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Key Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 129478-01 (High Voltage DC PIM) |
| Input Voltage Range | 88 to 140 Vdc |
| Module Height | Half-height (installs in left-side rack slots) |
| Redundancy Support | Supports dual power supply configuration |
| Operating Temperature | -30°C to +65°C |
| Input Frequency | 47 to 63 Hz (if applicable to mixed AC/DC setups) |
| Physical Dimensions | 120.7 mm x 25.4 mm x 114.3 mm (H x W x D) |
| Weight | 0.34 kg (PIM unit only) |
| Compatibility | Requires matching HVDC Power Supply unit |
Product Introduction
The Bently Nevada 3500/15 (specifically part number 129478-01) is a High Voltage DC Power Input Module (PIM). It serves as the critical interface that accepts external 88 to 140 Vdc input and routes it to the associated 3500 power supply unit, which then powers the entire 3500 machinery protection rack.This module is essential for facilities using DC control power, such as turbine control panels or substations. Its primary value lies in supporting fully redundant power architectures. You can install two of these modules in the dedicated left-side slots of a 3500 rack—one acting as the main source and the other as a seamless backup—ensuring continuous monitoring even during a primary power failure.
Installation & Configuration Guide
Follow these steps to safely integrate the 129478-01 into your 3500 rack. Always adhere to site-specific electrical safety protocols.1. Preparation (10 min)
- Verify the input power is completely disconnected at the source.
- Check the label on the module to confirm it reads “129478-01” and matches your system’s High Voltage DC requirement.
- Ensure you have the correct mating connector and wiring gauge as specified in the 3500 Frame Installation manual.
2. Removal of Old Module (5–10 min)
- If replacing an existing PIM, carefully disconnect the field wiring from the terminal block. (Tip: Take a clear photo of the wiring before disconnecting anything).
- Unscrew the mounting hardware securing the module to the rack frame.
- Gently slide the old module out of the slot.
3. Installation (10 min)
- Insert the new 129478-01 module into the designated half-height slot on the left side of the 3500 rack.
- Secure the module firmly using the provided screws. Do not overtighten.
- Reconnect the field wiring to the terminal block, ensuring tight connections to prevent arcing.
4. Power-On & Test (10 min)
- Double-check all wiring polarity.
- Restore the external 88-140 Vdc power source.
- Observe the OK LED on the associated 3500/15 Power Supply unit. It should illuminate steadily, indicating the rack is receiving stable power.
Troubleshooting Quick Reference
| Symptom | Probable Cause | Action |
|---|---|---|
| Rack has no power | No input voltage detected | Measure voltage at the PIM terminals. Ensure it is between 88-140 Vdc. |
| Intermittent power loss | Loose field wiring | Tighten terminal screws. Verify wire gauge meets specifications. |
| OK LED is off/blinking | Blown internal fuse | Check the spare fuse kit. Replace if necessary (ensure power is OFF first). |
| Redundancy fail alarm | Second PIM not seated correctly | Reseat the backup power module and verify its input voltage. |
Dimensions, Mounting & Wiring Notes
- Dimensions: The 129478-01 PIM measures 120.7 mm (H) x 25.4 mm (W) x 114.3 mm (D).
- Mounting: This is a half-height module designed exclusively for the two specific slots located on the far left of the standard Bently Nevada 3500 rack.
- Wiring Warning: Ensure your external DC power source can supply enough current for the full rack load plus a 20% safety margin. Undersized power supplies will cause voltage droop and erratic monitoring behavior.
FAQ
Q1: Is the 129478-01 the whole power supply or just a part of it?
A: Good question. The 129478-01 is specifically the Power Input Module (PIM)—basically the backplate that connects your wires. It mates with the actual 3500/15 Power Supply unit that sits next to it in the rack. You need both to make the system work.Q2: Can I use this module if my plant uses 110V AC power?
A: No. The 129478-01 is strictly for High Voltage DC applications (88 to 140 Vdc). If your facility runs on AC, you need the AC version of the 3500/15 PIM (typically part numbers like 125840-01 or the Universal AC PIM). Mixing AC and DC modules will damage the equipment.Q3: I’m worried about compatibility. Will this work with my older 3500 rack?
A: Generally, yes. However, Bently Nevada has released updated versions of the 3500/15 over the years. While the PIMs are usually backward compatible within their voltage class, always cross-reference your rack’s firmware requirements with the OEM datasheet to be absolutely sure.Q4: What happens if one power module fails? Will my monitoring stop?
A: If you have installed two power supplies (redundant configuration), the rack will automatically switch to the surviving power supply without interrupting operation. This is why installing a second 3500/15 module is highly recommended for critical machinery.Q5: Does this come with a warranty?
A: Yes, all new original surplus units come with a standard functional warranty. We verify the part numbers and physical condition before shipping. For specific warranty duration terms, please check with our sales team directly.
