Toshiba TE Series Instruction Manual page 84

Basic Installation and Operation Guide
Appendix 4 (cont.) External OL Relay Applications
Caution: The circuit on TB-4 is at the same potential as the AC control voltage, but should
not be directly connected to it. PC board damage may result.
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Across-the-Line (Direct-on-Line) Bypass
Suggested control schematic is shown below for using the TE ...-BP
Series rated for Across-the-Line Bypass with an External Overload:
Disconnect
or
Circuit
Breaker
R / S / T /
L1 L2 L3
Solid State
Over Load
U / V / W /
T1 T2 T3
External
Over Load
MTR
Figure APP4.2: TE Wiring for Across-the-Line Bypass Operation with External Overload Relay
(Only the terminals necessary for this operation are shown)
In this example:
The Start / Run command (2-wire or 3-wire) energizes a control Relay
"CR". If the selector Switch is in the "SS" (Soft Start) position, the contact
of CR closes the 24VDC control signal to TB1, terminals 1 and 3 of the
TE Series, which begins ramping. When At-Speed status is reached, an
internal Bypass Pilot Relay is used to close the Bypass Contactor. While
in this mode, the TE Series CPU provides full motor protection, even
when the Bypass Contactor closes.
When the Selector Switch is placed in the "A-T-L" (Across-the-Line)
nd
position, a 2
B1 and B2 of TB4 which are internally connected in parallel to the
Bypass Pilot Relay contact in the Bypass Contactor coil circuit. Since the
TE Series electronics may be out of service, an External Overload is
added which only operates in this mode and protects the motor by
dropping out the connection between B1 and B2.
TE Series Digital Solid State Soft Starters 18 – 1250A
Start / Run
Command
(2-wire or 3-wire)
TE Starter
S S
.
CR
.
.
CR
1 2
TE-TB-1
(24VDC)
Bypass
Contactor
"BP"
G
isolated contact of CR is used to close the circuit between
AC CONTROL
POWER
CR
97 98
External
Off
OL
A- T -L
3
B1 B2 A1 A2
TE-
TE-
TB-2
TB-4
AC
Control Power
Potential
BP
Internal Bypass
Bypass
Pilot Relay
Contactor
Coil
TE...-BP Series
Internal Wiring