Overview
Configured for relay output execution in the Bently Nevada 3500 Machinery Protection System, the Bently Nevada 3500/33, also cataloged as the 3500/33 16-Channel Relay Module, provides direct electrical switching for alarm, trip, and external control circuits. The module converts internal rack monitoring states into physical relay actions through programmable logic.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 3500/33 16-Channel Relay Module |
| Brand | Bently Nevada |
| Product Type | 16-Channel Relay Modules |
| System Platform | 3500 Machinery Protection System |
| Origin | USA |
| Weight | Main Module: 0.7 kg; I/O Module: 0.4 kg |
| Dimensions | Main Module: 241 mm x 24.4 mm x 242 mm; I/O Module: 241 mm x 24.4 mm x 99.1 mm |
| Operating Temp | -30 deg C to +65 deg C |
| Storage Temp | -40 deg C to +85 deg C |
| Humidity | 95%, non-condensing |
| Power Consumption | 5.8 Watts typical |
| Rack Space | 1 full-height front slot plus 1 full-height rear I/O slot |
| Relay Type | SPDT / Form C relay |
| Relay Quantity | 16 independent relay outputs |
| Relay Configuration | Four groups of four channels, selectable Normally Energized (NE) or Normally De-energized (ND) |
| Contact Rating AC | 5 A maximum current, 250 VAC maximum voltage, 1200 VA maximum power |
| Contact Rating DC | 5 A maximum current, 125 VDC maximum voltage |
| DC Switching Power | 70 W at 24 VDC, 10 W at 48 VDC, 9 W at 60 VDC |
| Minimum Contact Load | Standard contacts: 100 mA at 5 VDC; Gold-plated option: 1 mA at 1 VDC |
| Arc Suppressor | 250 Vrms standard installation |
| Relay Sealing | Epoxy-sealed relay construction |
| Relay Contact Life | Up to 100,000 cycles depending on load |
| Certification | CSA/NRTL/C Class I Division 2, ATEX / IECEx Class I Zone 2 options, CE EMC compliant |
Rotor Protection Relay Logic and Signal Execution
The 3500/33 Relay Module executes programmed relay actions based on machinery monitoring states from the 3500 rack. Therefore, each relay channel can respond to Alert, Danger, Not-OK conditions, or individual measured variables from monitor channels.
The module supports Boolean AND and OR voting logic through the 3500 Rack Configuration Software. In addition, operators can configure each relay output independently to match specific shutdown, alarm, or control requirements.
For Bently Nevada machinery monitoring applications, the relay module operates with protection logic associated with vibration monitoring, rotor dynamics evaluation, and machine condition signals. The relay execution path maintains separation between measurement processing and external switching circuits.
Frequently Asked Questions
Q: How many relay outputs does the Bently Nevada 3500/33 provide?
A: The module provides 16 independent relay outputs using SPDT / Form C relay contacts.
Q: Can the relay operating mode be configured for different shutdown philosophies?
A: Yes. The relay channels are divided into four groups of four channels, and each group supports Normally Energized (NE) or Normally De-energized (ND) operation.
Q: Does the 3500/33 support programmable relay voting logic?
A: Yes. The 3500 Rack Configuration Software allows relay outputs to use AND and OR Boolean logic based on rack monitoring conditions.
Field Installation Guidelines
Install the 3500/33 module only in compatible 3500 rack positions located to the right of the Transient Data Interface (TDI) module.
Verify that the front module and rear I/O module are correctly seated in their rack connectors before applying power. Ensure that relay wiring follows the required contact configuration and that external circuits remain within the specified contact ratings.
Route relay output wiring separately from high-current power cables and high-frequency switching conductors to reduce electrical interference. Use appropriate grounding methods for shielded signal cables when required by the installation design.
Before commissioning, verify relay channel assignments, NE/ND configuration, and programmed voting logic through the 3500 Rack Configuration Software.
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