HARDWARE MANUAL Document reference MAMPS-HW/E
VM600 machinery protection system (MPS) Edition 18 - March 2022
9-20
Connecting speed sensors
CONFIGURATION OF MPC4 / IOC4T CARDS
9.3 Connecting speed sensors
The IOC4T panel has four screw terminals for each of the two speed channels. These
terminals are as follows:
The MPC4 / IOC4T card pair can be used to power sensors having built-in or integrally
attached signal conditioners, providing the current requirement is ≤25 mA. In cases where
this built-in power supply capability is insufficient, an external power supply must be used.
Table 9-3 shows when this is necessary.
PS Power supply for transducer or signal conditioner.
HI
Differential input for the signal.
LO
SHIELD Terminal for connecting the shield of the transmission cable.
Table 9-3: Use of an internal (MPC4) or external power supply for
various types of speed sensors
Transducer and
signal conditioner
Output signal Rating Supplied by
Connection
diagram
Displacement probes used as speed sensors
TQ4xx + IQS45x
0 to −20 V −20 to −32 V MPC4 / IOC4T Figure 9-16
15 to 20 mA 25 mA max. MPC4 / IOC4T Figure 9-17
TQxxx + IQSxxx
with GSI127
0to−20V
−24 V
DC
±10%,
125 mA
External supply Figure 9-19
TQxxx + IQSxxx
with GSI124
0to−20V
−24 V
DC
±10%,
85 mA
External supply Figure 9-20
Note: According to API 670, the normal range is 0 to −22 V.
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