KMC Controls SAE-1162 - Manual (Page 3)

SAE-1111/1112/1162 Carbon Monoxide (CO) Detectors 3 Installation Guide
Operation
Warm-Up Mode
1. Verify that the detector is properly wired and all
connections are tight.
2. Apply power.
The LCD display briefly indicates the software ver-
sion number and begins a warm-up period of about
2 minutes. During the warm-up, the alarm beeps
three times, the LED flashes red, the signal output
is fixed at 4 mA or 0 VDC, and the relays are off.
After the warm-up period ends, the sensor reads
the CO level, outputs the correct analog signal, and
displays the value on the LCD.
Normal Mode
In normal operation, the sensor will measure the CO
level and output a proportional value on the analog
output, which is scaled to the default range of 0–300
ppm. The CO reading will also be displayed on the
LCD. If alarm relays are installed, the present CO
reading is compared to the setpoints and appropriate
action is taken if an alarm condition exists. The status
LED on the front cover will be green to indicate nor-
mal operation.
Alarm Mode
Automatic Alarm Reset (Default)
The CO reading is compared to setpoints for alarms,
and if exceeded, the device enters Alarm mode.
For models with optional alarm relays installed
(see Models on page 9 ), the trip point, hysteresis
(deadband), and delay time of each relay can be
programmed via the menu. For example, Relay 1
defaults to a 50 ppm trip point, 10 ppm hysteresis,
NOTE: The sets of optional (form “C”) relays feature
Normally Open (NO), Normally Closed
(NC), and Common (COM) terminals. The
relay output is completely isolated. The
COM terminal is NOT connected to the
signal or power supply COMMON terminal.
(The contacts are rated at 5 A @ 250 VAC, 5 A
@ 30 VDC, power factor = 1.)
NOTE: Pressing the TEST button (when enabled)
tests the buzzer, analog output, and relays.
The Test function may also be initiated re-
motely by shorting the TEST + and TEST –
terminals. (The TEST – terminal is internally
connected to the Analog COM terminal, and
if desired, only one wire need be connected
to the TEST + terminal if the power supply
COM is used as the return signal path.) The
TEST terminals should only be connected to
a remote switch or dry-contact.
and 2 minute delay time. Relay 2 defaults to a 150
ppm trip point, 20 ppm hysteresis, and 2 minute
delay time All of these values can be changed via the
menu. In the example for Relay 1, a timer is started
when the CO level exceeds 50 ppm (the trip level). If
the level drops below 50 ppm before 2 minutes (the
delay time) has expired, then the relay is not acti-
vated. If the CO level exceeds 50 ppm for 2 minutes,
then the relay is activated. The relay will remain
activated until the CO level drops below 40 ppm
(the trip level minus the hysteresis/deadband). This
relay could be used to signal a “low alarm.” Relay 2
operates in the same manner and has independently
programmable trip point, hysteresis, and delay time.
This relay could be used to signal a “high alarm.”
The LCD will indicate the Alarm mode details, and
the LED will flash red.
The buzzer alarm is enabled by default with a 150
ppm trip point and 5 minute delay time. It can be
programmed similarly to the relays. When the trip
point is exceeded for a time longer than the delay
time, the buzzer will sound until the CO level falls
below the trip point. The buzzer operates indepen-
dently of the relay alarms and can be disabled via
the menu. If enabled, pressing the TEST button
will silence the buzzer (only) during Alarm mode.
Buzzer silence will hold only until that alarm condi-
tion is cleared.
Manual Alarm Reset
For this option, the alarm relays will activate the
same way as described above but will not automati-
cally reset to Normal Mode when the CO level drops
below the trip level. In order to reset the relay alarms
to Normal Mode, the user must also press the TEST
CAUTION
Ensure no power is applied to the TEST terminals.