Thermon TraceNet TCM 18 User Manual

Page 40

PROG plus
CONFIG

Having completed selections on the first display
screen, the flashing cursor will move to the second
display screen. This second display screen allows the
programming of the TCM18 alarm relay configuration
options (“ALARM RLY ALL ALARMS” or “ALARM RLY
TEMP ONLY”). This allows the user to either activate
the alarm relay on any alarm event occurring on this
TCM18 or only when a temperature alarm occurs on
the TCM18. The resulting alarm relay action allows
the operator to provide a visual or sound indication or
notify the DCS (depending how the panel is equipped)
of an alarm event In addition, the ALARM LED on the
front panel always activates during any alarm event.
Press the UP or DOWN arrow keys to select a new
option and press ENTER to accept.

The flashing

cursor now moves to the next line where the process
may be repeated.

This second display screen also allows the program-
ming of the TCM18 to designate the relay alarm action
as “ALARM RLY NRM CLOSED” or “ALARM RLY NRM
OPEN”. A normally closed relay is of the Form B type
and will open on an alarm event. Relays of this conven-
tion are quite often used when contacts are connected
to a DCS system or other type of smart monitoring
device. An advantage of this alarm relay type is that it
also naturally creates an alarm if the controller/system
unexpectedly loses power. A normally open relay is
of the Form A type and will close on an alarm event.
This relay convention is often used when there is light
or some warning device like a horn connected to the
alarm relay contacts.

Press the UP or DOWN arrow keys to select a new op-
tion and press ENTER to accept.

PN 50316_0514