Operation
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IOM 1274-3 • CENTRIFUGAL WATER CHILLERS
Figure 55: Settings View - Motor
Table 15: Motor Setpoints
Description
Default
Range
PW
Comments
Nominal Capacity
100 tons
0-2000 tons
T
Sets nominal capacity rating of an individual compressor for staging decisions.
Oil No Start Differential
40.0 °F
30 TO 60 °F
M
Compressor Start: Sets minimum delta between oil sump temp and evaporator
saturated temp. Oil Heat Control: Sets ON control point @ evaporator LWT +
Se 10F or Sets OFF control point @ evaporator LWT + Se 20F
Soft Load Enable
Off
Off, On
M
Initial Soft Load Limit
40%
10 TO 100%
M
Initial %RLA for soft load ramp up
Soft Load Ramp Time
5 min
1 TO 60 min
M
Time period for up to 100% from limit
Show Motor Temps
No
No, Yes
T
Setting for displaying motor temps on HMI screen
Max Leaving Water Temp Rate
0.5 °F/min
0.1 to 5.0 °F/min
M
Sets LWT rate above which capacity increase is inhibited
Min Leaving Water Temp Rate
0.1 °F/min
0.1 to 5.0 °F/min
M
Sets value below which an additional compressor can stage on.
Demand Limit Enable
OFF
ON, OFF
M
ON: Limits %RLA to a value set by the Demand Limit analog input,
where: 4 mA = 70 %RLA
20 mA = 100 %RLA
OFF: The Demand Limit input is ignored.
Minimum Amps
39%
5 to 80%
M
Sets %RLA below which unloading is inhibited
Maximum Amps
100%
10 to 100%
M
Sets %RLA above which capacity increase is inhibited. Unloading is forced at 5%
above this value.
VFD Enable
No
Yes
M
Sets if the motor is controlled by a VFD
VFD Speed Offset
10%
0 to 20%
M
VFD Minimum Speed
55%
0 to 100%
M
Minimum that can be set is VFD Low Speed Limit
VFD Speed
10%
0 to 100%
M
Sets speed portion of Speed/Lift ratio setpoint where Speed is at 0 Lift.
Lift
90 °F
30 to 90 °F
M
Sets lift portion of Speed/Lift ratio setpoint where Lift is at 100% Speed.
Protocol Starter
Local
Local, Remote,
MODBUS, D3, MX3,
Iso-Mtr-T MX_MV
T
Communication protocol with compressor starters
Ident Number Starter
1
0-200
T
Identification numbers for starters
Baud Rate Starter
19200
1200, 2400, 48, 00,
9600, 19200
T
