The fault shutdown driver is intended to provide an external signal to operate a circuit breaker shunt trip and other alarm lights and/or horns in the event of a shutdown fault. The fault shutdown driver is normally pulled low (sinking up to 100 mA). When a fault occurs the output driver will open, allowing the output to go high, to +24 VDC.
Note: The output driver is "pull down" only. It will not source current when a fault occurs. Use input terminal 50 for a current source. Refer to the Customer Options illustration in Testing And Adjusting, "Wiring Diagrams".
This method was chosen as a safety feature to protect against loss of battery voltage which will also cause the regulator to cease operation and, therefore, the generator voltage to collapse.
The alarm driver is intended to provide an external signal to operate alarm lights and/or horns in the event of an alarm fault condition. The alarm driver is normally pulled low (sinking up to 100 mA). When an alarm occurs, the output driver will open, allowing the output to go high, to +24 VDC.
Note: The output driver is "pull down" only. It will not source current when a fault occurs. Use input terminal 50 for a current source. Refer to the Customer Options illustration in Testing And Adjusting, "Wiring Diagrams".
Note: The alarm output and fault shutdown output drivers may change state during engine cranking, indicating a false alarm or shutdown fault condition. If the "B+"/"B-" inputs to the digital voltage regulator are supplied from the engine cranking batteries, it is likely that insufficient voltage will be present during cranking. Therefore, during cranking the state of the fault shutdown output driver may change. The fault shutdown output driver should be ignored until the crank terminate speed has been reached.
The excitation disable switch is intended to provide a method of disabling the regulator field output (F1 and F2) in a manner which is safe for the regulator internal components. This feature is activated by shorting terminal 42 to terminal 50. Refer to the Customer Options illustration in Testing And Adjusting, "Wiring Diagrams". Activation of the excitation disable switch will also disable the undervoltage shutdown fault.
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The generator will always have residual voltage still remaining; therefore, it is important to stop the generator set if downstream maintenance is to be performed. |
The fault reset contact is provided as a method to reset a resettable shutdown fault through the use of an external switch. This operation is equivalent to using parameter :96 in the user interface. Operating the fault reset contact (momentarily shorting terminal 43 to terminal 50) will reset a resettable fault and allow the voltage to build again. However, on the "original" fault handling versions, the display will still show the flashing fault and the fault will remain in the active position in memory. On the "new" fault handling versions, the display will stop flashing, return to showing ":01", and the fault will remain in the active fault parameter :92. The fault reset contacts should never be continuously shorted together. A momentary contact is all that is necessary to reset the fault.
The generator 52/a auxiliary contact is closed only when the generator breaker is closed. The utility 52/a auxiliary contact is closed only when the breaker which ties the generator to the utility is closed. When BOTH of these breakers are closed the generator is assumed to be operating in parallel to the utility grid. This will activate (enable) the PF/KVAR mode when connected as shown in the wiring diagrams for this manual. It will also enable the reverse power fault if it is not already enabled. See description of parameter :34 in Systems Operation, "Parameters". See also descriptions of fault codes 604, 704, and 705 in Systems Operation, "Fault Codes".
Remote Voltage Adjust Rheostat
The remote voltage adjust rheostat inputs are provided to allow the use of a 10 kOhm rheostat to remotely adjust the regulated voltage level. Increasing the resistance at the input causes the voltage to increase from the level configured in parameter :01. Turning the remote voltage adjust rheostat will not change the value displayed in parameter :01. However, it will modify an internal reference which will cause the generator output voltage to change in proportion to the rheostat movement. The range of the remote voltage rheostat adjustment is limited to a ±10% change in output voltage from the value set in parameter :01. When installing the remote voltage adjust rheostat, always use shielded cable. See parameter :70 for an explanation of using the voltage adjust rheostat in conjunction with the serial communications control.
Remote PF/KVAR Adjust Rheostat
The remote PF/KVAR adjust rheostat inputs are provided to allow the use of a 10 kOhm rheostat to remotely adjust the regulated PF or KVAR level. Connecting a rheostat to this input causes the local values which are programmed in parameters :32 and :33 to become inactive. See description for parameters :32 and :33 for detailed explanation. Varying the remote PF/KVAR rheostat will not change the values displayed in parameters :32 and :33. However, it replaces the internal reference which controls PF or KVAR regulation depending on which mode is selected in parameter :31. Increasing the resistance when in power factor mode causes the power factor to become more lagging, with a range of 0.9 power factor leading to 0.6 power factor lagging. Increasing the resistance when in KVAR mode causes the lagging KVAR reference to increase, with a range of 0.0 to 1.0 Per Unit. When installing the remote PF/KVAR adjust rheostat, always use shielded cable. See parameter :71 for an explanation of using the PF/KVAR adjust rheostat in conjunction with serial communications control.
Remote voltage adjust and PF/KVAR adjust rheostats should be installed with shielded cable. The shield drain wire should be connected to terminal 45 of the digital voltage regulator and be insulated from all other circuits, including Earth ground.
Communication Port Voltage Adjust
Beginning with part number 155-xxxx regulators, a convenient voltage adjust method is available via the communications port. The voltage adjust parameter is available as parameter :70 but cannot be seen from the display on the digital voltage regulator. This parameter allows ±10% voltage adjustment around the nominal value of voltage entered in parameter :01. Further details on the operation of this parameter are discussed in the System Operation, "Parameters". Refer to parameter :70, voltage adjust. Writing a value to this parameter location will NOT cause a write to the EEPROM and will not be saved during a loss of power. This parameter was added to aid in wire reduction so that automatic voltage adjustments can be made by customer supplied equipment for voltage matching during synchronizing by utilizing a communications interface already present.
Communication Port PF/KVAR Adjust
Beginning with part number 155-xxxx regulators, a convenient PF and KVAR adjust method is available via the communications port on the optional PF/KVAR models only. The adjustment parameter is available as parameter :71. The adjustment parameter cannot be seen from the display on the digital voltage regulator. This parameter allows full range of PF or KVAR adjustment depending on which mode is active (via parameter :31 selection). Further details on the operation of this parameter are discussed in System Operation, "Parameters". Refer to parameter :71, PF/KVAR adjust. Writing a value to this parameter location will NOT cause a write to the EEPROM and will not be saved during a loss of power. This parameter was added to aid in wire reduction so that automatic adjustments can be made by customer supplied equipment for PF or KVAR correction by utilizing a communications interface already present. Adjustments made to this parameter will not be effective unless the regulator is operating in the PF/KVAR control mode with terminal 41 closed.
When the digital voltage regulator is remotely installed from the generator, special care should be given in the installation process to ensure proper engineering procedures are followed to prevent electromagnetic noise from reducing the performance of the regulator. While the digital voltage regulator has been designed to meet the 89/336/EEC Electromagnetic Compatibility Directive, poor wiring practices can generate electromagnetic noise levels much greater than the levels the regulator was designed to accomodate. When remote mounting the regulator, the sensing wires, PMG wires, and F1 and F2 exciter field wires should each be routed in their own separate tray or conduit. The optional customer wiring should be separated from all other signals in a control wiring conduit only. The voltage sensing wires attached to terminals 20, 22, and 24 should be twisted together. The F1 and F2 exciter field wires should also be twisted together. The droop current transformer burden resistor, R1, should be mounted within
An optional manual voltage control may be used to provide a backup method for controlling the generator output voltage in case of failure of the digital voltage regulator. This device will manually adjust the output voltage by controlling the current flow to the exciter stator (L1). The manual voltage control has a mode selector switch and a voltage adjust dial. The selector switch can be set to MAN, OFF, or AUTO. When the switch is in the MAN position, the generator output voltage is controlled by the manual control by varying the amount of current to the exciter stator via the voltage adjust dial. When the switch is in the OFF position, no current will flow to the exciter stator and the generator output voltage will be zero. In the AUTO position, the manual voltage control will be bypassed, and the generator output voltage will be controlled by the digital voltage regulator.
Note: The manual voltage control must not be installed in a location that is subject to engine vibrations or directly to outside weather.
Note: When the manual voltage control is operating in the "MAN" mode, it is not necessary for the digital voltage regulator to be connected to the generator. If the digital voltage regulator remains installed and powered on during manual control, it will annunciate the loss of frequency fault (fault code 803) since the PM input is disconnected and the regulator will no longer be able to sense the frequency.