Toshiba 18 - 1250 A - Manual (Page 25)

TE Series Digital Solid State Soft Starters 18 – 1250A
18
4.2.2 Three-Wire Control Connection
For standard 3-wire control, connect dry (voltage free) contacts of the
Stop / Start buttons as shown on the diagram directly above the terminal
strip. Connect the NO contact of the Start button to Terminal #1 (far left
terminal), the common point between the Stop and Start to Terminal #2
(2
nd
from left) and the NC from the Stop button to Terminal #3 (3
rd
from
left).
ƒ 4.2.2.a
Seal In Contact
The TE Series uses an internally pre-wired “seal-in” contact around
the Start button (Terminals 1 and 2). No external relay or auxiliary
output connection is necessary.
4.2.3 Two Wire Control: Relay / PLC Connection
An alternate connection for automated or unattended operation replaces
start/stop push buttons by connecting a dry (voltage free) maintained
contact closure between terminals 1 and 3 as shown in Figure 4.2.3.
When this contact is closed, the TE Series starter will start and run.
When it is opened, it is the same as a Stop command.
ƒ 4.2.3.a
Automatic Functions and 2 Wire Control
If using the Time Clock functions (F032-F039) or Auto Reset
functions (F052 – F053), special consideration must be given to
using 2 wire control. Refer to Appendix 3 for additional details and
information on time clock functions, and section 5.6.9 for details on
using Auto-Reset functions.
ƒ NOTE:
When a maintained contact is used for start/stop it is advisable to
set the overload relay to the manual reset position. This will prevent
the motor from restarting if the thermal overload trips and then cools
off.
CAUTION
Control Terminals 1-10 of TB1 are a 24VDC circuit from an internal
power supply of the TE Series.
Use dry (unpowered) contact closures only. Applying any voltage
to these terminals will result in damage to the TE Series control
board.
If existing 120VAC or other powered control circuit must be
interfaced, use interposing relays or control the TE Series with 2
wire control as shown above.
4.2.4 Interlock Connection
TB1 provides a connection point for an external dry (voltage free) N.C.
(Normally Closed) interlock device between terminals 4 and 5.
Examples where this interlock connection would be used include low oil,
high temperature, or excess vibration dropout from user supplied
devices. A factory-installed jumper is provided which allows the TE
Series unit to operate if external interlocks are not used. If this jumper is
removed and an interlock is not used, the TE Series unit will not
function.
N C JOG RAMP2 PTC OPTO
Connect 3 wire
control here
as shown
Figure 4.2.2
3 Wire Control Connection
TB-1
1 2 3
N C JOG RAMP2 PTC OPTO
Connect 2 wire
control / PLC
output here
Figure 4.2.3
2 Wire Control Connection
TB-1
1 2 3
N C JOG RAMP2 PTC OPTO
Remove factory jumper
and connect external
interlock device here
Figure 4.2.
External Interlock Connection
TB-1
4 5