Model 6 Motor Control Centers 80459-641-01E
Section 9—iMCC 10/2012
© 1999–2012 Schneider Electric All Rights Reserved88
ENGLISH
TeSys T Retrofit Applications
NOTE: For retrofit applications, contact your local Schneider Electric
representative for assistance. Schneider Electric assumes no responsibility
for the design or implementation of retrofits unless contracted to perform
them. See Schneider Electric data bulletin no. 8998DB1004 for upgrade of
the Motor Logic™ Plus or Motor Logic Plus II solid state overload relay to the
TeSys™ T motor management system.
Remove the starter from the unit to replace the overload (melting
alloy/bi-metallic). See “Removing the Control Unit” on page 57.
Terminal blocks (OEKTTBML) should be used for two-speed applications
requiring multiple passes to achieve the proper adjustment range.
Restrain looped load cabling between the TeSys T controller and the
terminal block with wire ties (or the equivalent) when terminal kits are used.
On 600 V Size 1 applications, add a third wire tie between the circuit
breaker and contactor near the contactor line lugs. Refer to instruction
bulletin 30072-013-29 for additional information.
Use copper wire only on device power and control terminals. Conductors
must be sized for 60 °C or 75 °C National Electrical Code
®
(NEC
®
) ratings.
Pressure wire terminals are suitable for single conductor wire sizes #24–14,
solid or stranded. Two conductor wire size is #24–18. Terminal instruction
labels are located adjacent to the terminal block or on the wireway door.
Applications Requiring Turns There are some applications that require more than one wiring turn through
the TeSys T controller.
• All NEMA Size 4 applications require three passes through separately
mounted current transformers (CTs) rated 300:5.
• Certain two-speed constant or variable torque applications require two
passes through the TeSys T conductor (CT) windows through which the
motor leads must pass before being connected to the load terminals on
the contactor (T1, T2, and T3). These two-speed constant or variable
torque applications are for NEMA Size 1 (3/4 HP, 480 V) and all NEMA
Size 2. By allowing multiple passes (turns) of the load leads through
these CT windows, protection can be provided for motors with a full-load
current lower than the specified operating range. Two passes of the load
leads through each window effectively increase (by a multiple of two) the
current that the TeSys T senses.
• All three conductor windows must have the same number of passes,
looped in the same direction, for the TeSys T to operate properly.
DANGER
HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH
• Apply appropriate personal protective equipment (PPE) and follow safe
electrical work practices. See NFPA 70E or CSA Z462.
• This equipment must only be installed and serviced by qualified
electrical personnel.
• Turn off all power supplying this equipment before working on or inside
equipment.
• Always use a properly rated voltage sensing device to confirm power is off.
• Replace all devices, doors, and covers before turning on power to this
equipment.
Failure to follow this instruction will result in death or serious injury.
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