MTS Isolation Service Manifold Controller - Manual (Page 18)

Isolation Service Manifold Controller 18
J28A/B Connectors
Hardware Overview
J28A/B Connectors
Function
Channel A and B HSM output connector to provide connection from the ISM
controller HSM Low/High and proportional outputs to an HSM
Connector Type
Stacked D9S/D9S
Pin Outs/Electrical
specifications
LED A/B Indicators
Function
Used to convey fault information on ISM controller channels A and B.
1 flash repeating
One flash repeating can indicate:
• Isolation pressure Fault. Cause: ISM isolation pressure state does not match
the ISM isolation valve command state.
• Opens up J1 interlock out relays for 1 second and latches ISM control in an
interlock state.
Important Interlock relay must be wired to HSM controller interlock input to
signal the interlock to shut off the HSM controller outputs.
• Reset by an “off” to “on” transition of the HSM low output from an HSM
controller or by pressing the corresponding ISM controller “Fault Reset”
button. If the fault comes back after resetting, there is something wrong with
the isolation valve control/pressure monitoring, external to the ISM
controller.
Pin Description
4 HSM High Output.
HSM Hi command Output from a HSM controller
output to a HSM.
5 HSM Proportional Output.
HSM proportional command Output from a HSM
controller output to an HSM.
7 HSM Low Output.
HSM Low command Output from a HSM
controller output to a HSM.
8 HSM Low/Hi return.
Signal return path for HSM Low and Hi Outputs.
9 HSM Proportional return.
Signal return path for HSM proportional Output.
1, 2, 3, and 6 Not used.