Trane Starters Engineering Bulletin page 55

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When evaluating a power system for a chiller-compressor motor with a specified starter type,
calculations must be done in order to size or "correct" the power circuit properly in order to
successfully start the motor and keep the motor-starter combination online during operation.
Table 9
Table 9.
Starter Type
Wye-Delta
Solid-State
X-Line
Primary Reactor
Autotransformer
AFD
(a) The Chiller Controller Maximum Acceleration Time Setpoint is the maximum allowable acceleration time;
Table 10. Motor starter operational voltage range—during a start
Starter Size
155–606 amps
607–1,316 amps
607–1,856 amps
185–1,120 amps
180–960 amps
961–1,600 amps
155–1530 amps
94, 187, 205/288 amps
(205 reduced voltage, 288
full voltage)
94, 187, 360 amps
94 amps
61–250 amps @ 4,160 V
Note: The maximum allowable under/overvoltage during normal operation is ±10 percent.
CTV-PRB004-EN
Additional (non-chiller) loads on the power circuit
and Table 10, p. 55 show specific starter characteristics and minimum power requirements.
Sizing requirements
Voltage Range
208–600 V
208–600 V
2.3–13.8 kV
2.3–13.8 kV
2.3–13.8 kV
460–600 V
if the chiller has not started within this time, a diagnostic will be set.
Starter Description
Unit- and Remote-Mounted
Wye-Delta
Unit-Mounted
Wye-Delta
Remote-Mounted
Wye-Delta
Unit- and Remote-Mounted
Solid-State
Remote-Mounted,
High-Fault Solid-State
Remote-Mounted,
High-Fault Wye-Delta
Unit- and Remote-Mounted
Low Voltage AFD
(460–600 V)
Unit-Mounted
Medium Voltage
(2.3–6.6 kV)
Remote-Mounted
Medium Voltage
(2.3–6.6 kV)
Remote-Mounted
Medium Voltage
(10–13.8 kV)
Remote Medium-Voltage AFD
Electrical System—Design Guidelines
Inrush Chiller Controller
Current Maximum Acceleration
% LRA Time Setpoint (sec)
33 27
~45 27
100 6
65 16
45 16
<13 12
Maximum
Line-to-Line
RMS Voltage Sag
25%
25%
20%
25%
25%
25%
25%
25%
(20% w/additional
protection)
25%
(20% w/additional
protection)
25%
(20% w/additional
protection)
25%
Percent
Rated
(a)
Torque
33
33
100
42
42
Varies
Maximum
Line-to-Line
RMS Voltage Swell
15%
15%
15%
15%
15%
15%
10%
15%
15%
15%
10%
55