AMETEK PLA-PLW - Manual (Page 29)

REMOTE INHIBIT (RI) & DRY CONTACTS ALARM PIN DEFINITION
In the case of fault conditions, the eLOAD provides an externally short-activated emergency shut-off port
(Remote Inhibit) that will disengage the eLOAD operation. For added protection, normal and deviant
conditions can be identified by the Dry Contacts Alarm, which utilizes Normal Open (RY_NO) and
Normal Close (RY_NC) relays as alarm indicators for customization of external protection systems. In the
case of a protection or AC power loss, the RY_NO will short (closed) and RY_NC will be opened to
indicate a fault/deviant condition, either contact can be used to trigger an external alarm.
1 2 3 4 5
Pin Number Pin Definition
1 – RI+ Remote Inhibited (RI) is used as an emergency switch to disable
the system. RI can be connecting to a switch or an open collector
device that shorts the RI pin to common (EGND) whenever it is
necessary to disable input of the unit. Once RI is activated, it
will turn off the dc output. In order to re-activate the unit, the
connection between common and RI pin needs to be open again,
and it will have 3 seconds delay.
2 – RI- The EGND return path for RI+ pin. Shorting RI+ and RI- (Pin 1
& Pin 2) will trigger RI protection.
3 – RY_NC Dry Contacts alarm: a fault alarm is declared if there is a loss of
AC power or protections are triggered. The fault alarm outputs
provide a normally closed relay configuration that provides
user’s flexibility and isolation required to an external controller
or an external alarm panel. The delay is 3 second
4 – RY_CO Relay Common. Provides the common (reference) connection
only for RY_NC or RY_NO
5 – RY_NO Dry Contacts alarm: a fault alarm is declared if there is a loss of
AC power or protections are triggered. The fault alarm outputs
provide a normally open relay configuration that provides user’s
flexibility and isolation required to an external controller or an
external alarm panel. The delay is 3 second.
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