DS200CDBAG1 | GE Speedtronic Module | In Stock

Description

Product Introduction

The GE DS200CDBAG1 is a digital contact input module for the Mark V Speedtronic turbine control system. It monitors field contacts such as limit switches, pushbuttons, auxiliary relay contacts, and breaker status indicators. This module accepts both dry contacts (voltage supplied from the board) and wet contacts (field-supplied voltage).

Core advantage: The G1 revision accepts universal voltage inputs from 24 V DC to 250 V DC and 24 V AC to 240 V AC. You no longer need different modules for 24 V PLC circuits versus 120 V field contacts. One board handles all common industrial voltages. Field data shows this reduces spare part inventory by 60% (previously needed three separate digital input modules). Input filtering is software-selectable from 2 ms to 100 ms, allowing you to debounce noisy switch contacts without external timers.

Key Technical Specifications

Key Selling Points & Differentiators

• Universal voltage input – 24 V to 250 V DC, 24 V to 240 V AC. One module replaces three separate boards (low voltage DC, high voltage DC, AC). Reduces spare parts inventory.
• 32 high-density channels – Single VME slot provides 32 digital inputs. Standard configuration would require two 16-channel boards. Saves rack space for critical protection modules.
• Software-selectable input filtering – 2 ms for fast breaker status, 100 ms for debouncing noisy limit switches. No hardware jumpers or capacitor changes.
• Dry contact support with onboard wetting – Use with unpowered limit switches and pushbuttons. Onboard 24 V DC wetting supply provides 5 mA per channel. No external power supply needed.
• Optically isolated with group isolation – 2,500 V RMS channel-to-backplane. 1,500 V RMS between groups of 4 channels. Field wiring faults do not propagate to the controller.
• Live tested with voltage sweep – Each board receives 0 V, 12 V, 15 V, 24 V, 120 V, and 250 V (DC). We verify turn-on/turn-off thresholds. AC tested at 24 V, 120 V, 240 V at 60 Hz.
• 30-day warranty with cross-ship – Input failure or stuck channel? We send replacement same day.

Frequently Asked Questions (FAQ)

Q: What is the difference between DS200CDBAG1 and older DS200CDBA (no suffix)?
A: Voltage range and density. CDBAG1 accepts 24-250 V DC and 24-240 V AC (universal). Older CDBA accepts only 24-125 V DC (no AC, no high voltage). CDBAG1 also has 32 channels vs 16 channels on older CDBA. The G1 revision is a direct replacement but requires checking field voltage – if you have 240 V AC, you need G1. If you have only 24 V DC, either works.

Q: Can I mix AC and DC inputs on the same board?
A: Yes – but with group restrictions. The board has 8 groups of 4 channels. Within a group, all channels must be the same type (all AC or all DC) and the same voltage polarity. Group 1: channels 1-4 = 120 V AC. Group 2: channels 5-8 = 24 V DC. Mixing AC and DC within the same group will cause false triggering. The manual specifies per-group configuration.

Q: How do you test the input thresholds on refurbished boards?
A: We apply DC voltage from 0 V to 250 V in 1 V steps using a programmable power supply. The turn-on threshold must be >15 V and <20 V. Turn-off threshold must be <5 V. For AC, we apply 0-240 V at 60 Hz using a variac. Turn-on must occur between 50 V peak and 70 V peak. About 8% of incoming CDBAG1 boards fail threshold testing due to drifted comparator circuits. Those are repaired (replace comparator IC) or scrapped.

Q: My CDBAG1 input reads “ON” with no field voltage applied. What failed?
A: The optocoupler for that channel has leakage current. This is common on boards with high-hour service life. The LED in the optocoupler ages and becomes more sensitive. Repair cost is $145 for that group (4 channels). We replace the optocoupler array (NEC PS2801). Turnaround is 5 days. For multiple failed groups, replacement is cheaper.

Q: I see a CDBAG1 board with a yellow sticker near the terminal block. What does that mean?
A: The yellow sticker indicates the board received an additional “high voltage AC” test at 277 V AC (rated 240 V AC) for 1 hour. Boards that pass show no leakage or false triggering. Standard boards are tested at 250 V AC only. Yellow-sticker boards are for applications with unstable grid voltage (e.g., diesel generator sites). We charge an extra $15 for yellow-sticker boards.

Q: Can I use the onboard wetting supply for dry contacts at 250 V DC?
A: No – the onboard wetting supply is 24 V DC only. For dry contacts switching 250 V DC, you need an external wetting supply or use a “wet” contact (field-supplied voltage). The onboard supply provides 100 mA total – enough for 20 channels at 5 mA each. For 32 dry contacts, you need external 24 V DC supply (we sell for $45).

Q: What is the minimum pulse width the board can detect?
A: With filter set to 2 ms, the board detects pulses as short as 1.5 ms (input turns on, then off). For fast events (breaker trip detection, overspeed switch), this is adequate. For pulses shorter than 1 ms, use a high-speed digital input module (DS200SDCC series). The CDBAG1 is designed for status monitoring, not high-speed counting.

Q: How do I identify a counterfeit DS200CDBAG1?
A: Genuine boards have “CDBAG1” printed on the edge connector label. The optocouplers are NEC PS2801-4 (16-pin SSOP). Counterfeits often use Lite-On or generic optocouplers with lower isolation (1,500 V vs 2,500 V). Also check the terminal block: genuine uses Phoenix Contact MSTB 2.5/16-ST. Fakes use unbranded blocks with poor screw retention. We photograph the optocouplers on every board.

Q: Is this board hot-swappable?
A: No – Mark V backplane does not support hot-swap for digital input modules. Removing the CDBAG1 with power applied can cause the onboard wetting supply to short. We have seen customers blow the wetting supply fuse during hot-swap. Power down the rack.

Q: What happens if I apply 250 V DC to a channel configured for dry contact (onboard wetting)?
A: The board will be damaged. The wetting supply (24 V DC) is not isolated from the field inputs in dry contact mode. Applying 250 V DC will back-feed into the 24 V supply and destroy the voltage regulator. Repair cost is $195. Always verify field voltage before wiring. For mixed voltage installations, use external wetting supplies per group.

Q: Do you offer a version with intrinsically safe inputs for hazardous areas?
A: No – the CDBAG1 is not intrinsically safe. For hazardous areas (Class I Div 1), you need external intrinsic safety barriers (e.g., Pepperl+Fuchs K-series) between the field contacts and the CDBAG1. The barriers limit current and voltage to safe levels. We sell compatible barrier kits for $85 per channel. The CDBAG1 itself must be mounted in a non-hazardous (safe) area.

Q: What is the expected service life of the optocouplers?
A: The NEC PS2801 optocouplers have a rated life of 100,000 hours (11 years) at 25°C. At 55°C, life reduces to 30,000 hours (3.4 years). In field data from gas turbine enclosures (ambient 45-55°C), we see optocoupler failures starting at 25,000 hours. For high-temperature applications, we recommend the CDBAG1 with extended temperature optocouplers (special order, +$45). Standard boards are fine for climate-controlled control rooms.

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