present.

Note 2: Yellow LED and hence load current is OFF only if all phases L1, L2 and L3 are missing. If any 2 phases are present

and control voltage is applied, the yellow LED and auxiliary output will be ON.