The Bently Nevada 87890-01 is a Monitor Circuit Assembly used in the 3300/03 System Monitor for Bently Nevada 3300 machinery monitoring racks.
The assembly forms part of the System Monitor electronics responsible for rack-level monitoring and control functions. The 3300/03 architecture provides System Reset, Inhibit, OK, Trip Multiply, and Keyphasor-related functions within the 3300 monitoring system.
The System Monitor also coordinates the rack OK logic. Individual monitor OK relay drives feed the rack OK bus, while the System Monitor and Power Input Module determine the final OK relay state.
When replacing an 87890-01 assembly, the complete 3300/03 catalog configuration and any modification information should be identified before installation. Programmable options must match the original System Monitor configuration.
Monitor Circuit Assembly for the Bently Nevada 3300/03 System Monitor
Part number 87890-01
Used within the 3300 machinery monitoring system
Supports rack-level System Monitor functions
Associated with System Reset and Inhibit functions
Interfaces with rack OK relay logic
Supports Trip Multiply control functions
Associated with Keyphasor signal handling
Programmable according to the installed 3300/03 configuration
Replacement configuration should match the original catalog and modification data
Maintenance of Bently Nevada 3300 monitoring racks
Repair of 3300/03 System Monitor assemblies
Rack-level machinery protection system servicing
Replacement of an existing 87890-01 circuit assembly
Restoration of System Monitor control and supervisory functions
| Parameter | Specification |
|---|---|
| Manufacturer | Bently Nevada |
| Part Number | 87890-01 |
| Product Type | Monitor Circuit Assembly |
| Associated Module | 3300/03 System Monitor |
| System | Bently Nevada 3300 |
| Programmable -VT Option | -18 Vdc or -24 Vdc |
| Operating Temperature | 0 to +65 degC |
| Storage Temperature | -40 to +85 degC |
| Relative Humidity | 0 to 95%, noncondensing |
| Function | Description |
|---|---|
| System Reset | Rack-level reset contact function |
| System Inhibit | Provides rack inhibit control |
| OK Bus | Receives OK relay drive status from installed monitors |
| Trip Multiply | Supports external Trip Multiply contact functions |
| Keyphasor | Provides Keyphasor-related signal and power functions |
| System Power-Up Inhibit | Includes power-up inhibit timing within the System Monitor architecture |
| Parameter | Specification |
|---|---|
| +VRH | 23.65 +/- 6.35 Vdc |
| +VRL | 11.22 +/- 3.09 Vdc |
| +7.5 V | 7.5 +/- 0.1 Vdc |
| +5 V | 5.00 +/- 0.05 Vdc |
| REF | 5.00 +/- 0.009 Vdc |
| -7.5 V | -7.5 +/- 0.1 Vdc |
| -VT, -24 V Option | -23.75 +/- 0.45 Vdc |
| -VT, -18 V Option | -17.9 +/- 0.4 Vdc |
| System Power-Up Inhibit Delay | 2.1 +/- 1 seconds |
| Parameter | Specification |
|---|---|
| -24 V Option | -23.2 to -24.2 V, short-circuit protected |
| -18 V Option | -17.4 to -18.3 V, short-circuit protected |
Verify the replacement part number 87890-01 before installation.
Record the complete 3300/03 catalog number and modification number before removing the original assembly.
Match all programmable options to the existing System Monitor configuration.
Confirm that the System Monitor and Power Supply use the same -VT setting.
Inspect rack connectors and mating interfaces before installing the circuit assembly.
Apply power and verify that the System Monitor reaches normal operation after the power-up inhibit period.
Check rack OK logic and Keyphasor functions before returning the monitoring system to service.
87890-01 is the Monitor Circuit Assembly, not the complete 3300/03 System Monitor.
The Front Panel Assembly is listed separately in the Bently Nevada spare-parts structure.
Replacement orders should identify the complete 3300/03 catalog number together with 87890-01.
Modified monitors should also be identified by their modification number.
Global Express Shipping
Returns & Warranty
Manufacturer: Bently Nevada
Product No.: 87890-01
Country of origin:United States
Product Type: Monitor Circuit Assembly
Payment: T/T, Western Union
Weight: 0g
Shipping port: Xiamen
Warranty: 12 months
The Bently Nevada 87890-01 is a Monitor Circuit Assembly used in the 3300/03 System Monitor for Bently Nevada 3300 machinery monitoring racks.
The assembly forms part of the System Monitor electronics responsible for rack-level monitoring and control functions. The 3300/03 architecture provides System Reset, Inhibit, OK, Trip Multiply, and Keyphasor-related functions within the 3300 monitoring system.
The System Monitor also coordinates the rack OK logic. Individual monitor OK relay drives feed the rack OK bus, while the System Monitor and Power Input Module determine the final OK relay state.
When replacing an 87890-01 assembly, the complete 3300/03 catalog configuration and any modification information should be identified before installation. Programmable options must match the original System Monitor configuration.
Monitor Circuit Assembly for the Bently Nevada 3300/03 System Monitor
Part number 87890-01
Used within the 3300 machinery monitoring system
Supports rack-level System Monitor functions
Associated with System Reset and Inhibit functions
Interfaces with rack OK relay logic
Supports Trip Multiply control functions
Associated with Keyphasor signal handling
Programmable according to the installed 3300/03 configuration
Replacement configuration should match the original catalog and modification data
Maintenance of Bently Nevada 3300 monitoring racks
Repair of 3300/03 System Monitor assemblies
Rack-level machinery protection system servicing
Replacement of an existing 87890-01 circuit assembly
Restoration of System Monitor control and supervisory functions
| Parameter | Specification |
|---|---|
| Manufacturer | Bently Nevada |
| Part Number | 87890-01 |
| Product Type | Monitor Circuit Assembly |
| Associated Module | 3300/03 System Monitor |
| System | Bently Nevada 3300 |
| Programmable -VT Option | -18 Vdc or -24 Vdc |
| Operating Temperature | 0 to +65 degC |
| Storage Temperature | -40 to +85 degC |
| Relative Humidity | 0 to 95%, noncondensing |
| Function | Description |
|---|---|
| System Reset | Rack-level reset contact function |
| System Inhibit | Provides rack inhibit control |
| OK Bus | Receives OK relay drive status from installed monitors |
| Trip Multiply | Supports external Trip Multiply contact functions |
| Keyphasor | Provides Keyphasor-related signal and power functions |
| System Power-Up Inhibit | Includes power-up inhibit timing within the System Monitor architecture |
| Parameter | Specification |
|---|---|
| +VRH | 23.65 +/- 6.35 Vdc |
| +VRL | 11.22 +/- 3.09 Vdc |
| +7.5 V | 7.5 +/- 0.1 Vdc |
| +5 V | 5.00 +/- 0.05 Vdc |
| REF | 5.00 +/- 0.009 Vdc |
| -7.5 V | -7.5 +/- 0.1 Vdc |
| -VT, -24 V Option | -23.75 +/- 0.45 Vdc |
| -VT, -18 V Option | -17.9 +/- 0.4 Vdc |
| System Power-Up Inhibit Delay | 2.1 +/- 1 seconds |
| Parameter | Specification |
|---|---|
| -24 V Option | -23.2 to -24.2 V, short-circuit protected |
| -18 V Option | -17.4 to -18.3 V, short-circuit protected |
Verify the replacement part number 87890-01 before installation.
Record the complete 3300/03 catalog number and modification number before removing the original assembly.
Match all programmable options to the existing System Monitor configuration.
Confirm that the System Monitor and Power Supply use the same -VT setting.
Inspect rack connectors and mating interfaces before installing the circuit assembly.
Apply power and verify that the System Monitor reaches normal operation after the power-up inhibit period.
Check rack OK logic and Keyphasor functions before returning the monitoring system to service.
87890-01 is the Monitor Circuit Assembly, not the complete 3300/03 System Monitor.
The Front Panel Assembly is listed separately in the Bently Nevada spare-parts structure.
Replacement orders should identify the complete 3300/03 catalog number together with 87890-01.
Modified monitors should also be identified by their modification number.
Global Express Shipping
Returns & Warranty
Orders are processed and delivered Monday-Friday (excluding public holidays).
For full eligibility, restocking fees, and international return details, please view our official Refund & Return Policy .
| Country of origin |
United States
|
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