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DANGER: Shock/Electrocution Hazard-Do not operate this equipment or work on this equipment unless you have read and understand the instructions and warnings in the Operation and Maintenance Manual. Failure to follow the instructions or heed the warnings will result in serious injury or death. |
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Personal injury or death can result from high voltage. When power generation equipment must be in operation to make tests and/or adjustments, high voltage and current are present. Improper test equipment can fail and present a high voltage shock hazard to its user. Make sure the testing equipment is designed for and correctly operated for high voltage and current tests being made. When servicing or repairing electric power generation equipment:
Failure to do so could result in personal injury or death. Make sure residual voltage in the rotor, stator and the generator is discharged. |
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Accidental engine starting can cause injury or death to personnel working on the equipment. To avoid accidental engine starting, disconnect the battery cable from the negative (−) battery terminal. Completely tape all metal surfaces of the disconnected battery cable end in order to prevent contact with other metal surfaces which could activate the engine electrical system. Place a Do Not Operate tag at the Start/Stop switch location to inform personnel that the equipment is being worked on. |
The voltage regulator is located in the enclosure for the control panel or in the terminal box on the generator.
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| Illustration 1 | g03827032 |
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The voltage regulator is located in the terminal box on the generator or in the enclosure for the control panel. | |
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| Illustration 2 | g06156843 |
The generator set may include one of the following voltage regulators.
Integrated Voltage Regulator (IVR)
The Integrated Voltage Regulator (IVR) provides excitation current to the generator. The IVR is controlled by the IVR function in the EMCP4. The IVR function allows the EMCP4 to control the generator voltage, optimize transient performance, and provide feature specification.
The excitation module may interface with any of the following excitation systems: Self-Excitation (SE), Internal Excitation (IE), and Permanent Magnet (PMG) excitation systems.
For additional information about the IVR, see Application and Installation, LEBE0006, and Special Instruction, REHS9106.
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| Illustration 3 | g06157009 |
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Excitation Module 10 (EM10–A) (1) Connector P3 (2) Connector P2 (3) Connector P4 | |
To regulate the generator terminal voltage, the EMCP communicates the desired excitation command to the excitation module through a pulse width modulation (PWM) signal. A twisted pair of shielded cable must be used for the communication link. Table 1 details the connections to be made between the EMCP and Excitation Module.
| EMCP 4.1 and EMCP 4.2 Connections to Excitation Module (70-pin connector) | |||
| EMCP 4.1 and EMCP 4.2 70-Pin Connector | Excitation Module 3-Pin Connector | ||
| Digital Output #2 / IVR CS+ | 68 | CS+ | P3-2 |
| Battery negative splice | 60 or 65 | CS- | P3-3 |
| Battery negative splice | 60 or 65 | Shield | P3-1 |
| EMCP 4.3 and EMCP 4.4 Connections to Excitation Module (120-pin connector) | |||
| EMCP 4.3 and EMCP 4.4 120-Pin Connector | Excitation Module 3-Pin Connector | ||
| PWM Output #2 Positive | 28 | CS+ | P3-2 |
| PWM Output #2 Negative | 8 | CS- | P3-3 |
| Shield | 19 | Shield | P3-1 |
Table 2 provides information on the technical specification of the EM10 and EM15 modules. Selection of the appropriate module must be determined by the following:
- Nominal and maximum generator excitation current at full load (standby 0.8 PF).
- The maximum AC voltage input.
| EM10 and EM15 Technical Specifications | ||
| EM10–A | EM15–A | |
| Compatible Generator Excitation Types | Permanent Magnet (PM) Self-Excitation (SE) Internal Excitation (IE/AREP)(1) | |
| Nominal Field Current Output | 6A | 7A |
| Maximum (forcing) Field Current Output | 10A | 15A |
| Maximum AC Voltage Input | 240Vms | 300Vms |
| (1) | Internal Excitation (IE is also referred to as “Auxiliary Regulation Excitation Principle”(AREP) |
IVR Excitation Module Connections
The EM10 and EM15 excitation modules have three plug type multiple-pin connectors. The connectors are labeled P2, P3, and P4 as shown in illustration 3. Table 3 describes the signal and function of each connector pin.
| Excitation Module Connections | ||
|---|---|---|
| Terminal | Label | Signal/Function |
| P2-1 | F+ | Exciter Field Positive |
| P2-2 | F- | Exciter Field Negative |
| P3-1 | Shield | Excitation Command Control Signal Shield |
| P3-2 | CS+ | Excitation Command Control Signal Positive |
| P3-3 | CS- | Excitation Command Control Signal Negative |
| P4-1 | ZB | Excitation Power Supply Input X2 |
| P4-2 | XA | Excitation Power Supply Input Z1 |
| P4-3 | ZA | Excitation Power Supply Input X1 |
| P4-4 | XB | Excitation Power Supply Input Z2 |
Note: The ZB and XA connections are internally linked within the excitation module. The link provides a point of common connection for the auxiliary windings where an AREP or IE excitation supply is available. Also, the ZB and XA connections may be linked externally to the excitation module. Only three connections (ZA, ZB, and XB) are needed for the EM. Refer to Systems Operation/Test and Adjust/Troubleshooting, UENR1209, "Integrated Voltage Regulator Connections" for excitation module wiring connections. The wiring diagrams are for self-excitation (shunt), auxiliary windings (AREP/IE), and permanent magnet (PM) configurations.
The voltage regulator knee frequency must be configured for your specific package requirements. The knee frequency for 50 Hz operation will usually be between 48.0 and 49.8 Hz. For 60 Hz operation, the parameter must be set between 58.0 to 59.8 Hz.
Refer to Illustration 2 for an example under-frequency roll-off (loading) profile.
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| Illustration 4 | g03487998 |
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Under-frequency (loading) profile slope1 = 1.0 V/Hz, slope2 = 2.0 V/Hz | |