Electric actuator accessories Figure 777/778
Accessories: electric
Anti-condensation heater.
Plan view with cover removed
Fig. 777/778-012-018
Plan view with cover removed
Fig. 777/778-050-070-150
Retrofit procedure
Hard wired units
1. Fit heater to switchplate as shown in
diagram using M3 screws provided.
2. Connect leads to terminal strip as shown in
appropriate wiring diagram.
Electronic units
1. Plug heater into socket marked HTR.
Note: in all cases ensure that any internal
wiring is more than 15 mm away from heater
element.
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EUKGH-0058-EN-0108
Electric actuator accessories Figure 777/778
Accessories: electric - anti-condensation heater
Heater
Heater
supply
(electronic)
Heater
Heater
Heater
supply
(1PH & DC hard wired)
Heater
supply
(3PH hard wired)
Heater for electronic units (plug-in)
Heater for hard wired units
Operating specifications
Heater type
Thermostat
Cut out temperature
Reset temperature
Power consumption
-
resistance element (wire-wound)
self resetting bi-metal type
25°C
20°C
8W to 12,5W
Resistance values for different heater voltages
Hard wired units
Voltage
Resistance
Working power
Rated power
(volts)
(ohms)
(watts)
(watts)
12
24
48
110
220
15
68
220
1K
3K9
9.5
8.5
10.5
12
12.5
15
15
15
15
15
110
220
1K
5K1
Electronic units
12.5
9.5
15
15
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page 2
Electric actuator accessories Figure 777/778
Accessories: electric
6 or 8 limit switch pack.
Plan view with cover removed
Fig. 777/778-012-018
Plan view with cover removed
Fig. 777/778-050-070-150
Retrofit procedure
1. Disconnect all push-on connectors from limit switch pack noting location of each wire for
reassembly.
2. Remove M3 screw at base of switch pack.
3. Remove O-ring from top of camshaft and remove circlip if fitted.
4. Lift switch assembly from camshaft taking care not to damage switch operating levers.
5. Fit 2 or 4 additional cams to camshaft orientated as shown in diagram.
6. Fit new switch pack assembly over camshaft taking care not to bend the switch operating
levers and locating the moulded pins (on the baseplate of the switchpack) in the location holes
in the switchplate, secure using the M3 screw.
7. Rewire in accordance with appropriate wiring diagram.
8. Replace O-ring and circlip to camshaft.
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page 3
Electric actuator accessories Figure 777/778
Accessories: electric - 6 or 8 limit switch pack
Switch identification
convention
Cam orientation
Cam profiles
for switches 1, 3, 5, 7
end of travel
mid travel
for switches 2, 4, 6, 8
switches 2, 4, 6, 8
switches 1, 3, 5, 7
Operating specifications
Switch details
Cam setting procedure
1. Operate actuator to closed position (open
position for F777/778-150)
2. Turn cam 1 clockwise until it just operates
switch 1 and secure to camshaft using M4
grubscrews in cam.
3. Turn cam 3 clockwise until it just operates
switch 3. Turn cam 3 a further 2 to 3
degrees clockwise and secure to camshaft
4. Operate actuator to open position (closed
position for F777/778-150).
5. Turn cam 2 anti-clockwise until it just
operates switch 2 and secure to camshaft.
6. Turn cam 4 anti-clockwise until it just
operates switch 4. Turn cam 4 a further 2 or
3 degrees anti-clockwise and secure to
camshaft.
7. Adjust cams 5,6,7,8, by operating actuator
to desired switch operating position. Turn
appropriate cam until switch operates and
secure to camshaft. Cams 5, 7 operate the
switches in a clockwise direction. Cams 6.8
operate the switches in a anti-clockwise
direction.
• standard V9 type, single pole double throw (SPDT)
• switch ratings - as table show
Voltage
Resistive Load
(Volts)
AC
125
250
DC
Up to 15
30
50
75
125
250
Tungsten Lamp Load (Amps)
Inductive Load
(Amps)
NC
NO
(Amps)
10
10
2
1.5
1
1
10
10
15
10
3
1
0.5
0.25
3
3
0.8
0.6
0.5
0.25
1.5
1.5
0.8
0.6
0.5
0.25
15
10
2.5
0.5
0.07
0.03
Switch functions
Switch no.
F777/778-012-018-050-070
F777/778-150
1
2
3
4
5
6
7
8
Close limit
Open limit
Close indication
Open indication
Close auxiliary
Open auxiliary
Close auxiliary
Open auxiliary
Open limit
Close limit
Open indication
Close indication
Open auxiliary
Close auxiliary
Open auxiliary
Close auxiliary
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page 4
Electric actuator accessories Figure 777/778
Accessories: electric
1 or 2 potentiometers.
Plan view with cover removed
Fig. 777/778-012-018
Plan view with cover removed
Fig. 777/778-050-070-150
Retrofit procedure
1 Remove O-ring and circlip (if fitted) from top of
camshaft.
2. Fit potentiometer assembly over camshaft with
gears upwards.
3. Fit spacing pillars between upper switch
bracket and potentiometer bracket, using M3
screws through the brackets and spacers and
M3 nuts located in the hexagon recesses on
the underside of the upperswitch bracket.
4. Fit potentiometer drive gear over the camshaft
to mesh with the potentiometer pinion. For dual
potentiometers, first turn both potentiometer
shafts fully clockwise to ensure that they both
operate in phase.
5. Set potentiometer’by operating actuator to fully
closed position, turning potentiometer drive
gear fully clockwise until mechanical stop is felt,
backing drive gear approximately 1/2 tooth,
and tightening M4 socket set screw to secure
drive gear to camshaft.
6. Refit O-ring and circlip to camshaft.
Note
Illustration shows typical potentio-meter. Other
types may be supplied within assembly.
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page 5
Electric actuator accessories Figure 777/778
Accessories: electric - 1 or 2 potentiometers
Operation specifications
Maximum power
dissipation
Temperature range
Maximum voltage
Insulation voltage
Resistance element
Resistance tolerance
Temperature
coefficient
Applications
1. Internal pot
2. External pot
:
:
:
:
:
:
2W at 70°C
-20°C to + 100°C
300V A.C. or D.C.
750V A.C.
cermet
± 10%
: 100 x 10-6/°K
Standard resistance ranges
- Always uses 50000hms. Used to give actuator positional
feedback to servo amplifier module or retransmission module.
- Used to drive remote position indicators.
- Used to give feedback of actuator position to external
control devices.
000000-
Voltmeter can be calibrated 0° - 90°
0°
span adjust
90°
Simple remote indication circuit
Pot 1
Pot 2
Hard-wired 2 ext. pots
Hard-wired
1 ext. pot
Electronic
1 ext. pots
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page 6
25000 ohms
5000 ohms
1000 ohms
500 ohms
135 ohms
100 ohms
Electric actuator accessories Figure 777/778
Accessories: electric
Current loop retransmission module.
Plan view with cover removed
Fig. 777/778-012-018
Potentiometer Gears
Plan view with cover removed
Fig. 777/778-050-070-150
Retrofit Procedure for Hard Wired
electric actuators
Drive Gear
Central
fixing
screws
Limit switch assembly
M3
fixing
screws
Limit switch assembly complete with Pot. Assy.
Note
For reverse acting output i.e. 20mA close and
4mA open, simply reverse the position of the
two potentiometer leads on the
retransmission terminal block -orange/black
to white/red position and vice versa.
1. Remove two central M3 fixing screws on
top of the limit switch assembly.
2. Locate retransmission module sub
assembly over same two holes with
terminal block to bottom.
3. Re-fit M3 fixing screws.
4. Fit 5K potentiometer.•
5. Connect potentiometer wiring to
retransmission module as per diagram
overleaf.
6. Connect red and blue single wiring,
supplied in kit, from retransmission module
to terminals 21 & 22 on main terminal
block.
• See potentiometer retrofit procedure for
fitting & setting.)
Retrofit Procedure for Hard Wired electric actuators
1. Slacken grub screw on potentiometer drive gear.
2 Remove three M3 fixing screws from potentiometer mounting plate.
3. Move gear/potentiometer assembly upwards on shaft as far as possible to allow access to
limit switch mounting plate.
4 Remove two central M3 fixing screws on top of the limit switch assembly.
5. Locate retransmission module sub assembly over same two holes with terminal block to
bottom.
6. Re-fit M3 fixing screws.
7. Fit new 5K potentiometer (no.2) thro’ spare hole on existing plate and fit gear/washers etc.
similar build to pot (no.1).*
8. Lower potentiometer assembly and gear down on top of three hex pillars and re-fit M3 fixing
screws.
9. Connect potentiometer wiring to retransmission module as per diagram overleaf.
10. Connect red and blue wiring with molex plug, supplied with kit, to socket behind customer
terminal block.
* See potentiometer retrofit procedure for fitting & setting.)
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page 7
Electric actuator accessories Figure 777/778
Accessories: electric - current loop retransmission module
Populated board
Ext. pot socket
Electronic units
Hard wired units
Operating specifications
Supply voltage
Output
:
:
Repeatability
Temp. stability
Power dissipation
:
:
:
Max. load
Temp. range
:
:
24V D.C. ± 20%
4 mA actuator closed,
20 mA actuator open
'± 1%
± 0.1% per degree C
0.5W at 20 mA
0.1W at 4 mA.
500 ohms
0°C to 40°C
Module setting procedures
1. Connect 24V D.C. supply as shown on wiring diagram and also connect a mA measuring
instrument in series with the supply.
2. Operate actuator to fully closed position.
3. Turn pots RV1 and RV2 fully anti-clockwise.
4. Adjust RV2 to give 3.6 mA.
5. Operate actuator to fully open position.
6. Adjust RV1 to give 20 mA.
7. Operate actuator to closed position and check that output is 4 mA and re-adjust RV2 if
necessary.
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page 8
white/red
24V D.C.
supply
green/red
Int, pot
orange/black
white/red
24V D.C.
supply
green/red
orange/black
Schematic diagram
Int, pot