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Description
Second-generation R731 digital.
Did you know
- The Leroy-Somer R731-Mk2, often referred to simply as the R731, is an optional three-phase sensing module designed to be used with Leroy-Somer's single-phase sensing automatic voltage regulators (AVRs). While the exact launch year of the 'Mk2' designation is not explicitly stated, the R731 module itself has been in use for some time, with references to older R731 modules having an ST1 jumper that was later discontinued.
- The R731-Mk2 is not a standalone AVR but rather an enhancement module within Leroy-Somer's range, specifically designed to augment the capabilities of their single-phase sensing AVRs such as the R250, R438, R448, and R449. It transforms these AVRs from dual-phase (monitoring lines 1 and 3) to comprehensive three-phase monitoring solutions.
- The primary strength of the R731-Mk2 lies in its ability to provide full three-phase voltage sensing, addressing a critical gap where standard AVRs might only monitor two phases. This comprehensive monitoring ensures balanced voltage regulation, protects against phase loss, and enhances overall generator system reliability, making it vital for critical applications like data centers and healthcare facilities.
| Model | Function | Voltage Sensing | Max Continuous Current | Voltage Droop Adjustment |
|---|---|---|---|---|
| R731-Mk2 | Three-phase sensing module (enhances AVRs) | Three-phase (via three 2VA transformers) | 1.3A | Adjustable (minimum 8% at 0 power factor and 1A from paralleling CT) |
| R450 | Automatic Voltage Regulator | Single-phase (can be three-phase with R731 module) | 10A (for 10s overload) | Adjustable (0 to 8% with PF=0.8 for 400V applications) |
| R250 | Automatic Voltage Regulator | Single-phase (can be three-phase with R731 module) | 8A (fuse, supports 10A for 10s) | Adjustable (via potentiometer P2) |
Competitive Models
^ZVCX DSEA106
Original DSEA106 (pre-MKII, legacy service).
^ZVEF SE500
Higher-capacity analog AVR.
^ZVAF SX421
Earlier shunt-excited variant, still serviced on older sets.
^ZVCU DSE0700 MKII
Pocket-size genset control.
^ZVCT DSE8510 MKII
Legacy power management (service).
Send enquiry
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Code map
^Z V B M │ │ │ └── Model: R731-Mk2 │ │ └───── Make: Leroy-Somer (Nidec) │ └──────── Equipment: Automatic Voltage Regulator └─────────── System: Automation Spares