104 Electrical installationWiring the PTC thermistor relay(s) (options +L505, +2L505, +L513, +2L513)The external wiring of option +2L505 and +2L513 (two thermistor relays) is shown below.For example, one relay can be used to monitor the motor windings, the other to monitorthe bearings. The maximum contact load capacity is 250 V AC 10 A. For the actual wiring,see the circuit diagram delivered with the drive. For instructions on commissioning options+L513 and +2L513, see ATEX-certified motor thermal protection functions for cabinet-builtACS880 drives (options +L513+Q971 and +L514+Q971) user’s manual(3AXD50000014979 [English]).12345678910111225262728X506TT1…n × PTC651…n × PTC1 PTC sensors monitored by relay K74.RG = R1 + R2 + RN < 1.5 kohm.2 External reset for relay K74.Note: With +L505 and +2L505, the terminalscan be bridged for automatic reset. However,this is not allowed by ATEX regulations.3 PTC sensors monitored by relay K75.RG = R1 + R2 + RN < 1.5 kohm.4 External reset for relay K75.Note: With +L505 and +2L505, the terminalscan be bridged for automatic reset. However,this is not allowed by ATEX regulations.5 Overheat indication from relay K74:overtemperature = contact open.6 Overheat indication from relay K75:overtemperature = contact open.2314
