Appendix a technical specifications – Siemens MCC-3298 User Manual

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Appendix A Technical Specifications

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Overload Specifications

Overload classes

Overload classes 2 through 23 with one second increments.

Trip Characteristics

Tripping time at 6 x I = 95% of the overload class (±5%).
Tripping time at 1.5 x I within two minutes for warm conditions for all classes.

Tripping threshold

(1.1 ± 0.05) x I for motors with 1.00 service factor, and
(1.2 ± 0.05) x I for motors with 1.15 service factor.

Tripping time

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

Mechanical jam protection
SAMMS-LVX only

Sudden increase of the motor running current. Pick-up current adjustable from 120 to
400% in increments of 5% of I . Pick-up time 360 msec.
Default value: 200% I .

Loss of load protection
SAMMS-LVX only

Sudden decrease of motor running current. Pick-up current adjustable from 20 to 95% in
increments of 5% of I . Pick-up time 360 msec.
Default value: 50% I .

Process current warning
SAMMS-LVX only

Settings from 0 to 100% of I .

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 I at 40% phase unbalance.

Equipment ground fault protection

Response time after overload class in seconds.
Pick-up time: 360 msec.

Pick-up current:
Overload Relay Size Pick-up Current Default
1A 1.5A 1.5A
1B 2A- 5A 5A
1C 2A- I 5A
2A 2A- I 10A
2B 2A- I 10A
3 2A- I 10A
4 2A- I 10A
5 5A- I 10A
6 10A- I 20A

I is the value of I for OLR#2 if F# is not set to OFF. If F3 is OFF, I is the value of
I for OLR#1.

Ambient temperature

Motor ambient temperature adjustable 0 - 70°C in increments of 5°C.
Default value: 40°C.

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