InsulGard System Installation and Start Up Guideline
12
b) The RTD-6 module goes in series with the existing motor RTD wiring. Verify that wires from the motor RTDs
are connected to ”RTD In” side of the RTD-6 PD sensor. Verify that the coaxial cable central wire and shield
are connected
to PD “+” and “-“ contacts accordingly. Verify that board is reliable grounded..
c) If the existing RTD termination box is not large enough, an auxiliary box will need to be installed next to it to
house the RTD Module and wired in appropriately.
d) Up to six coax cables (12 if 2 modules are used) are required for connection to the Sensor Interface Board.
After connecting RTD wires from stator to RTD PD module (to RTD
In
side), verify RTD connection and
integrity from RTD
Out
side of the module (right side). Write results down in the Table 5 in Appendix 2 -
e) After reconnecting RTD wires to temperature metering,
verify proper reading on customer’s metering
system.
2) Auxiliary sensors
a)
TS
– External Temperature sensor - 3-wire 100 Ohm platinum RTD in protecting shell. For rotating machines
using spare 100 Ohm platinum RTD in stator winding is preferable
b)
HS
– External Humidity sensor
c)
CT
- Load (CT) sensor. 5 Amps primary current, ratio 1000:1. Mostly used for rotating machines. CT Sensor
should be installed over secondary wire of an existing metering current transformer.
d)
CTF
- Split-core Primary Current Transformer (Flex Core) with CT sensor preinstalled on shortening jumper
of Primary CT secondary winding. CTF is used if there is no metering CT in feeder termination compartment
and corresponding metering CT is too far from the InsulGard. Install CTF around a feeder cable of any phase
in a motor feeder termination enclosure.
It must be installed over the shielded part of the feeder cable
with cable shield grounding wire coming through the CT.
In case of several feeders per phase, install it
only around one of the feeders.
TS and HS sensors
CT sensor
CTF sensor
Figure 1-11
