Product Code: 1VGL2-D24S01
40-channel alarm annunciator: two groups of 20 volt-free inputs, 24 V DC, four front keys. Designed and manufactured by Forte R&D.
Alarm Vigil was developed by Forte R&D for use inside GRIDFIX compensation panels. It gives visual and audible indication of panel fault conditions, so the fault is located without opening the cabinet.
Its inputs are wired to the fault outputs of the thyristor-switched stages, so each channel names the module or stage that tripped.
When a fault input closes, the channel LED lights and the audible alarm sounds. Maintenance can locate the fault before equipment is damaged.
High-visibility LED indicators show status at a glance. Colour-coded states (normal, warning, fault) can be read without a diagnostic tool.
The integrated audible alarm is heard in noisy industrial environments. Operators can acknowledge and silence it; the visual indicator stays on until the fault is cleared.
Designed to integrate directly into GRIDFIX compensation panels. Wiring, mounting, and signal connections are standardised for fast installation. Compatible with CSM100 thyristor module fault outputs.
Pinpointing the fault channel removes the time spent diagnosing which module has failed. With GRIDFIX hot-swap modules, the faulty stage is replaced without stopping the panel.
The forty inputs are labelled in two groups. The inputs are volt-free contacts — what you wire into them is up to you; the group names are printed on the front and rear labels.
One channel per switching module. The module’s own fault contact closes and the matching indicator lights — the operator reads a number, not a symptom.
One channel per detuned reactor. The thermal switch inside the winding closes long before the reactor is damaged, and the step can be shed before anything is lost.
There is no 1–40 sequence on the device — there are two sets of 1–20. Internally the hardware and firmware keep one flat sequence of forty (SWITCHING MODULE FAULT 1–20 are channels 1–20; REACTOR OVER HEAT 1–20 are channels 21–40), but that sequence is not marked on the device and is not used in wiring schedules. In a manual, a fieldbus register map or a terminal marking, only the group name and number may be used.
An alarm that has appeared stays on the front until an operator clears it — even if the fault itself has gone. A flashing indicator means nobody has acknowledged it yet. On this device MUTE and ACK are separate actions: one silences the horn, the other steadies the indicator.
| Everything normalno alarm present | Alarm appearsinput contact closes | Operator presses MUTEthe horn is silenced | Operator presses ACKthe alarm is acknowledged | Input clears + RESETthe record is cleared | |
|---|---|---|---|---|---|
| Indicator | off | flashing | still flashing | steady | off |
| Horn relay | RELEASED | PICKED UP | RELEASED | RELEASED | RELEASED |
| Common alarm relay | RELEASED | PICKED UP | PICKED UP | PICKED UP | RELEASED |
Steadies every flashing indicator. The horn is not affected — use MUTE for that.
Clears the record. A channel whose input is still active latches again at once, but comes back steady and does not sound the horn a second time.
Releases the horn relay. Indicators keep flashing and the common alarm relay is unchanged.
Lights every indicator while the key is held. Relay outputs are not affected.
MUTE silences the horn. ACK steadies the indicator. Neither does the other — this device needs both keys. On an acknowledged alarm the common alarm relay stays picked up, so an alarm that has been seen cannot be forgotten.
The values below are taken from the Rev A datasheet. The full datasheet can be downloaded from the button at the top of this page or in the Documents section below.
The Alarm Vigil is specified as part of the GRIDFIX passive compensation system.
Without an annunciator, finding a fault in a multi-stage compensation panel means opening the cabinet and checking each module in turn. With Alarm Vigil the fault channel is visible from outside the cabinet, and with GRIDFIX hot-swap modules the faulty stage is replaced without stopping the panel.
The layout below is the terminal side, as the rear label reads it. A terminal is identified the way it is marked on the device — group name and number.
| Terminal group | Poles | Marking | Function |
|---|---|---|---|
| SWITCHING MODULE FAULT | 20 | 1 … 20 | Alarm inputs, one pole each |
| REACTOR OVER HEAT | 20 | 1 … 20 | Alarm inputs, one pole each |
| 24 V DC | 2 | − + | Auxiliary supply |
| FAULT | 3 | C NC NO | Changeover — picks up while any alarm is latched |
| LAMP | 2 | C NO | Horn output — picks up on a new alarm, released by MUTE or RESET |
All forty inputs share one common return — the supply negative. Drive the contacts from this device’s own 24 V supply. Feeding them from a second supply would join two systems through that common return.
Service note. The connector references CN3…CN9 printed on the boards are for service only; they are not used in wiring schedules.
There are no variants, no options and no code segments to choose — the device is always supplied in the same configuration.
The serial number is on the side-wall label, in plain text and as a barcode. Quote it in any correspondence about a particular unit: the type code identifies the product, the serial number identifies the unit.
Supplied inside a GRIDFIX panel or as a standalone upgrade for an existing compensation panel.
Technical documents for this product. Ask for a document still in preparation and we will send it as soon as it is ready.
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