MXR845x - Digitally Controlled Electronic Potentiometer
- User settable Offset, Span and Response
- Analogue outputs match any governor
- Instant reset gives full control of engine restart
- Power capacity limiting function
- Accuracy within 0.5 milliV and 5 microA increments
- Ultra reliable, no moving part
Designed for use with Megacon synchronising and load sharing units or to give speed reference to any electronic regulator or AVR controllers.
MXR845x will accept any volt free input such as push buttons or PLC digital outputs. Offset, Span, Ramp response and 4-step output matching resistance are user setable to suit any specific characteristic. Four output resistance levels are available together with two ramp ranges (rate 1 or 2, see specifications).
The 4-20mA output follows the -2 to 10V output on MXR845CI and can be used independently or both at the same time. The two outputs are NOT galvanically isolated from each other (see MXR845CI Application Notes for further details). Use MXR845DI model for -5/0/+5V signal.
The unit is designed for mounting inside the switchboard panel or into a small cabinet with door access. When using the volt signal to the governor it is recommended to have short distance between MXR845x and governor due to possible noise problem. Shield cable is preferred. There is no practical restriction of distance when using the mA output signal, however screened cable is recommended.
Cables for connection should be minimum 0,5mm² multithreaded cable. Type of cable will depend on mounting environment and customer specifications.
Precision accuracy and stability within 0.5mV and 5μA increments, even during engine crank brown-out.
Isolated and fully protected outputs. Instant automatic reset gives full control of generator restart. Flame retardant enclosure (UL-94, V1 & V2).
Fit-and-forget reliability. Superiority to motorised potentiometers. No moving parts, no deterioration of performance.
POWER CAPACITY LIMITING FUNCTION
Span range can be set to limit output capacity of engine driven generators paralleled to a constant-frequency source (grid, shaft generator etc.). (See individual regulator interface on the application notes).
The use of the reset input or by removing the auxiliary supply allows the unit to be reset to a fixed point. When used on a generator this allows the engine to be reset to start on nominal speed after a stop. Reset input should be a pulse or a relay signal for engine stopped.
The voltage and milliamp outputs are NOT
galvanically isolated from each other. If both outputs are utilised then one must be galvanically isolated externally to the MXR845x.
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DIN Rail mounted, 55mm wide