APC AXFA11G - Manual (Page 18)

IM 01E20C01-01E 4-8
4. WIRING
᭹ Pulse Output
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,
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.
F0418.EPS
Mechanical Counter
Electronic Counter Load
Protective diode
30V DC, 0.2A. max
PULSE OUT
PULSE OUT
AXFA11
AXFA11
P+
P-
P+
P-
Figure 4.4.10 Pulse Output Connection
F0419.EPS
Protective diode
PULSE OUT
PULSE OUT
AXFA11
AXFA11
P+
P-
P+
P-
Output voltage: 24 V DC Ϯ 20%
• Current: 30 to 150 mA
Pulse rate: 0.0001 to 2 pps
Pulse width: 20, 33, 50, 100 ms
Mechanical Counter
Electronic Counter Load
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.
AXFA11
SI1 +
SI2 +
COM
F0420.EPS
No-voltage status input
Closed: Less than 200
Ω
Open: More than 100 k Ω
Figure 4.4.12 Status Input Connection