RXT Transfer Switch Manual

TP-6807 1/16 23Section 2 Installation
2.7.4 Current Transformers (CTs)
A current transformer is required for load management.
A 400 amp current transformer is included with the
combined interface /load management board. If the
application r equires cables that are too large for the
inside diameter of the CT provided, or a 500 Amp CT is
needed for the 60RCL, order a current transformer or
obtain a current transformer that meets the
specifications shown in Figure 2-14.
Standard
CT
(included)
Larger
Diameter CT*
(sold
separately)
500 Amp CT[
(sold
separately)
Kit Number GM83929 GM17250-KP1-QS GM17250-KP2-QS
CT Service Part
Number
GM83929 GM17250 GM60264
Primary Rating 400 Amps 400 Amps 500 Amps
Secondary
Rating
3VAC 3VAC 3VAC
Burden
Resistor
16 Ohms 16 Ohms 16 Ohms
Burden
Resistor
Location
Internal Internal Internal
Outer Diameter
(O.D.)
63.5 mm
(2.50 in.)
111.8 mm
(4.40 in.)
171.5 mm
(6.75 in.)
Inner Diameter
(I.D.)
28.7 mm
(1.13 in.)*
57.2 mm
(2.25 in.)
108.0 mm
(4.25 in.)
* Order GM17250--KP1--QS for applications that use larger cables.
[ Order GM17250--KP2--QS for 60RCL only.
Figure 2-14 Current Transformer (CT) Specifications
2.7.5 Connection Procedure
Accidental starting.
Can cause severe injury or death.
Disconnect the battery cables before
working on the generator set.
Remove the negative (--) lead first
when disconnecting the battery.
Reconnect the negative (--) lead last
when reconnecting the battery.
WARNING
Disabling the generator set. Accidental starting can
cause severe injury or death. Before working on the
generator set or equipment connected to the set, disable the
generator set as follows: (1) Press the generator set off/reset
button to shut down the generator set. (2) Disconnect the
power to the battery charger, if equipped. (3) Remove the
battery cables, negative (--) lead first. Reconnect the negative
(--) lead last when reconnecting the battery. Follow these
precautions to prevent the starting of the generator set by the
remote start/stop switch.
Hazardous voltage.
Will cause severe injury or death.
Disconnect all power sources before
opening the enclosure.
DANGER
Making line or auxiliary connections. Hazardous voltage
can cause severe injury or death. To prevent electrical
shock deenergize the normal power source before making any
line or auxiliary connections.
1. Press the OFF button on the generator set
controller.
2. Disconnect the utility power to the generator set.
3. Disconnect the generator set engine starting
battery(ies), negative (--) lead first.
4. Disconnect power to the transfer switch.
5. Remove the ATS enclosure cover.
6. Install the current transformer (CT) on the
emergency source lines. Installation inside the
transfer switch enclosure is recommended.
Note: Be sure to route the leads through the
current transformer from opposite sides as
shown in Figure 2-15. The leads must cross
in opposite directions as they pass through
the transformer.
Note: See Section 2.7.4 for CT specifications.
Emergency source
leads must cross
through CT in opposite
directions as shown.
FROM GENERATOR
EMERGENCY LUGS ON ATS
GM88804
To TB1 on Load
Shed Circuit Board
CT
side view
Figure 2-15 Current Transformer (CT) Wiring