Starter Work
40
CVRF-SVN005C-EN
•
To simplify future chiller trouble analysis, Trane
recommends removing all existing, non-essential
components from the starter panel enclosure.
Control Power Transformer
If the existing starter does not have 115 Vac 3 kVA of additional
control power, install a transformer (fieldsupplied) that will
provide 115 Vac to the Symbio™ control panel. (As just
described, transformer requirements are: line voltage primary/
115 Vac secondary, minimum capacity 3 kVA.)
Current Transformers, CTs
WARNING
Hazardous Voltage w/Capacitors!
Failure to disconnect power and discharge capacitors
before servicing could result in death or serious injury.
Disconnect all electric power, including remote
disconnects and discharge all motor start/run
capacitors before servicing. Follow proper lockout/
tagout procedures to ensure the power cannot be
inadvertently energized. For variable frequency drives
or other energy storing components provided by Trane
or others, refer to the appropriate manufacturer’s
literature for allowable waiting periods for discharge of
capacitors. Verify with a CAT III or IV voltmeter rated per
NFPA 70E that all capacitors have discharged.
WARNING
PPE for Arc/Flash Required!
Failure to wear appropriate PPE could result in death or
serious injury. On this unit, if the handle shield is
cracked the circuit breaker could arc/flash when reset.
To avoid being injured, technicians MUST put on all
necessary Personal Protective Equipment (PPE), in
accordance with NFPA70E for arc/flash protection,
PRIOR to entering the starter panel cabinet.
Three new current transformers CTs (“donut” shape) are
optional to re-work the starter. If used, install these three new
CTs as shown on wiring diagram. Pay careful attention to the
polarity dot and its orientation. The polarity dot should face
incoming power, in other words, towards the disconnect.
Figure 55. Current transformer, single turn-down
Wire the leads from the CT male quick connects to the starter
module as shown on the wiring diagram. Use female insulated
quick connect terminals.
The application of Symbio™ chiller controls to a medium
voltage chiller recommends specific use of the dual current
transformer (CT) application, rather than a single CT which is
a common option on low voltage applications (600 Vac or less).
Refer to CVRD-SVN11*-EN for wiring of medium voltage CT
applications.
The dual CT installation uses a primary CT that reduces the
amperage to less than 5 amps. A second CT is then used to
reduce the current input to the starter module to a nominal 100
mA value. Use dual CT data tables in the startup and
programming manual CVRE-SVP01A-EN, or the latest
version.
It is recommended that you confirm the correct CT has been
provided before starting installation. Before wiring the starter
module and CT be sure to confirm incoming power phasing. If
Phase A, B, and C are wired in the wrong order the controls will
not allow the motor to start. Use the phase meter on the low
voltage side of the potential transformer. Do NOT use the
meter on the primary side where there is medium voltage
because it probably exceeds the safe operating voltage range
of most service meters.
1/4 in. male quick connect
2 places
Polarity Dot
DIM “B”
DIM “A”
Schematic
Table 9.
CT specifications for single transformer per phase
Actual Motor
RLA (A)
CT Part Number
CT Ratio (A:A)
CT Rating (A)
Diameter
(a)
(inches)
Primary
Turns
CT Meter
Scale
Inside A
Inside B
67-100
TRR02028
40:00.1
100
2
3.35
1
100
100-150
TRR00715
30:00.1
150
2
3.35
1
150
134-200
TRR02029
20:00.1
200
2
3.35
1
200
184-275
TRR02030
35:00.1
275
2
3.35
1
275
267-400
TRR02031
40:00.1
400
2.5
3.95
1
400
334-500
TRR01142
20:00.1
500
2.5
3.95
1
500
467-700
TRR01255
40:00.1
700
2.5
3.95
1
700
