21
MODULATION CONNECTION FOR VOLT FREE SWITCH MODE
When connecting to a volt free switch (float switch for example) that requires the actuated valve to close
on the switch circuit connection made, and open when the switch connection is broken, it can be config-
ured through the modulation feature when activated and simple 2 core wiring connection from the volt
free switch connected back to the Analogue input connections (0
-
10v Out) & (0
-
10v In) on the 5
pin Analogue Input Connection.
WIRING FOR MODULATING
“
PROPORTIONAL CONTROL
”
FUNCTIONALITY
(CONTINUED)
In modulating mode, the RIFT® 200 proportional controller (positioner) enables the actuator to
automatically position a valve in proportion to an analogue current or voltage control signal. A signal
derived from the actuator
’
s non
-
contacting 10bit position sensor is automatically compared with a signal
proportional to the input position. If a difference exists an open or close command to cancel the
difference/error is generated by the EPS. The valve
’
s position is therefore automatically adjusted in
proportion to the analogue signal.
The external power supplied through the 10
-
way Molex connector is used as external power supply for
the battery, Bluetooth and the anti
-
condensation heaters only and will not control the movement of the
Valve & Actuator when Analogue Signal Control is selected, this is primarily used as a charging circuit.
Unnecessary frequent movement instigated by a constantly fluctuating input signal is dampened by
averaging formulae within the EPS programme to prevent the motors running continuously.
Input signal options:
0
-
10v DC, 0
-
20mA, 4
-
20mA
-
Output signal options:
0
-
10v DC, 0
-
20 mA, 4
-
20 mA
EFFECT OF LOSS OF CONTROL SIGNAL FOR MODULATION:
FAILSAFE MODULATING FUNCTION (EPS) ELECTRONIC POSITIONING SYSTEM
Including Battery Failsafe System (EPS+BFS)
In standard modulating mode the RIFT®40
-
100 V2 will stay put on external power failure. The RIFT® 200
can however be configured for failsafe modulating functionality, where it will be driven to a pre
-
determined position should external power be lost. This is achieved by combining the modulating and
battery failsafe systems, selected both
‘
Failsafe
’
and
‘
Analog Control
’
in the Bluetooth User Interface.
Effect of loss of external power with failsafe enabled:
Configuration options
Position at low
signal
Position on loss of
control signal
Position at high
signal
Position on loss of
control signal
Standard acting (default)
CLOSED
CLOSED
OPEN
CLOSED
Reverse acting ( option)
OPEN
CLOSED
CLOSED
OPEN
Configuration options
Position at low
signal
Position on loss of
POWER
Position at high
signal
Position on loss of
POWER
Standard acting (default)
CLOSED
OPEN
Reverse acting (option)
OPEN
CLOSED
