5.4
Setpoint Reference Signal
FMA 5400A/5500A flow controllers have built-in solenoid valve (FMA Series Max. Flow
10, 50 and 100 L/min), or motorized valves (FMA Series Max. Flow 200, 500 and 1000
L/min) allow the user to set the flow to any desired flow rate within the range of the par-
ticular model installed. The solenoid valve is normally closed (NC) when no power is
applied.
The motorized valve can be in any position depending on the operation mode of
the FMA 5400A/5500A during disconnecting of the power. power is applied for
the For example if the motorized valve was left in the OPEN purge position after
disconnecting power from the FMA 5400A/5500A it will be in the OPEN position.
It is the customers responsibility to provide a solution to shut down the flow in
case of a power outage. When power is applied to FMA Series Max. Flow 200,
500 and 1000 L/min models, the valve automatically closes within the first ten sec-
onds regardless of the set point and valve override signals.
Setpoints are controlled locally or remotely. Setpoints inputs respond to analog 0
to 5 VDC or 4 to 20 mA reference voltages (default jumper setting is 0 to 5 VDC).
Voltage is a linear representation of 0 to 100% of the full scale mass flow rate.
Response times to setpoint changes are 1 second (FMA Series Max. Flow 10
L/min ), 2 seconds (FMA Series Max. Flow 50 and 100 L/min) and 5 seconds
(FMA 200, 500 and 1000 L/min) within 2% of the final flow over 25 to 100% of full
scale.
For LOCAL flow control, use the built-in setpoint potentiometer located at the
same side as the solenoid valve of the FMA 5400A/5500A transducer. While
applying flow to the transducer, adjust the setpoint with an insulated screwdriver
until the flow reading is the same as the desired control point. [The display will
only show actual instantaneous flow rate. There is no separate display for set-
points.]
For REMOTE control of the FMA 5400A/5500A, an analog reference signal must
be supplied. On pin [11] of the FMA 5400A/5500A transducer is a regulated and
co5VDC output signal. This signal may be used in conjunction with a local
setpoint potentiometer for flow setting.
FIGURE 5-1
LOCAL SETPOINT POTENTIOMETER CONNECTIONS
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