MUC IOM
24
|
P a g e
Operation - Flow Chart
Enable Input
24 VDC
Running
Gas Relay
closed
Alarm
Gas Relay open
Green
LED
Red
LED
Prover input
24 VDC
Motor status signal
> 4 VDC
Motor running
Frequency input
≥ 150 HZ
-------------------------
If By-pass jumper
is in the “on”
position this
function is ignored
by MUC and runs
normally without
motor RPM
frequency
feedback
Enable input energized and
Pot output is ≥ 2.0 VDC
Potentiometer
0-10 VDC Out
Standby
no outputs
LED
OFF
NO
Pot. output
< 1.5 VDC
Enable input
not energized
Control Enabled
YES
YES
Gas Relay opens,
alarm function
disabled and post
purge timer begins
60 sec “off” delay
Timer expired
NO
Gas Relay and
alarm “on” delay
15 seconds
Analog 0-10
VDC output
set to pot.
VDC
Damper
Relay
closed
Green
LED
Timer counting
Are status inputs in
range?
NO
YES
Buzzer
