Control Power Transformer; Current Transformers, Cts - Trane Symbio CVRF Installation Instructions Manual

Starter Work
• 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
Table 9. CT specifications for single transformer per phase
Actual Motor
RLA (A) CT Part Number
67-100 TRR02028
100-150 TRR00715
134-200 TRR02029
184-275 TRR02030
267-400 TRR02031
334-500 TRR01142
467-700 TRR01255
40
CT Ratio (A:A) CT Rating (A)
40:00.1 100
30:00.1 150
20:00.1 200
35:00.1 275
40:00.1 400
20:00.1 500
40:00.1 700
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
DIM "B"
DIM "A"
Polarity Dot
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.
(a)
Diameter (inches)
Inside A Inside B
2 3.35
2 3.35
2 3.35
2 3.35
2.5 3.95
2.5 3.95
2.5 3.95
Schematic
1/4 in. male quick connect
2 places
Primary CT Meter
Turns Scale
1 100
1 150
1 200
1 275
1 400
1 500
1 700
CVRF-SVN005C-EN