Owner manual

11
IM 12B07C05-01E
3 INSTALLATIONANDWIRING
3-4. Wiring the contact signals
3-4-1. General precautions
The contact output signals consist of volt-
age-free relay contacts for switching electrical
appliances(SPDT).Theycanalsobeusedas
digital outputs to signal processing equipment
(suchasacontrollerorPLC).Itispossibleto
use multi-core cables for the contact in and
output signals and shielded multi-core cable for
the analog signals.
3-4-2. Contact outputs
The EXAxt 450 unit’s four contacts (switches)
that can be wired and configured to suit user
requirements.ContactS4isprogrammedas
a fail-safe contact. Please refer to section 5-8,
Contact output setup for functionality descrip-
tion.
Alarm (limits monitoring)
Contactsconfiguredas“ALARM”canbeener-
gized when limits are crossed.
Fail
Contactsconfiguredas“FAIL”willbeenergized
whenafailsituationoccurs.Somefailsitua-
tions are automatically signaled by the internal
diagnostics (electronics) of the converter.
Otherscanbeconfiguredbytheuser(see
section 5-11 Error Configuration). By pressing
the“INFO”buttononthemainscreentheuser
is given an explanation as well as a remedy for
the current fail situation.
Always connect the fail contact to an alarm
device such as a warning light, alarm bell or
displayed on an annunciator.
“ALARM” Contact “FAIL” Contact
PowerOff NC NC
PowerOn NC NC
Alarm NO NC
Fail NC NO
FailandAlarm NC* NO
HOLD** NC NC
* Whenafailsituationoccurswhichisrelated
to the parameter associated with the contact
(pH,ORP,rHortemperature)thecontact
will go to NC. When the fail situation is not
related to the parameter associated with the
contact the contact will remain in the state it
is currently in.
**Washcyclesdonotinfluenceothercontacts.
WhenHOLDisenabledduringwash,itis
HOLDthatwillsetallcontactstoNC.
3-4-3. Contact input
It is necessary to use screening/shielding on
the input signal cables. Terminal 63 is used to
connect the shielding.
3-5. Wiring the mA-output signals
3-5-1. General precautions
The analog output signals of the EXAxt
transmit low power standard industry signals to
peripherals like control systems or strip-chart
recorders(Figure3-6).
3-5-2. Analog output signals
The output signals consist of active current
signals of 4-20 mA. The maximum load can be
600 ohms on each.
It is necessary to use screening/shielding on
the output signal cables. Terminal 63 is used to
connect the shielding.
Figure 3-8-a. External grounding Figure 3-8-b. Internal grounding
2
N
1
L
POWER
100-240 VAC/15 VA/ 50/60Hz
FUSE: 500 mA/250 VAC/T
AC
(M4 screw)
(M4 screw)