Littelfuse E7800 User Manual
Generator Control
Basic
E7800 SERIES
Motorized Potentiometer
Simplified Circuit Diagram
POWER
SUPPLY
E7800
(Motorized Potentiometer)
INCR
DEC
M
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”)
© 2013 Littelfuse Protection Relays & Controls
www.littelfuse.com/e7800
Rev: 4-A-050313
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