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Note
The cable runs to J2 on the recorder
PCB Wires are connected top to bot-
tom as White(NC), Black (COM),
and Red (NO).
Caution
Damage to the recording unit may
result if the ratings for the relays are
exceeded.
Note
The recorder alarms will activate
when the recorder temperature is
outside the high and low alarm
points explained above. Do not acti-
vate the alarm until the temperature
inside the equipment is between the
adjustable limits.
C
R
HART
ECORDER
The relays that are used in this recording unit are latching
type relays. That is the contacts of the relay will remain
either closed or open (even when there is no power
applied to the recorder) until the relay is pulsed with a sig-
nal from the recorder to change the position of the con-
tacts.
Alarm contacts are available through a 3-conductor cable
on the back of the recorder. Due to the many models the
recorder is installed, the details of removing the panel is
not included here. A visual inspection should define sev-
eral screws to remove first. Models which the screws are
removed and the panel does not come loose, carefully
push up about 1/2" and release keyhole type screws. The
black wire is the common. The red wire is the normally
open side of the relay contact. The white wire is the nor-
mally closed side of the relay contact.
The relays are rated for the following maximum values:
2.0 AMP at 30 V DC
0.6 AMP at 30V AC
Setting the Alarms
To set the alarms, follow these instructions:
Press and hold the "chart change" button (#3) until the
pen arm begins to move off of the chart and then release
the button. Wait until the pen has moved completely off of
the chart. When the "chart change" button (#3) is pressed
again, the pen will begin to move back onto the chart
briefly stopping at the edge of the chart. (Verify the pen is
on the edge of the chart.)
The pen arm will then move to the first control point posi-
tion and the green LED will turn off. The pen will remain
at this position for a period of approximately five seconds
during which time high-alarm point can be adjusted using
the left arrow (#1) or the right arrow (#2) push buttons.
Refer to Figure 6 for a diagram of the pushbuttons. When
the time has expired for adjusting the high alarm point,
the green LED will turn back on and move to the low
alarm point. The pen will remain at this position for a
period of approximately five seconds during which time
the low alarm point can be adjusted using the left arrow
(#1) or the right arrow (#2) push buttons. The LED will
turn solid green and the pen arm will move to indicate the
probe's temperature and the unit will begin recording.
O
M
PERATION AND
AINTENANCE
19
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