McQuay WSC Operating Manual page 34

MOTOR Setpoint Screen
Figure 19, MOTOR Setpoint Screen
Table 17, MOTOR Setpoint Settings
Description
Lift @ 100% Speed
Speed @ 0 Lift
Minimum Speed
VFD
Oil No Start Diff
(above Evap Temp)
Nominal Capacity
Maximum Rate
Minimum Rate
Soft Load Ramp
Initial Soft Load Amp
Limit
Soft Load Enable
Nameplate RLA
Maximum Amps
Minimum Amps
Demand Limit Enable
34
No. Default Range
15
40 °F 30 to 60 °F
14 50% 0 to 100%
13 70% 60 to 100%
12 No No, Yes
11
40 °F 30 to 60 °F
10 0 to 9999 Tons
0.5 0.1 to 5.0
9
°F/min °F/min
0.1 0.0 to 5.0
8
°F/min °F/min
7 5 min 1 to 60 min
6 40% 20 to 100%
5 OFF OFF, ON
4
3 100% 40 to 100%
2 40% 20 to 80%
1 OFF OFF, ON
Pass-
word
T Temp lift at 100 % speed (cond sat – evap sat temp)
T Lift @ min speed as a % of 100 % lift
T Min VFD speed, has priority over SPs 11 & 12
T VFD on unit or not
Minimum Delta-T between oil sump temperature
T
and saturated evaporator temperature
Determines when to shut off a compressor
Inhibits loading if LWT change exceed the setpoint
M
value.
Additional compressor can start if LWT change is
M
below setpoint.
Time period to go from initial load point (% RLA) set
M
in SP 5 to 100% RLA
M Initial amps as % of RLA
M Soft load on or off
Not used on WSC/WDC models
T % RLA above which loading is inhibited (Load Limit)
T % RLA below which unloading is inhibited
ON sets %RLA at 0% for 4 mA external signal and
O
at 100% RLA for 20 mA signal
Comments
OM Centrif Micro ΙΙ-5