10 Water Level Control
Mk8 MM Manual Page | 202
inputs detected simultaneously
• Check wiring on terminals HAI, 1AI and 2AI
Probes/ sensor detects 1
st
or 2
nd
low and
high water simultaneously
• Check water level readings for probes and sensor if optioned
• Re-commission probes/sensor
Permanent Alarm Reset Input
Input held on alarm reset terminal for more
than 10 seconds
• Check input on terminal M/R
Second Low Probe Communications
Fault
No comms with second low probe
• Check wiring and screen on terminals 5T+, 5T-, 4P- and 4P+
Second Low Probe Hardware Fault
• Contact Autoflame approved local tech centre
Input held on test terminal for more than 60
seconds
• Check input on terminal TST
Second Low Probe Detected but Not
Optioned
Second low probe connected but not
optioned
• Check expansion option 6
• Check wiring on terminals 5T+, 5T-, 4P- and 4P+
Aux WL Inputs Detect but Not
Optioned
Mains detected on auxiliary WL inputs but
not optioned
• Check expansion option 5
• Check wiring on terminals HAI, 1AI and 2AI
ng - exp.
Feed Water Servo Position Error
Servomotor is outside of the commissioned
range
• Check wiring on terminals P-, FW and P+
• Check signal cable form the MM to the servomotor is screened at one end
• Check that the servomotor is zeroed correctly
ng - exp.
Feed Water Servo Movement Error
Servomotor moves when not expected and
vice versa
• Check wiring and voltages on terminals MVI and MVD
• Check servomotor drives in correct direction
• Check feed water valve is not stuck
ng -exp.
Probes/sensor detect water level above
commissioned high water
• Check water level reading
Probes/sensor detect water level above set
pre-high water
• Check water level reading
• Check expansion option 7
Probes/sensor detect water level below set
pre-1
st
• Check water level reading
• Check expansion option 8
Probes/sensor detect water level below
commissioned 1
st
• Check water level reading
• 1
st
low alarm will automatically clear if water level increases above 1
st
low
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