User guide

Rev. 5 149
Appendix
Quench I/O Connector
electrically coupled. This can be accomplished through the rack
mounting or by using a grounding strap between the chassis.
A.5 Quench I/O Connector
The Quench I/O connector provides pins for external quench detection
input, quench detection output, and external rampdown input. The shell
lugs of the connector are connected to the Model 430 Programmer chassis
ground. The Quench I/O connector is a 9-pin D-sub female connector.
A.5.1 External Quench Detection Input
The external quench detection input allows the user to facilitate his own
quench detection circuitry, the output of which is wired to the Model 430
Programmer. The external input overrides the internal quench detection
function of the Model 430 Programmer and cannot be disabled.
Caution
The external quench detection input is a dry contact input, not
galvanically isolated from the Model 430 Programmer internal
circuitry. To avoid noise problems and potential damage to the
Model 430 Programmer, it is very important that the dry contacts to
Table A-4. Quench I/O Connector Pin Definitions
Pin Polarity Function
1
n/a
Quench Output
(Model 430 Programmer NO dry contact)
2
3 not used
4 circuit common
Quench Input
(customer-suppled external NO dry contact)
5+
6 circuit common
Rampdown Input
(customer-supplied external NO dry contact)
7 +
8
not used
9