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Actuator status indication
The actuator microprocessor carries out a diagnostics when a failure has been
detected. The actuator status is indicated by the LED. When the microprocessor
detects that the stem has come to an unexpected stop it initiates a retry cycle, this is
repeated three times and if unsuccessful the actuator status is switched to fault
mode, the yellow LED blinks.
If the problem is cleared during the retry cycles, the actuator continues its normal
function.
Table 2: LED indications
Status
Green
Yellow
• Custom calibration value
out of range
Power on -
• Selfcalibration rejected.
On
motor still
Valve stroke out of limit
(<8, >25 mm).
Motor still.
• Temporary fault, possible
valve sticking
• Selfcalibration rejected.
Blink
Motor running
Valve stroke out of limits
(<8, >25 mm).
Motor running.
Fast blink Calibrating
Input signal failure
Off
* If the sticking cause is removed, the actuator leaves the temporary fault mode
pushing the calibration button for at least 5 s.
** The LED switches back to green when the temperature is back to the an allowed
temperature value.
Table 3: Feedback output
Input signal
0...10 V or 0...20 mA
2...10 V or 4...20 mA
Figure 8: Auxiliary Switches setting
(a). CAM for auxiliary switches.
The auxiliary switches can be adjusted by means of the two cams.
WARNING: Take care that auxiliary switches S1 and S2 are NOT
connected to different voltages (E.g. S1 230V and S2 24V NO!, S1
230V and S2 230V OK!).
Safety Warnings
• To prevent electric shock or damage to equipment, great care must be taken when
the cover is removed (by authorised personnel only) for adjustments or inspection.
In all other cases when the cover is removed, the power should be switched OFF.
This actuator is not equipped with a power supply switch. Therefore an additional
bipolar switch should be included in the power supply wiring to isolate the device.
• All wiring should conform to local codes and must be carried out by authorized
personnel only. Keep high and low voltage wiring separated.
When using multi-stranded wire apply a cable ferrule to the cable end.
• Make sure that the line power supply is in accordance with the power supply
specified on the device. Check all wiring connections before applying power to the
system. Short-circuited wires will result in permanent damage to the equipment.
24 VAC models must be powered through a class II 230/24V safety transformer and
appropriate fuse.
• Do not repair or replace a damaged cable, contact the nearest Johnson Controls
commercial system wholesaler.
• Do not open the actuator other then aux switches or feedback setting.
Check out procedure
Before leaving the installation observe at least three complete operating cycles to be
sure that all components are functioning correctly. If not, please contact your supplier.
Ordering Code
Code
Description
VA78x0-GGA-11
Proportional 24 V~, VG7000T valves
VA78x0-GGA-12 Proportional 24 V~, VGS8xxx / VG8000 / VG9000 valves
VA78x0-GGC-11
Proportional 24 V~, 2 auxiliary contacts, VG7000T valves
VA78x0-GGC-12 Proportional 24 V~, 2 auxiliary contacts, VGS8xxx / VG8000 /
VG9000 valves
LED color
Red
Generic fault
*
High temperature
Power off
Feedback output
0...10 V
2...10 V
IS_VA7820-VA7830_P/N 14-88375-25 Rev. A_06 2009
Technical Specifications
Product
Thrust Force
Power Supply
Power Consumption 11 VA
Ambient Operating
Conditions
Ambient Storage
Conditions
Feedback signal
Dimensions
(H x W x D)
Housing Material
Protection Class
**
Shipping Weight
Compliance
This document is subject to change without notice
VA7820 - VA7830 Electric Valve Actuators
Proportional models series
225 lb (1000 N)
24 V~ (19...30 V~) 50/60 Hz
-5...55 °C
10...90% RH (non condensing)
-40...80 °C
5...95% RH (non condensing)
0...10 V, with input signal 0...10 V or 0...20 mA
2...10 V, with input signal 2...10 V or 4...20 mA
231 x 115 x 212 mm
Self-extinguishing to UL94-V0
IP54 (IEC 60529)
3,3 Kg
CE Mark, EMC Directive 89/336/EEC,
Low Voltage Directive 73/23/EEC
2
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