Metacentre CX Box
Page 35
FH
Fault High Level Set Point
If ‘Value’ exceeds this setting the ‘Fault
Function’ (Fn) is triggered.
The setting must be referenced to the same
value, or resulting value, units as the set ‘Vo’
and ‘Vr’ settings.
For example:
If the analogue input is Temperature the
‘Value’ will be
o
C x 10. If a fault condition
needs to be triggered when temperature
exceeds 85
o
C the FH level should be set to
850 (850 / 10 = 85
o
C).
If not required set to, or above, the ‘Vr’ setting.
FL
Fault Low Level Set Point
If ‘Value’ decreases below this setting the
‘Fault Function’ (Fn) is triggered.
The setting must be referenced to the same
value, or resulting value, units as the set ‘Vo’
and ‘Vr’ settings.
For example:
If the analogue input is Temperature the
‘Value’ will be
o
C x 10. If a fault condition
needs to be triggered when temperature
reduces below -10
o
C (minus 10
o
C) the FL
level should be set to -100 (-100 / 10 = -10
o
C).
If not required set to, or below, the ‘Vr’ setting.
Fn Fault
Function
If ‘Value’ reduces below the set ‘FL’ level or
increases above the set ‘FH’ level the fault
function is triggered:
“-“
no
action
A
Alarm
(Warning)
T
Shutdown
Trip
In the event of a Shutdown Trip the
compressor will be held offload and become
unavailable to the management system.
DT
Fault Delay Time
When the conditions for a fault become active
(FH, FL and Fn) the fault condition must
remain for longer than the set delay time ‘DT’
(seconds) before the fault actually becomes
active and is displayed as a fault condition.
Set ‘DT’ = 0(zero) for immediate fault
detection.
