Metacentre CX Box
Page 25
Used for optional ‘Speed Monitoring Kit’ (if
fitted). Intended for monitoring the frequency
output (speed) of an inverter drive variable
speed type compressor.
When enabled the ‘User’ menu %Speed value
will be the detected speed determined by the
‘Speed Monitoring Kit’.
S%
Minimum
%Speed
Set to match the minimum speed, or output, of
the compressor in comparison with the
maximum speed, or output.
For example:
If the minimum speed is 40% of the maximum
speed (sometimes expressed as 60% turn-
down), set the S% value to 40%. This value is
used to calculate and display the %Speed, or
%Output, value.
FL
Frequency at Minimum Speed
The inverter drive output frequency at the
compressor’s minimum operating speed. By
restricting the output air from the compressor
the compressor inverter drive can be forced to
minimum speed. Set the value to the lowest
frequency detected.
The detected frequency and %Speed values
are shown for reference.
The frequency setting must represent the
lowest inverter drive output frequency that will
occur in normal operation.
FL
Frequency at Maximum Speed
The inverter drive output frequency at the
compressor’s maximum operating speed.
By creating a demand for air the compressor
inverter drive can be forced to maximum
speed. Set the value to the highest frequency
detected.
The detected frequency and %Speed values
are shown for reference.
The frequency setting must represent the
maximum (100%) inverter drive output
frequency that will occur in normal operation.
C01
01 RC
0
02 AC
0
03 VC
%
0
%
%
Regulation control settings:
Regulation
Mode
L
ignore RC, AC and VC
AR
set RC and AC; ignore VC
3S
set RC; ignore AC and VC
5S
set RC; ignore AC and VC
V
set RC and VC; ignore AC
RC
Regulation Control
C01
01.01
RC
CP:
OP:
0%
0%
P:
I:
40
10
CP and OP are view only.
The ‘RC’ set-up menu determines the
response of the internal ‘control percentage’
(CP) value to changes in detected ‘Delivery’
pressure (Pd).
The ‘control percentage’ value is determined
from a P&I algorithm using the detected
‘Delivery’ pressure (Pd) as input. The value
will increase towards 100% as pressure
deceases below the set ‘PL’ (lower pressure)
set point and will decrease towards 0% as
pressure increases above the set ‘PL’ set
point.
