Generator Control
Basic
E7800 SERIES
Motorized Potentiometer
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
POWER
SUPPLY
ORDERING
NUMBER
SUPPLY VOLTAGE)
(VAC)
(VDC)
OUTPUT
OPTIONS
SPECIAL
FUNCTION
E7800.0030
(Motorized Potentiometer)
230 V
230 V
230 V
230 V
230 V
230 V
230 V
230 V
110/100 V
110/100 V
24 V
24 V
24 V
24 V
24 V
24 V
24 V
110/100 V
110/100 V
110/100 V
110/100 V
110/100 V
110/100 V
110/100 V
230 V
230 V
230 V
230 V
200Ω, 1 turn
500Ω, 1 turn
1kΩ, 1 turn
2kΩ, 1 turn
10kΩ, 1 turn
5kΩ, 10 turn
100Ω, 10 turn
200Ω, 10 turn
2kΩ, 1 turn
10kΩ, 1turn
5kΩ, 10 turn
100Ω, 10 turn
200Ω, 10 turn
500Ω, 10 turn
1kΩ, 10 turn
2kΩ, 10 turn
10kΩ, 10 turn
5kΩ, 10 turn
100Ω, 10 turn
200Ω, 10 turn
500Ω, 10 turn
1kΩ, 10 turn
2kΩ, 10 turn
10kΩ, 10 turn
5kΩ, 1 turn
100Ω, 1 turn
200Ω, 1turn
500Ω, 1 turn
1 RPM
1 RPM
1 RPM
1 RPM
1 RPM
2 RPM
2 RPM
2 RPM
1 RPM
1 RPM
2 RPM
2 RPM
2 RPM
2 RPM
2 RPM
2 RPM
2 RPM
2 RPM
2 RPM
2 RPM
2 RPM
2 RPM
2 RPM
2 RPM
2 RPM
2 RPM
2 RPM
2 RPM
E7800
E7800.0040
E7800.0050
E7800.0060
E7800.0070
E7800.0080
E7800.0090
E7800.0100
E7800.0200
INCR
DEC
M
Features & Benefits
FEATURES
Wire-wound
potentiometer
Friction clutch
Resistance from 100 Ω
to 10 kΩ
24 V DC version with
Adjustable RPM
Built-in dust seal
E7800.0210
E7800.0220
E7800.0230
E7800.0240
E7800.0250
E7800.0260
E7800.0270
E7800.0280
E7800.0290
E7800.0300
E7800.0310
E7800.0320
E7800.0330
E7800.0340
E7800.0350
E7800.0360
E7800.0370
E7800.0380
E7800.0390
BENEFITS
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
Long life expectation
© 2015 Littelfuse Protection Relays & Controls
www.littelfuse.com/e7800
Rev: 4-C-032515
Generator Control
Basic
E7800 SERIES
Ordering Information (cont.)
ORDERING
NUMBER
SUPPLY VOLTAGE)
(VAC)
(VDC)
OUTPUT
OPTIONS
SPECIAL
FUNCTION
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
CE, RRR
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”)
E7800.0400
E7800.0410
E7800.0420
E7800.0430
E7800.0440
E7800.0450
E7800.0460
E7800.0470
E7800.0480
E7800.0490
E7800.0640
E7800.0650
E7800.0660
E7800.0670
E7800.0680
E7800.0690
E7800.0700
E7800.0710
E7800.0720
E7800.0730
E7800.0740
E7800.0750
E7800.0760
E7800.0770
230 V
230 V
230 V
24 V
24 V
24 V
24 V
24 V
24 V
24 V
24 V
24 V
24 V
24 V
24 V
24 V
24 V
24 V
24 V
24 V
24 V
24 V
24 V
24 V
1kΩ, 1 turn
2kΩ, 1 turn
10kΩ, 1 turn
5kΩ, 1 turn
100Ω, 1 turn
200Ω, 1 turn
500Ω, 1 turn
1kΩ, 1 turn
2kΩ, 1 turn
10kΩ, 1 turn
5kΩ, 1 turn
100Ω, 1 turn
200Ω, 1 turn
500Ω, 1 turn
1kΩ, 1 turn
2kΩ, 1 turn
10kΩ, 1 turn
5kΩ, 10 turn
100Ω,10 turn
200Ω, 10 turn
500Ω, 10 turn
1kΩ, 10 turn
2kΩ, 10 turn
10kΩ, 10 turn
2 RPM
2 RPM
2 RPM
1 RPM
1 RPM
1 RPM
1 RPM
1 RPM
1 RPM
1 RPM
0.8 - 6 RPM
0.8 - 6 RPM
0.8 - 6 RPM
0.8 - 6 RPM
0.8 - 6 RPM
0.8 - 6 RPM
0.8 - 6 RPM
0.8 - 6 RPM
0.8 - 6 RPM
0.8 - 6 RPM
0.8 - 6 RPM
0.8 - 6 RPM
0.8 - 6 RPM
0.8 - 6 RPM
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.
© 2015 Littelfuse Protection Relays & Controls
www.littelfuse.com/e7800
Rev: 4-C-032515
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