Littelfuse E7800 Series - Manual

Generator Control
© 2013 Littelfuse Protection Relays & Controls
Basic
E7800 SEriES
Motorized Potentiometer
OrdEring
numBEr
VOltagE rPm POtEntiOmEtEr
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.
DC output voltage,
0-1.0 V (0-100%)
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)).
Ordering Information
Simplified Circuit Diagram
FEaturES BEnEFitS
Wire-wound
potentiometer
Longer life expectation than carbon
potentiometers
Friction clutch
Motor can turn potentiometer against end
position continuously, without damaging it
Resistance from 100 Ω
to 10 kΩ
Wide range of potentiometers suitable for
any governor or AVR
24 V DC version with
Adjustable RPM
Simple fine tuning possibility in regulation
applications
Built-in dust seal Long life expectation
Features & Benefits
indEx
“xx”
POtEntiOmEtEr
ValuE
00 5 kΩ (standard)
01 100 Ω
02 200 Ω
03 500 Ω
indEx
“xx”
POtEntiOmEtEr
ValuE
04 1 kΩ
05 2 kΩ
06 10 kΩ
The E7800 cannot be used for both AC and DC. The unit must be specified to order.
Other voltages and combinations are available on request.
indicate potentiometer value by replacing “xx” with digits per this table.
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
EN50081-1
EN50082-1
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”)
www.littelfuse.com/e7800
M
POWER
SUPPLY
INCR
DEC
E7800
(Motorized Potentiometer)
Rev: 4-A-050313