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47DAC OPERATING MANUAL EM-9518-B Rev.4
1.7.7 WIRING ALARM OUTPUT (PHOTO MOSFET RELAY)
Four alarm contacts are output.
IMPORTANT
• Connect load within the specifications.
• With inductive load such like an external relay or a motor, insert a CR circuit (for AC or DC power), a diode (for DC
power) or a varistor (for AC or DC power) in parallel to protect the contacts and eliminate noise.
I/O options code: 3, 9
11
12
13
14
15
16
HHa
Ha
Hc, HHc
La
LLa
Lc, LLc
H
output
LL
output
L output
HH output
NOTE
Example of contact protection circuit with inductive load
Power
47DAC
Inductive load
Varistor
RC
circuit
Diode
C
R
■
DC powered
Power
47DAC
Inductive load
Varistor
RC
circuit
C
R
■
AC powered
U
U
*
It is effective to connect a varistor across a load with the supply voltage 24 to 28 V, and across a contact with 100 to 120 V.
