HARDWARE MANUAL Document reference MAMPS-HW/E
VM600 machinery protection system (MPS) Edition 18 - March 2022
9-24
Connecting speed sensors
CONFIGURATION OF MPC4 / IOC4T CARDS
9.3.2.2 Current-modulated signal
Applies to the following transducers or transducer and signal conditioner systems:
• TQ4xx + IQS45x.
Notes
1- Switch Sw1 is closed to allow current-modulated signals to be processed.
For non-vibro-meter devices, the Signal Transmission Mode field has to be set to the
Current option.
2- The sensor power supply is always set to −27.2 V.
NOTE: For speed/phase reference input channels, it can be more difficult to achieve the
minimum input voltage required when current is selected as the signal
transmission mode. Therefore, the 200 Ω current-to-voltage conversion resistor
used by the MPC4 card for current-modulated input signals should be used in any
system design calculations in order to ensure reliable detection.
Figure 9-17: Connection diagram
Sensor
power
supply
SPEED
INPUT
(−27.2 V only)
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