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Group
A
trip
indicator
-
Group
A
trip
temperature
set
switches
Group
B
trip
indicator
I
Group
B
trip
temperature
set
switches--
Group
C
trip
indicator
Group
C
trip
temperature
set
switches-
I
Temperature
set
point
mode
selection
switches
The
Model
RTM20
temperature
control
relay
has
eight
different
channels,
each
of
which
is
devoted
to
a
separate
RTD
.
There
are
two
ways,
or
modes,
of
using
the
eight
channels
.
In
mode
1,
six
channels
(RTD's)
can
be
set
at
one
trip
temperature
and
the
other
two
Table
1
Trip
Temperature
Channels
-Temperature
indicator
Power
ON
and
OFF
indicator
Sensor
disconnection
or
burnout
indicator
Temperature
indicator set
switch
Manual
reset
switch
RTD
selection
switches
Reset
mode
selection
switch
(manual
or
automatic)
can be
set
at
another
trip
temperature
.
In
mode
2,
three
channels
can
be
set
at
one
trip
temperature,
two
at
a
second
trip
temperature
and
three
at
a
third
trip
temperature
.
In
each
mode,
eight
different
places
can
be
monitored
.
Channel
Mode
1
2
T
3T4
5 6 7 8
1
Trip
temperature
A
Trip
temp
.
B
2
Trip
temp
.
Trip
temp
.
Trip
temp
.
A B
C