APC AXFA11G user manual Pulse Output, Status Input

Pulse Output

4. WIRING

IMPORTANT

• As this is a transistor contact (insulated type),

give attention to proper voltage and polarity

when wiring.

• Do not apply a voltage larger than 30V DC or a

current larger than 0.2A in order to prevent

damage to the instrument.

• When input filter constant of the electronic

counter is large in relation to the pulse width,

AXFA11

P+

PULSE OUT P-

AXFA11 P+

PULSE OUT P- Load

Output voltage: 24 V DC 20%

•Current: 30 to 150 mA

Pulse rate: 0.0001 to 2 pps

Pulse width: 20, 33, 50, 100 ms

Protective diode

Mechanical Counter

Electronic Counter

the signal will decrease and the count will not

be accurate.

• If the input impedance of the electronic counter

is large, an induction noise from the power

supply may result in inaccurate counts. Use a

shield cable or sufficiently reduce the input

impedance of the electronic counter within the

electromagnetic flowmeter pulse output specifi-

cation range.

• The active pulse output (Optional Code EM)

cannot be used in conjunction with the standard

pulse output.

• When the active pulse output (Optional Code

EM) is selected, do not be short-circuit between

the P+ and P– terminals to avoid damaging the

instrument.

• When the active pulse output (Optional code

EM) is selected, the range of pulse rate must

be set to 2 pps maximum.

• To avoid communication (BRAIN/ HART)

failure, it is recommended to use the shield

cable.

AXFA11		Protective diode
	P+
PULSE OUT	P-	Mechanical Counter
AXFA11	P+
PULSE OUT	Load	Electronic Counter
	P-
	30V DC, 0.2A. max
		F0418.EPS

Figure 4.4.10 Pulse Output Connection

F0419.EPS

Figure 4.4.11 Active Pulse Output (Optional code EM)

Status Input

IMPORTANT

Status inputs are designed for use with no- voltage (dry) contacts. Be careful not to connect the status to any signal source carrying voltage. Applying voltage may damage the input circuit.

Closed: Less than 200 Ω

Open: More than 100 kΩ

AXFA11

SI1+

SI2+

COM

No-voltage status input

F0420.EPS

Figure 4.4.12 Status Input Connection

4-8 IM 01E20C01-01E