Monitoring technique Insulation monitor AI 898 varimeter According to VDE 0413 For DC-voltage systems Fixed response value Closed circuit operation Programmable for - manual reset (bridge LT1-LT2) - automatic reset (without bridge) External reset button on LT1-LT2 Test button to check the function of the device LED indicators 1 changeover contact Width 45 mm Function diagram Approvals and marking Applications Monitoring of insulation resistance in ungrounded DC-voltage systems. Indicators LEDEi: on, when no fault (output relay energised) LEDErdschl: on, when ground fault Notes Symmetric ground faults (same resistance between L+ - PE and L- - PE) will not be detected because of the measuring principle. In practice this is of no importance. Technical data Auxiliary circuit Auxiliary voltage U : AC 24, 42, 110, 230 V H DC 24, 60, 110, 220 V at AI 898/20 Voltage range: 0,8 ... 1,1 U N Frequency range: 45 ... 400 Hz Measuring circuit Nominal voltage U : DC 24, 48, 60, 110, 220 V N to 660 V on request Voltage range: 0,8 ... 1,1 U N Response value R : DC 24 ... 60 V: 6 k AN DC 110 V: 11 k DC 220 V: 22 or 50 k special values on request Setting R : fixed AN Internal test resistor: equivalent to R < 6 k E Internal DC resistance: DC 24 V: 5 k DC 48 ... 60 V: 3 k DC 110 V: 8 k DC 220 V: 30 k Max. measuring current (RE = 0): DC 24 V: 6 mA DC 48 V: 19 mA DC 60 V: 22 mA DC 110 V: 15 mA DC 220 V: 9 mA Operate delay at R = 50 k , CE = 1 F AN R from to 0,9 R : approx. 0,4 s E AN R from to 0 k : approx. 0,1 s E Hysteresis at R = 50 k : approx. 20 - 30 % AN All technical data in this list relate to the state at the moment of edition. We reserve the right for technical improvements and changes at any time. AI 898 / 18.10.01 d 1 0225237Technical data Variant Measuring error AI 898/20: for auxiliary supply DC 24 V at R = 50 k :< 25 % for DC 60, 110 or 220 V the relay is AN ambient temperature -5 ... 50 C, delivered with an external drop resistor within the permitted voltage range Nominal consumption: approx. 2,5 VA Ordering example vor Variant Output AI 898 / DC 220 V AC 230 V 50 k Response value Contacts: 1 changeover contact Auxiliary voltage Max. switching voltage: AC 400 V Nominal voltage Thermal current I : 6 A Variant, if required th Switching capacity Type to AC 15: 5 A / AC 230 V EN 60 947-5-1 Short circuit strength Connection example max. fuse ratinge: 5 A gL EN 60 947-5-1 L+ General data L- U N PE Operating mode: Continuous operation Permissible ambient and U U H H stocking temperature: - 20 ... + 60 C / - 25 ... + 70 C Clearance and creepage A1 11 L+ L- PE distances overvoltage category / 11 contamination level: 4 kV / 2 IEC 60 664-1 AI 898 EMC 12 14 Electrostatic discharge: 8 kV (air) EN 61 000-4-2 Fast transients: 2 kV EN 61 000-4-4 12 14 LT1 LT2 A2 Surge voltages between L wires for power supply: 2 kV EN 61 000-4-5 T M6107 b 0,5 kV at AI 898/20 between wire and ground: 4 kV EN 61 000-4-5 L+/L-: U N Interference suppression: Limit value class B EN 55 011 A1/A2: U H Degree of protection: Housing: IP 40 EN 60 529 Bridge LT1/LT2: manual reset Terminals: IP 20 EN 60 529 Without bridge LT1/LT2: automatic reset Housing: Thermoplastic with V0 behaviour according to UL subject 94 Vibration resistance: Amplitude 0,35 mm frequency 10 ... 55 Hz EN 60 068-2-6 Climate resistance: 20 / 060 / 04 EN 60 068-1 Terminal designation: EN 50 005 2 Wire connection: 2 x 2,5 mm solid or 2 2 x 1,5 mm stranded wire with sleeve DIN 46 228-1/-2/-3/-4 Wire fixing: Flat terminals with self-lifting clamping piece EN 60 999 Mounting: DIN rail EN 50 022 Weight: 240 g Dimensions Width x height x depth: 45 x 77 x 115 mm Standard type AI 898 DC 24 V 6 k AC 230 V Article number: 0001044 stock item Output: 1 changeover contact Nominal voltage U : DC 24 V N Auxiliary voltage U : AC 230 V H Fixed response value R :6 k AN Width: 45 mm E. DOLD & SHNE KG D-78114 Furtwangen Postf. 1251 Tel. +49 7723 654 0 Telefax +49 7723 654 356 e-mail dold-relays t-online.de internet