2-20 B90 LOW IMPEDANCE BUS DIFFERENTIAL SYSTEM – INSTRUCTION MANUALSPECIFICATIONS CHAPTER 2: PRODUCT DESCRIPTION2AC VOLTAGEVT rated secondary: 50.0 to 240.0 VVT ratio: 1.00 to 24000.00Relay burden: < 0.25 VA at 120 VConversion range: 1 to 275 VVoltage withstand: continuous at 260 V to neutral1 min/hr at 420 V to neutralFREQUENCYNominal frequency setting: 25 to 60 HzSampling frequency: 64 samples per power cycleTracking frequency range: 20 to 70 HzCONTACT INPUTSDry contacts: 1000 Ω maximumWet contacts: 300 V DC maximumSelectable thresholds: 17 V, 33 V, 84 V, 166 VTolerance: ±10%Contacts per common return: 4Recognition time: < 1 msDebounce time: 0.0 to 16.0 ms in steps of 0.5Continuous current draw: 4 mA (when energized)CONTACT INPUTS WITH AUTO-BURNISHINGDry contacts: 1000 Ω maximumWet contacts: 300 V DC maximumSelectable thresholds: 17 V, 33 V, 84 V, 166 VTolerance: ±10%Contacts per common return: 2Recognition time: < 1 msDebounce time: 0.0 to 16.0 ms in steps of 0.5Continuous current draw: 4 mA (when energized)Auto-burnish impulse current: 50 to 70 mADuration of auto-burnish impulse: 25 to 50 msIRIG-B INPUTIRIG formats accepted: B000…B007, B120…B127IRIG control bits: IEEE Std C37.118.1-2011Amplitude modulation: 1 to 10 V pk-pkDC shift: TTL–CompatibleInput impedance: 50 kΩIsolation: 2 kVDIRECT INPUTSInput points: 256Remote devices: 16Default states on loss of comms.: On, Off, Latest/Off, Latest/OnRing configuration: Yes, NoData rate: 64 or 128 kbpsCRC: 32-bitCRC alarm:Responding to: Rate of messages failing the CRCMonitoring message count: 10 to 10000 in steps of 1Alarm threshold: 1 to 1000 in steps of 1Unreturned message alarm:Responding to: Rate of unreturned messages in the ring configurationMonitoring message count: 10 to 10000 in steps of 1Alarm threshold: 1 to 1000 in steps of 1
