HARDWARE MANUAL Document reference MAMPS-HW/E
VM600 machinery protection system (MPS) Edition 18 - March 2022
4-12
Inputs and outputs
MPC4 / IOC4T CARD PAIR
4.4.3 Analog outputs
The MPC4 and IOC4T card pair provides a buffered transducer “raw” output for each of its
four dynamic signal inputs and the two tachometer (speed) inputs.
For the dynamic signal inputs, each buffered output is an analog signal that is a replica of the
transducer input signal for the channel including both AC and DC components (single-ended,
referenced to ground).
The transfer ratio for the buffered outputs of dynamic channels depends on the configured
signal transmission mode for the input:
• For a voltage input, the transfer ratio is 1 V/V.
That is, with a dynamic channel configured for a voltage input, the signal level
(amplitude) of the buffered output is the same as the input signal from the transducers.
• For a current input, the transfer ratio is 0.3245 V/mA.
That is, with a dynamic channel configured for a current input, the signal level (amplitude)
of the buffered output is a product of the transmitted current and the current measuring
resistor (324.5 Ω) at the dynamic signal input.
For the dynamic signal inputs, the buffered outputs are available on BNC connectors on the
MPC4 card (see 4.4.3.1 Front panel analog outputs (MPC4)) and on screw-terminal
connectors on the IOC4T card (see 4.4.3.2 Rear panel analog outputs (IOC4T)).
For the tachometer (speed) signal inputs, each buffered output is a digital signal that is a
level-shifted replica of the transducer input signal for the channel (single-ended, referenced
to ground).
For a speed channel, the signal level (amplitude) of the buffered output is a 0 to 5 V
TTL-compatible signal.
For the speed signal inputs, the buffered outputs are available on BNC connectors on the
MPC4 card (see 4.4.3.1 Front panel analog outputs (MPC4)).
NOTE: All of the analog outputs are buffered and can support short-circuits or input pulses
without internal interference.
4.4.3.1 Front panel analog outputs (MPC4)
The MPC4 panel is equipped with 6 BNC connectors, intended for the connection of
laboratory instruments:
• Four connectors for raw dynamic signals (AC and DC, if applicable).
These are named RAW OUT 1, RAW OUT 2, RAW OUT 3 and RAW OUT 4.
• Two connectors for processed speed outputs (TTL format).
These are named TACHO OUT 1 and TACHO OUT 2.
4.4.3.2 Rear panel analog outputs (IOC4T)
Buffered raw signals from the sensors (for example, corresponding to vibration) are available
for connection to external racks or other equipment for further analysis such as condition
monitoring.
These differential outputs (RAW 1H and RAW 1L, RAW 2H and RAW 2L, RAW 3H and
RAW 3L, and RAW 4H and RAW 4L) are accessible on the IOC4T card.
The same bandwidth and accuracy specifications apply as per the BNC outputs on the MPC4
panel.
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