User Manual Manual

3-23 Functions

Publication 825-UM001B-EN-P January 2001

Figure 3.10 Reduction in Permissible Motor Output Due to Voltage Asymmetry

per IEC and NEMA

Table 3.L Asymmetry (Phase Unbalance) Setting Parameters

➊ –5…60 °C (2…140 °F)

➋ If auxiliary relays #2 and #3 are assigned to the communication (refer to page 5-16) they cannot be selected

here.

High Overload and Jam

When an overload is excessively high and the motor jams, unnecessary mechanical and

thermal loading of the motor and transmission elements can be avoided by switching the

motor off immediately. This reduces consequences of accident and loss of production. A

gradual increase in overload can be detected early and reported (e.g., bearing damage). The

protective function activates as soon as the motor has started.

Warning ➊

(Current Asymmetry)

Trip ➊

Function

Factory setting Off On

Response Level

Setting range 5…80% 5…80%

Factory setting 20% 35%

Setting increments 5% 5%

Tripping Delay

Setting range — 1…25 s ± 0.2 s

Factory setting — 2.5 s ± 0.2 s

Setting increments — 0.5 s

Output Relay ➋

Selection (relays) AL, #1…#5 MR, AL, #1…#5

Factory setting AL MR

1.0

0.9

0.8

0.7

012345

∆

[%]

Reduction factor for

motor output

∆U Voltage asymmetry

in percent