Description
Bently Nevada 3300/05-26-00-00 System Rack
The Bently Nevada 3300/05-26-00-00, also cataloged as the 3300/05 System Rack, operates as a dedicated hardware backplane and power distribution enclosure for hosting 3300-series monitors, power supplies, and a system monitor module within the 3300 Machinery Protection System.
Suffix Breakdown & Model Matrix
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Option Code
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Specification
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3300/05
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3300 Series System Rack
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-26
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Rack Size & Mounting: 19-inch Rack Mount, 14 Slots, High-Inrush
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-00
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Panel Wiring Options: Standard Termination
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-00
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Agency Approval: None (Standard Compliance)
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Hardware Specifications
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Parameter
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Specification
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Brand
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Bently Nevada
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Origin
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USA
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Weight
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8.2 kg (empty chassis)
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Dimensions
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19-inch EIA Rack Mount, 14 Monitor Slots + P/S & SysMon bays
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Operating Temp
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0 degC to +65 degC
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Storage Temp
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-40 degC to +85 degC
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Relative Humidity
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95% non-condensing
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Backplane
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Multi-layer PCB with power distribution and alarm communication bus
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Inrush Capability
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High-Inrush rated (-26 option) for fully loaded startup
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Termination
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Rear-panel screw terminal strips
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Rotor Dynamics and Cross-Talk Suppression on Backplane Bus
The 3300/05 backplane distributes the System Monitor's alarm voting logic and OK status across all installed monitor modules. Proper slot assignment is required to maintain channel isolation and suppress cross-talk between adjacent velocity or proximity monitor cards measuring rotor dynamics on the same shaft line. The high-inrush power distribution plane minimizes voltage droop during simultaneous relay pickup, ensuring that Danger contact closures are not compromised by backplane sag. Gap voltage reference lines for proximity systems are routed through the backplane and must be verified for continuity during initial rack commissioning.
Frequently Asked Questions
Q: How many monitor modules can be installed in the 3300/05-26-00-00?
A: Fourteen (14) single-width monitor slots are available. One slot must be occupied by the 3300/20 System Monitor, and one or two slots are reserved for the 3300/12 or 3300/14 Power Supply modules depending on redundancy requirements.
Q: Is the 3300/05-26-00-00 compatible with 3500 series modules?
A: No. The 3300 racks and backplanes are mechanically and electrically incompatible with 3500 series I/O and power supply modules.
Q: What does the High-Inrush (-26) option provide?
A: The high-inrush capable backplane and fusing accommodate the initial surge current when a fully populated rack with multiple relays and monitors is powered on, reducing nuisance breaker trips on the external 120/240 VAC supply.
Field Installation Guidelines
Install the empty rack into a standard 19-inch EIA cabinet using four M6 or 1/4-inch cage nuts and ensure the rack frame is bonded to plant earth ground. Insert the 3300/12 Power Supply and 3300/20 System Monitor into their designated leftmost slots before populating monitor modules. All field transducer shields must be terminated to the rack ground bus bar at the rear terminal strip—never at both ends. Verify backplane jumper settings on the System Monitor for alarm logic (AND/OR voting) prior to applying AC power. Perform a rack OK check after installation to confirm backplane continuity and power supply regulation before connecting field sensors.
