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Digital Solid State Soft Starter; Chapter 1: Introduction; General; Specifications And Performance Features - Toshiba 48-1250 A Instruction Manual

Low voltage digital solid state starter 48-1250 a
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TD Series
Chapter 1 - Introduction
Digital Solid State Soft Starter 48 - 1250A

1.1 General

The TD Series is a digitally programmable solid state reduced voltage
soft starter. Its six SCR design features a voltage/current ramp with an
anti-oscillation circuit for smooth load acceleration. The SCRs are sized
to withstand starting currents of 500% for 60 seconds (compared to
350% for 30 seconds from other manufacturers). The TD Series features
smooth, stepless ramp control which reduces motor inrush current and
excessive wear on the mechanical drive train components. In addition to
having easy to understand diagnostic LEDs, the TD Series includes a
programmable keypad for setting operating parameters for the ideal
starting cycle. Starting torque, ramp time, current limit, dual ramp, and
decel control are standard features on the TD Series. By simply adjusting
the unit's starting torque, ramp time and current limit functions, the starting
electrical characteristics of the motor can be matched to the mechanical
characteristics of the drive train for controlled acceleration of the load.
The TD Series includes solid state electronic overload protection in
addition to numerous other protective features. It is factory wired for 120
VAC control voltage and two or three-wire start/stop control (Units can
also be ordered with 240 VAC control voltage if required). Programmable
auxiliary contacts and provisions for interlocking are also included.

1.2 Specifications and Performance Features

Type of Load
AC Supply Voltage
HP Ratings
Unit Overload Capacity
(Percent of motor FLA)
Power Circuit
SCR Diode Ratings
(Peak Inverse Voltage)
Phase Insensitivity
Transient Voltage Protection
Bypass Contactor
Ambient Condition Design
Auxiliary Contacts
TD - Series
- 1 -
Three phase AC induction motor
208 - 600VAC ±10%, 50/60 Hz
48 - 1250 Amps, 10 - 1125 HP
125% - Continuous
500% - 60 seconds
600% - 30 seconds
6 SCRs
Unit operates with any phase sequence
RC snubber dv/dt networks on each phase.
Convection up to 180A, fan assisted 62 - 120A,
Fan ventilated 220 - 1250A
Full horsepower rated contactor included as standard in all
Type 12, 3R, 4 & 4X enclosed units 120A and above.
Chassis units: 0° to 50 °C (32° to 122°F)
Enclosed units: 0° to 40°C (32° to 104°F)
5 - 95% relative humidity
0 - 3300 ft. (1000m) above sea level without derating
2 or 3 wire 120VAC (customer supplied)
Optional 240VAC control voltage and CPTs are available.
Type / Rating: Form C (SPDT), rated 5 Amps,
240VAC max. (1200VA)
3 Programmable Relays
Fault Indicator: AC triac solid state switch
240VAC, 50mA max.
UL Listed, Canadian UL (cUL) Listed


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