Document reference MAMPS-HW/E HARDWARE MANUAL
Edition 18 - March 2022 VM600 machinery protection system (MPS)
5-13
AMC8 power-up sequence
AMC8 / IOC8T CARD PAIR
3- Sensor-Specific BIST
Depending on whether a thermocouple, RTD device, voltage-based sensor or
current-based sensor is connected, performs various tests such as:
• Current source checks
• Line checks (to monitor for broken lines)
• Line resistance mismatch (for 3-wire RTD measurements)
• Correct setting of jumper J805.
Errors detected by the BIST are used to set flags that can then be used by the VM600 MPSx
software to switch relays and so on.
5.10AMC8 power-up sequence
The AMC8 card's power-up sequence is initiated by either of the following events:
• The AMC8 being inserted into the ABE04x rack when the latter is powered up (that is,
the "live insertion" situation).
• Power being re-established after a power-down or a power failure.
5.10.1 Power-up after live insertion
A +5 V
DC
pre-charge supply is used to enable live insertion of AMC8 cards. This voltage is
supplied to the AMC8 from the system backplane. It is passed to the AMC8 module via three
pins on connector P1 (see Figure 3-3). These pins are slightly longer than the other VME bus
connector pins.
When a module is inserted into a MPS rack that is powered up, these longer pins make
contact first (typically 200 ms before the other pins). During this time, the +5 V
DC
pre-charge
supply is used to power up all the +5 V
DC
parts on the module. This ensures that when the
bus driver makes contact with the running VME bus, the circuitry is already at approximately
the correct voltage. In this way no glitches are produced on the VME bus power, address or
data pins.
Once the rest of the pins (including the standard +5 V
DC
supply) make contact, no further
power is drawn from the +5 V
DC
pre-charge supply.
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