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Figure 2. Internal Schematic of the Type CW Relay in the
Type FT 11 Case.
The indicating contactor switch has two taps that
provide pickup setting of 0.2 or 2 Amperes. To
change taps requires connecting the lead located in
front of the tap block to the desired setting by
means of a screw connection.
3.2
Trip Circuit Constants
Indicating Contactor Switch (ICS)
0.2 ampere tap 6.5 ohms dc resistance
2.0 ampere tap 0.15 ohm dc resistance
4.0
INSTALLATION
The relays should be mounted on switch board pan-
els or their equivalent in a location free from dirt,
moisture, excessive vibration and heat. Mount the
relay vertically by means of the four mounting holes
on the flange for semi-flush mounting or by means
of the rear mounting stud or studs for projection
mounting. Either a mounting stud or the mounting
screws may be utilized for grounding the relay. The
electrical connections may be made directly to the
terminals by means of screws for steel panel
mounting or the terminal studs furnished with the
relay for thick panel mounting. The terminal studs
may be easily removed or inserted by locking two
nuts on the stud and then turning the proper nut
with a wrench.
For detailed FT case information refer to I.L. 41-
076.
Sub 1
Sub 1
183A776
183A776
Figure 3. Internal Schematic of the Type CW Relay with
Figure 4. Current and Voltage Phasors at System Unity
5.0
SETTINGS
The watt tap, the time dial setting and the ICS tap
must be selected.
5.1
Overwatt Application
The CW for three phase applications has taps which
represents the minimum balanced three phase watts
divided by
value is also volt-Amperes at which the disc will
begin to move with current leading voltage applied to
the relay by 30 degrees. When connected for watt
sensing, the relay current leads relay voltage by 30
SPDT Contacts in Type FT 11 Case.
Power Factor Applied to Type CW Relay.
3
that will cause the disc to move. Tap
41-241.3L
Sub 2
629A173
Sub 1
849A304
3
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