UFR1001E 12420-0701-14 Page 18 / 34 www.ziehl.deDetailed description10.1 Description of the connectionsConnection DescriptionA1 and A2 Rated control supply voltage Us, see Technical Data11, 12, 14; 21, 22, 24 Relay K1 and K2E1 – E2Enable – InputVolt-free contact8vsr .8 → 8 off.8 , no function8vsr .8 → 8 on.8 , E1-E2 closed: Vector shift active but not evaluated,monitoring of feedback contacts off for use with generator (mainssynchronization)8vsr .8 → 8stby.8 , E1-E2 closed: K1 and K2 off (standby), vector shift off8vsr .8 → 8Y1Y2.8 , E1-E2 closed: Feedback contacts no evaluated, vectorshift off, when using with generator (mains synchronization)Y0, Y1, Y2Inputs, feedback contactsVolt-free n/o or n/c contact, self-learning when switching onSet value > turn-on time section switch under 8rel .8 → 8trel.8 / can switch-off if not connected or if external devices/switches can activate the sectionswitch (8off .8)I1 Supply voltage for digital outputs, max. 27 V DCQ1…Q4 Digital output over-/under voltage/-frequency, Q3 + Q4 = ROCOFQ5 Digital output error, in Programs with >> and << additionally the 2nd thresholdvalueL1, L2, L3, N Phase L1, L2, L3 and neutral conductor