Littelfuse E7800 User Manual

Generator Control

Basic

E7800 SERIES

Motorized Potentiometer

Simpliﬁed Circuit Diagram

POWER SUPPLY

E7800

(Motorized Potentiometer)

INCR

DEC

Description

The E7800 Motorized Potentiometer is typically used as an interface between increase/decrease contacts and a device requiring control/adjustments by an external potentiometer.

In generator control applications, the E7800 can be used as speed trim of an electronic speed governor, interfacing the synchronizer or the load sharer. It can also be used alone for manual speed adjustment or speed trim of electronic governors, or for remote control of generator voltage, power factor and reactive load (E7800 connected to Automatic Voltage Regulator (AVR)).

Features & Beneﬁts

FEATURES BENEFITS

Wire-wound potentiometer

Friction clutch

Resistance from 100 Ω to 10 kΩ

24 V DC version with Adjustable RPM

Built-in dust seal Long life expectation

Longer life expectation than carbon potentiometers

Motor can turn potentiometer against end position continuously, without damaging it

Wide range of potentiometers suitable for any governor or AVR

Simple ﬁne tuning possibility in regulation applications

Ordering Information

ORDERING NUMBER

E7800.00.xx 230 V-240 Vac 1.0 (50 Hz) 5 kΩ-1 turn

E7800.01.xx 220 V-240 Vac 2.0 (50 Hz) 5 kΩ-10 turn

E7800.02.xx 100 V-110 Vac 1.0 (50 Hz) 5 kΩ-1 turn

E7800.03.xx 24 Vac 2.0 (50 Hz) 5 kΩ-10 turn

E7800.04.xx 100 V-110 Vac 2.0 (50 Hz) 5 kΩ-10 turn

E7800.05.xx 220 V-240 Vac 2.0 (50 Hz) 5 kΩ-1 turn

E7800.09.xx 24 Vac 1.0 (50 Hz) 5 kΩ-1 turn

E7800.23.xx 24 Vdc 0.8-6 Adj. 5 kΩ-1 turn

E7800.24.xx 24 Vdc 0.8-6 Adj. 5 kΩ-10 turn

E7800.90.00 24 Vdc 0.8-6 Adj.

The E780 0 cannot be used fo r both AC and DC. The unit must be speciﬁed to order. Other vo ltages and comb inations are avail able on request .

Indicate potentiome ter value by replacing “x x” with digits per this tab le.

INDEX “XX”

POTENTIOMETER VALUE

00 5 kΩ (standard) 01 100 Ω 02 200 Ω 03 500 Ω

VOLTAGE RPM POTENTIOMETER

DC output voltage, 0-1.0 V (0-100%)

INDEX “XX”

POTENTIOMETER VALUE

04 1 kΩ 05 2 kΩ 06 10 kΩ

Speciﬁcations

Voltage range AC: 90-120% DC: 75-125% Consumption AC: 2.5 VA DC: 2 W Operating Temperature –15° C to +70° C EMC CE according to

EN 50 08 1-1 EN 50 08 2-1 EN50081-2 EN50082-2

Approvals CSA, UL component recognition Burn-in 50 hours before ﬁnal test Weight 0.35 kg Dimensions H 96 mm (3.8”); W 96 mm (3.8”); D 80 mm (3.1”) Panel cut out H 92 mm (3.6”); W 92 mm (3.6”)

Rev: 4-A-050313