Specifications

Type SSM Specication Guide

Low Voltage Products & Systems 7

ABB Inc. • 888-385-1221 • www.abb.com/lowvoltage 1SXU132173M0201 [AC 1007.2] - 2/02

3) Stop Voltage Level: adjustable from 100 – 0% of line voltage to automatically turn off the starter when the

output torque has reached a desired level. Programming shall not allow the Stop level to be set higher than

the Step Down Level. External timers shall not be needed to turn off the starter.

4) Selectable Operation During Overload shall be available to allow the user to decide if the motor shall

turn off or continue to Decel when an overload condition is detected.

D) Starter Protection shall be provided to maintain reliability of both the equipment and the circuit components,

with the following features:

1) Shorted SCR Detection shall be standard. This function must automatically prevent a “start” sequence

when at least one SCR is shorted. A means of having qualied service personnel defeat the lockout of this

circuit MUST be provided to allow for “Must Run” situations.

2) Shunt Trip Circuit shall be standard. This feature will instantly energize a dry relay contact that can be

wired to a “Shunt Trip” coil of the circuit breaker in order to protect the motor from damage. This protection

shall only operate if there is current owing through any phase of the starter when in the “Off” condition,

such as when there are multiple shorted SCRs or a bypass contactor stuck on. This feature shall be

independent of the above Shorted SCR protection so that it cannot be defeated.

3) Starter Overtemp Trip shall be built-in and protect the SCRs from excessive heat build-up in the enclosure

or heat sinks. Thermal sensors on the heat sinks shall be pre-wired to one of the programmable inputs that

has been factory preset as the Over Temp input.

E) Inputs shall be provided for the control and option selection of the starter as follows.

1) Digital Inputs: All input and control devices shall be rated for 120VAC control or shall require dry contact

closures without the need for external power supplies or interposing relays.

(a) On-Off Control shall be 120VAC to avoid potential problems with voltage drop in long control wire

runs. The starter shall provide for 2-wire or 3-wire control schemes. Seal-In relay contact for the 3-wire

control scheme shall be internal, dedicated to that use and not counted as an output contact. Terminals

shall be provided for use in interlocking with programmable output relays or external devices.

(b) User Inputs: 4 programmable digital inputs shall be provided. Each input shall accept dry contact

closures from external user supplied devices, and can be named for display on the DCU when

energized. 2 of these inputs shall be preset as Temperature and Dual Ramp Select, but can be

changed by the user. Inputs can be programmed as N.O. or N.C., and programmed with a de-bounce

timer of 0 – 60 seconds. Each input can be assigned to operate any of the Programmable Outputs.

with adjustable offset and gain.

F) Outputs shall be provided for the following functions in addition to the seal-in relay used in 3-wire control

schemes as mentioned above.

1) Digital Outputs shall be eight (8) Form “C” contact relay outputs, rated for 240VAC, 5AMPS, 1200VA max.,

with each relay being programmable for any one of the following functions;

(a) Indicator Relay programmable to change state on any of the following conditions:

Run / Stop, Start / End of Decel, Timed Output, At Speed / Stop, At Speed / End of Decel, Dual Ramp

Selected, Self Test Fail.

(b) Fault Trip Relay programmable for each of the following fault conditions: Overload, Phase Imbalance

/ Loss / Reversal, Lock Out Inhibits, External Inputs, Short Circuit, Over Current / Shear Pin, Ground

Fault HISET / LOSET, Over / Under Frequency, I2T Start Curve, Shorted SCR, Shunt Trip, Over Temp,

Under Current / Load Loss.

Overload Warning, Overcurrent Warning, Ground Fault Warning, Under Current Warning, Imbalance

Warning, Thermal Register Warning.