Vighnaharta GDS-24-2 - User Manual

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Overview

Important Technical Specifications
GDS-24-2
GDS-24-4
Usage Features
System Programming
System Operation
Maintenance Features

The TrueSafe GDS-24-2/4 is a conventional gas detection panel designed for reliable gas detection, signaling, and protection in commercial, industrial, institutional buildings, or small offices. It is available in two variants: the GDS-24-2, which is a 24V operated panel with 2 input zones, and the GDS-24-4, a 24V operated panel with 4 input zones. The panel is cost-effective and compatible with most gas and heat detectors that provide potential-free outputs, continuously monitoring for trouble and gas conditions.

Important Technical Specifications:

GDS-24-2:

Power Supply: 180~264VAC, 47~63Hz
DC Output Voltage: 24~27 Volts DC, 1.2 A max
Battery Charging Voltage: 27 Volts DC nominal
Battery Charging Current: 200mA max
Battery Type: 2 x 12VDC, 1.2Ah Sealed Lead Acid Batteries
Number of Gas Detection Zones: 2
Available current for Gas Detectors: ~600 mA
Display: Large 16x2 character LCD Display
Sounder (Siren) output rating (one output): ~0.3 Amp
Relay contacts and ratings: Three Potential Free Relay Contacts - 1 Fire, 1 Valve Control, 1 Fault (2A Max contact ratings)
Keypad: 6 Keys
Operating Temperature: 0°C to 50°C
Humidity: 5 to 90% RH
Storage Temperature: -10°C to 70°C
Dimensions: 237mm x 217mm x 42mm (LxHxW)
Enclosure: Powder coated metal enclosure
Weight: 3 Kg approximately without batteries.

GDS-24-4:

Power Supply: 180~264VAC, 47~63Hz
DC Output Voltage: 24~27 Volts DC, 3A
Battery Charge Voltage: 27 Volts DC nominal
Battery Charging Current: ~700 mA
Battery Type: 2 x 12VDC, 7Ah Sealed Lead Acid Batteries
Number of Gas Detection Zones: 4
Available current for Gas Detectors: ~1.8 Amp
Display: Large 16x2 character LCD Display
Sounder (Siren) output rating (one output): ~0.3 Amp
Relay contacts and ratings: Three Potential Free Relay Contacts - 1 Fire, 1 Valve Control, 1 Fault (2A Max contact ratings)
Keypad: 6 Keys
Operating Temperature: 0°C to 50°C
Humidity: 5 to 90% RH
Storage Temperature: -10°C to 70°C
Dimensions: 440mm x 325mm x 100mm (LxHxW)
Enclosure: Powder coated metal enclosure
Weight: 6 Kg approximately without batteries.

Usage Features:

The GDS-24-2/4 panel includes a large 16 x 2 LCD display, local buzzer, LEDs for indications, and a keypad for manual operation and configuration.

Display and Indications:
- Large 16 x 2 character LCD Display for system status, fault status, zone alarm status, configuration menus, and history events.
- LED indications on the front panel for various modes: System ON (Green), Mains Fail (Yellow), Battery Fault (Yellow), NAC Fault (Yellow), Silence (Yellow), Twin Alarm (Red), Zone Alarm (Red), Zone Fault/WT (Yellow), and Zone Bypass (Yellow).
- Local buzzer for distinct sounds for Alarm (continuous ON), Faults (1 sec ON and 5 sec OFF), and Walk Test (1 sec ON and 1 sec OFF).
Controls:
- 6 Keys for configuration and programming: MENU (1), SILENCE (2), ENTER (3), '<' (4), RESET (5), and '>' (0). These keys also serve as numeric inputs during configuration.
- Two-level password protection for Admin and user access.
Initiating Device Circuits (IDCs): Class B IDCs for gas and heat detectors.
Notification Appliance Circuit (NAC): One siren circuit with a 24V output, 300 mA max for GDS-24-2 and 450 mA max for GDS-24-4.
Relay Outputs: Three fixed Potential Free Relay Contact outputs for alarm, valve control, and fault.
- Alarm Relay: Activated when the panel detects an alarm.
- Valve Control Relay: Configurable as "Latched" or "Pulsed." In Pulsed mode, the relay turns ON for 3-4 seconds and then OFF. In Latchable mode, it remains ON until the alarm is cleared or the panel is reset. Default is Pulsed mode.
- Fault/Resettable Relay: Configurable as a fault relay or resettable relay. As a fault relay, it turns ON when any fault is detected. As a resettable relay, it is ON by default and turns OFF during a panel reset, then ON again.
Resettable 24VDC Output: Provides up to 450mA of current to power detectors (up to 8 detectors).
Zone Management: Zone Bypass and NAC bypass facility.
Event Logging: Up to 15 scrolling events capacity.
Power Management: 24V DC power supply with built-in battery charger, battery low voltage cut-off at 23 VDC, and standby battery backup up to 8 hours.

System Programming:

The panel is fully programmable on-site via the keypad and LCD, requiring no special software.

Menu Options: Includes Zone Configuration (Enable, Walk Test, Disable), NAC (Enable/Disable), NAC Auto Silence (Enable/Disable, default 10 min), Auto Key Lock (Enable/Disable, default DISABLE), and Password Change (default "1111").
Entering Programming Mode: From normal condition, press MENU, enter the password (if Auto Key Lock is enabled), then access menu functions.
Saving Changes: Press ENTER to save configured data, mode, or values.
Navigation: Use '<' (4) and '>' (0) keys to scroll through menus.

System Operation:

Normal Mode: System ON LED is continuously ON, and the LCD displays "TrueSafe SYSTEM OK." The system continuously monitors for alarms and faults.
Alarm Condition:
- Immediately enters alarm condition if gas is detected in any zone.
- LCD displays "Zone X Alarm ALARM [1/1]."
- Respective zone Alarm LED turns ON, and Common Twin Alarm LED turns ON.
- Internal buzzer produces a steady sound.
- NAC turns ON until silenced or reset, or until silence time is completed.
- Fixed Alarm output relay activates.
- Valve control relay activates to shut off gas supply (pulsed or latchable).
- Gas alarms are latched and do not clear automatically.
- Timer for NAC Silence starts.
- If a zone is in Walk Test mode, it exits Walk Test mode.
Fault Condition:
- Immediately enters fault condition if any fault is detected (Zone circuit, NAC circuit, Mains fail, Battery Low/cut, etc.).
- LCD shows fault message, e.g., "Zone 1 Open FAULT [1/1]" or "NAC Open FAULT [1/1]."
- Respective zone fault LED turns ON.
- Fixed Fault output relay (PFC relay) activates.
- NACs are not active.
- Internal buzzer toggles 1 second ON and 5 seconds OFF, 5 times, then OFF.

Maintenance Features:

Installation Precautions: Emphasizes installation by qualified personnel, protection against electrostatic discharges, and avoiding handling boards with power on. Specifies operating conditions (0°C to +50°C, 90% RH).
Mounting: Provides detailed mounting dimensions for GDS-24-2 and GDS-24-4 panels, including instructions for securing the enclosure and circuit board.
Battery Installation: Instructions for installing 12V, 1.2Ah (GDS-24-2) or 12V, 7Ah (GDS-24-4) sealed lead-acid batteries, emphasizing connections only after applying mains power.
Walk Test:
- Used for maintenance to verify detector performance and panel operation without activating relay outputs.
- Procedure: Put a zone in Walk Test mode (ensure zone is enabled), apply gas to the detector, observe WT-Alarm on LCD, zone alarm LED/siren/buzzer turn ON/OFF three times, and the sensor resets automatically.
- Recommended every 3 months.
Servicing Checklist (Twice a year):
- Clean each Gas detector.
- Check panel operation on battery backup mode (mains OFF).
- Check panel operation on mains supply (Battery disconnected).
- Check all panel connections.
- Perform WALK TEST.
- Check Gas Detector.
- Check siren output.
- Check battery supply.
- Check panel mounting screw.
Periodic Inspection and Test:
- Weekly Testing by User: Check indicators, internal buzzer, LCD messages, rotate manual check points, check detectors for obstructions, and log results.
- Quarterly Test: Perform Walk Test on all zones.
- Annual Test: Test all detectors and check points for correct operation.
- Every 2-3 Years: Clean Gas detectors.
- Every 4 Years: Replace sealed lead-acid batteries (sooner if operating temperature exceeds 25°C continuously).
Pre-Checklist for Call: Verify mains supply, panel supply voltage, battery backup operation, indicator functionality, LCD/buzzer operation, cable connections, gas detector functionality, and perform Walk Test.
Do's: Take responsibility for gas alarm systems, understand system operation, know inspection/testing/maintenance requirements, train personnel, and pay attention to record-keeping.
Don'ts: Ignore reoccurring problems, allow occupants to become apathetic to alarms, allow unqualified personnel to service the system, and forget to consider the gas system when facility changes occur.

Vighnaharta GDS-24-2 Specifications

General

Brand	Vighnaharta
Model	GDS-24-2
Category	Fire Alarms
Language	English

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