66 OMM 1008-1
SET COMP#N (7)
WMC Automatic
Vane Control
(blank menu)
Ignore this menu on Magnitude
chillers.
SET COMP#N (8)
MAX KW = 076.0
Lag Start = 000Sec
Step Down = 060Sec
Staging Parameters
Full Load Determination
Each compressor determines if it is at its maximum capacity (or maximum allowed capacity) and, if so, set its
Full Load flag. The flag advises other components that the compressor is fully loaded. The flag is set (full
load) when one or more of the following conditions are met.
•
The compressor is at its physical limit of capacity which means:
For VFD Set Point = NO: The load output has been pulsed ON for a cummulative time equal to or greater
than the Full Load set point (menu #4). Any unload pulse will reset the cumulative time to zero.
For VFD Set Point = YES: Load pulsing has exceeded the Full Load set point (as described above) AND the
VFD speed = 100%
OR
The Vanes Open digital input is On AND the VFD speed = 100%.
•
The % RLA is above or equals the Maximum Amp limit set point.
•
The % RLA is above or equals the Demand Limit analog input value
•
The % RLA is above or equals the Network Limit value
•
The evaporator pressure is below the Low Evap Pressure-Inhibit set point.
When none of the above conditions are met, the Full Load flag is cleared.
Absolute Capacity
Each compressor estimates its absolute capacity from the present value of %RLA and the Absolute Capacity
set point from the equation:
Absolute Capacity = (% RLA Factor) * (Absolute Capacity set point)
Where the % RLA Factor is interpolated from the following table.
% RLA 0 50 75 100 150
% RLA Factor 0 0.35 0.75 1.00 1.50
SET COMP#N (9)
Protocol =M-BUS MSTR
Ident Number= 001
Baud Rate = 19200
To Next Page
Loading...
