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Generator Control Basic T7900 Series Electronic Potentiometer Description The T7900 Electronic Potentiometer is used as converter between pulse contacts and a device requiring control adjustment by a voltage or current signal, such as an electronic speed controller. The T7900 acts in a similar manner to a motorized potentiometer, except that the outputs are a voltage, a current or a pulse width modulated signal (PWM), while the motorized potentiometer has a variable resistor output. In generator control applications, the T7900 can be used together with a Synchronizer and a Load Sharer. The T7900 converts the increase and decrease pulses of these modules into a suitable analog voltage, current or PWM signal. This analog output signal can be used as a control input to the electronic speed controller. + – REF SUPPLY 24 Vdc/Vac RESET Simplified Circuit Diagram POWER REF. IN1 IN2 IN3 INCR REF DEC T7900 (Electronic Potentiometer) 0-10 V REF Optional AC Supply L1 L2 ±10 V 0-20 mA PWM T7900.0010 Terminals 11-12 1-3 24 Vdc/Vac T7900.0030 Features Wide selection of output ranges including PWM BENEFITS Ensures possible use with a broad variety of speed governors and voltage regulators Independent ramp-up & ramp-down time setting Provides optimum controlabilty of speed governors and voltage regulators regardless of generator size Power reference function Enables alternative use as power reference unit providing generator load set point in grid parallel installations Available with Vac supply Enables direct supply from installation Visual indication of increase/decrease signals DIN-rail or screwmount & adjustment by potentiometers Provides quick and concise status information Easy installation Specifications Ordering Information Ordering Number Features & Benefits 250 Vac Supply 8-36 Vdc/Vac Max. 120 mA at 24 Vdc Consumption Output Ranges –10 V-+10 V (or any part of this, e.g. 0 V-+1 V) 0-20 mA (or any part this, e.g. 4 mA-20 mA) 0-100% PWM 500 Hz (or any part of this e.g. 10-90%) 0-100% PWM 2.94 MHz (or any part of this e.g. 10%- 90%) PWM Output Signal Frequency: 500 Hz of 2,94 KHz. Level: 0-10 V Default reference: 50% Operating Temperature –20°C to +70°C EMC EN50263 Burn-in 50 hours before final test Enclosure Material Polycarbonate. Flame retardant Weight 0.3 kg for T7900-00, 0.5 kg for other types DimensionsH 70 mm (2.7“); W 100 mm (3.9“); D 115 mm (4.5“) 35 mm DIN rail or 4 mm (3/16”) screws Installation www.BDTIC.com/littelfuse © 2013 Littelfuse Protection Relays & Controls www.littelfuse.com/t7900 Rev: 4-A-050313