OMM WCT
Centrifugal Chillers
D-EOMWC01302-16EN - 34/84
MOTOR Setpoint Screen
Figure 21, MOTOR Setpoint Screen
Table 13, MOTOR Setpoint Settings
Description
Default
Range
Pass-
word
Comments
Demand Limit Enable
OFF
OFF, ON
O
ON sets %RLA at 0% for 4 mA external signal and at
100% RLA for 20 mA signal
Minimum Amps
40%
20 to 80%
T
% RLA below which unloading is inhibited
Maximum Amps
100%
40 to 100%
T
% RLA above which loading is inhibited (Load Limit)
Nameplate RLA
Not used on WSC/WDC models
Soft Load Enable
OFF
OFF, ON
M
Soft load on or off
Initial Soft Load Amp
Limit
40%
20 to 100%
M
Initial amps as % of RLA
Soft Load Ramp
5 min
1 to 60 min
M
Time period to go from initial load point (% RLA) set in
SP 5 to 100% RLA
Minimum Rate
0.1
F/min
0.0 to 5.0
F/min
M
Additional compressor can start if LWT change is below
setpoint.
Maximum Rate
0.5
F/min
0.1 to 5.0
F/min
M
Inhibits loading if LWT change exceed the setpoint
value.
Nominal Capacity
0 to 9999 Tons
Determines when to shut off a compressor
Oil No Start Diff
(above Evap Temp)
40
F
30 to 60
F
T
Minimum Delta-T between oil sump temperature and
saturated evaporator temperature
VFD
No
No, Yes
T
VFD on unit or not
Minimum Speed
70%
60 to 100%
T
Min VFD speed, has priority over Speed @ 0 Lift & Lift
@ 100 % Speen
Speed @ 0 Lift
50%
0 to 100%
T
Lift @ min speed as a % of 100 % lift
Lift @ 100% Speed
40
F
30 to 60
F
T
Temp lift at 100 % speed (cond sat
– evap sat temp)
