Page 90 of Contactors and Motor Protection by Moeller Electric USA

overloadrelays selection aids l1 l2 l3 n z1 menu class 5 10 15 20 25 30 35 40 95 97 05 07 on off z2 c1 c2 y1 y2 a1 a2 reset fault l1 l2 l3 e 0 ­ 820 a free parameter 1 105 l p class free parameter 1 free parameter 2 reset hand auto if 1 free parameter 1 105 t1 m 3 mode test reset up down t2 on 96 98 06 08 off if 1 1 if internal fault inputs a1/a2 t1/t2 c1/c2 y1/y2 rated control voltage thermistor sensor ssw core-balance transformers remote reset 95 96 97 98 05 06 07 08 outputs nc contact for overload thermistor no contact for overload thermistor nc contact freely assignable no contact freely assignable switchgear and cable sizing corresponding to the respective starting inertia class the switchgear is designed for class 10 in normal and overload operation to ensure that the switchgear circuit-breaker and contactor as well as the cables are not overloaded with extended tripping times they must be over-dimensioned accordingly the rated operational current ie for switchgear and cables can be calculated with the following current factor while taking the tripping class into account tripping class current factor for rated operational current ie class 5 1.00 class 10 1.00 class 15 1.22 class 20 1.41 class 25 1.58 class 30 1.73 class 35 1.89 class 40 2.00 relays with integrated sensor with the zev-xsw-25 to zev-xsw-145 push-through sensors the motor supply leads for each phase are pushed through the respective push-through openings on motor currents which are less than 1 a the motor supply leads with the zev-xsw-25 are inserted in loops the number of loops depends on the rated motor current involved number of loops n rated motor current in current settings on relay ie between lowest and highest value a a 4 0.31 ­ 0.4 1.24 ­ 1.6 3 0.41 ­ 0.62 1.23 ­ 1.86 2 0.63 ­ 1.24 1.26 ­ 2.48 the current setting ie of the device is calculated as ie n x in 91

[close]