Appendix A Technical Specifications

Overload Specifications

 

 

 

 

 

Overload classes

Overload classes 2 through 23 with one second increments.

Trip Characteristics

Tripping time at 6 x IFLC = 95% of the overload class (±5%).

 

Tripping time at 1.5 x IFLC within two minutes for warm conditions for all classes.

Tripping threshold

(1.1 ± 0.05) x IFLC for motors with 1.00 service factor, and

 

(1.2 ± 0.05) x IFLC for motors with 1.15 service factor.

Tripping time

20 minutes @1.15 x IFLC for motors with service factor 1.

Mechanical jam protection

Sudden increase of the motor running current. Pick-up current adjustable from 120 to

SAMMS-MVX only

400% in increments of 5% of IFLC . Pick-up time 360 msec.

 

Default values: 200% IFLC .

 

Loss of load protection

Sudden decrease of motor running current. Pick-up current adjustable form 20 to 95% in

SAMMS-MVX only

increments of 5% of I FLC. Pick-up time 360 msec.

 

Default values: 50% I FLC.

 

Process current warning

Settings from 0 to 100% of IFLC.

 

SAMMS-MVX only

 

 

 

Accuracy

± 5% of overload trip curve values.

 

 

± 2% repeat accuracy.

 

Phase unbalance protection

Response time after 1 second

 

 

Shifted trip threshold value to 0.9 x IFLC at 40% phase unbalance.

Equipment ground fault protection

Response time after 1.4 seconds.

 

 

Pick-up time: 360 msec.

 

 

Pick-up current:

 

 

 

Overload Relay Size

Pick-up Current

Default

 

H3A

7A- IFLC

10A

 

H3B

7A- IFLC

10A

 

H3C

7A- IFLC

10A

 

H6

7A- I FLC

20A

Rotor protection

Cold stall time adjustable from 5 to 100 seconds in increments of 1 second. If cold stall

 

time is not known, default value shall be according to the type of motor used.

 

Motor Type

 

Cold Stall Time

 

Open Drip Proof (ODP)

 

10 Seconds

 

Totally Enclosed Fan Cooled (EFC)

20 Seconds

Ambient temperature

Motor ambient temperature adjustable 0 - 70°C in increments of 5°C.

 

Default value: 40°C.

 

 

 

 

 

 

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Siemens SAMMS-MV user manual Over load Spec ificat ions