Specifications

Type SSM Specication Guide

Low Voltage Products & Systems 5

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

(d) Separate Trip Curves shall be provided for Start and Run, allowing a higher level curve to avoid

nuisance tripping during acceleration, but dropping to another level for accurate motor protection while

at full speed. To maximize exibility, each trip curve shall be programmable as follows:

(i) Basic, using the NEMA Class ranges described above.

(ii) Locked Rotor programmable between 400 – 800% of FLA, and a trip time from 1–– 30

seconds.

(iii) Measured Start Capacity (I*I*T curve area) taken from the previous successful start (only

applicable to the Start Curve).

(e) Overload Alarm shall be provided to warn users of an impending overload trip. The Alarm level shall

be programmable between 40 – 95% of the Dynamic Thermal Register value. It shall provide an

adjustable delay of 1 – 20 seconds.

(f) Manual or Automatic Reset shall be selectable in programming to provide for automatic reset in

unattended remote applications.

2) Phase Monitoring shall be standard and based on motor current. In order to protect against disconnected

motor leads, this feature will function even if the line voltage remains normal. All features shall be as follows

and capable of being disabled if not needed:

(a) Phase Loss shall shut down the starter if current through any leg drops to 20% of unit FLA or less.

This protection shall be implemented via hardware and shall be non-adjustable. It shall provide an

adjustable trip delay of 1 – 20 seconds.

(b) Phase Imbalance Protection shall be provided with programmable sensitivity to provide both Alarm

and Trip points. The sensitivity shall be adjustable for phase-to-phase imbalances of between 5% and

30%. Each point shall provide an adjustable delay of 1 – 20 seconds.

the initial set pattern, the starter shall trip immediately. If phase rotation is correct, the starter can be

re-taught to recognize the new rotation.

3) Short Circuit Detection with dual mode protection for starting and running operation shall be standard.

This circuit MUST be provided to protect the starter from load failures. This protection shall be implemented

via hardware and shall be non-adjustable.

(a) In the starting mode the starter shall employ a º second pre-check routine to determine if the load

circuit has a fault condition and disable the ramping prior to reaching the Initial Voltage setting. This is

to avoid additional equipment damage after a fault that may have occurred while the starter was off.

(b) In the running mode, this feature will shut down the starter if current through any leg exceeds 10

times unit FLA for 12.5 milliseconds.

4) Over Current Protection shall be provided separate from the above to be used as a Shear Pin trip. It

shall be adjustable at lower levels for protecting mechanical components from undue shock when rapid

unexpected load changes occur.

(a) Adjustment level shall be from 100% to 300% of the programmed motor FLA.

(b) A time delay of up to 20 seconds shall avoid nuisance tripping from short duration transients.

5) Under Current Protection shall alarm the starter on an adjustable condition. This Load Loss sensor shall

be programmable from 10% to 90% of the programmed motor FLA, and, with a time delay of up to 20

seconds shall avoid nuisance tripping from short duration transients.

6) Ground Fault protection shall be provided to protect the motor from damage using the Residual Current

method. An Alarm and 2 trip levels, each adjustable from 5 – 90% shall be available with separate trip

times as follows:

(a) ALARM level preset at 5% with a 0.5 – 20 second delay.