Toshiba 48-1250 A - Manual (Page 7)

TD - Series
- 1 -
TD Series 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.
Chapter 1 - Introduction
1.2 Specifications and Performance Features
Type of Load Three phase AC induction motor
AC Supply Voltage 208 - 600VAC ±10%, 50/60 Hz
HP Ratings 48 - 1250 Amps, 10 - 1125 HP
Unit Overload Capacity
(Percent of motor FLA)
125% - Continuous
500% - 60 seconds
600% - 30 seconds
Power Circuit 6 SCRs
SCR Diode Ratings
(Peak Inverse Voltage)
1600V
Phase Insensitivity Unit operates with any phase sequence
Transient Voltage Protection RC snubber dv/dt networks on each phase.
Cooling
Convection up to 180A, fan assisted 62 - 120A,
Fan ventilated 220 - 1250A
Bypass Contactor
Full horsepower rated contactor included as standard in all
Type 12, 3R, 4 & 4X enclosed units 120A and above.
Ambient Condition Design
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
Control
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.
Approvals UL Listed, Canadian UL (cUL) Listed
Auxiliary Contacts