Kikusui PWX1500H, Руководство пользователя

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74
PWX
Controlling the Clearing of Alarms
This section explains how to use an external contact to clear alarms.
To reduce the influence of noise on the output, connect a 2-core shielded wire or a twisted-
pair wire across the external contact, and keep the wire as short as possible. If the wiring is
long, it becomes easy for noise to influence the operation of the PWX series. Even if you use
wires that are designed to suppress noise, the PWX series may not operate properly.
If you use a shielded cable, connect the shield to the negative output terminal.
If you apply a LOW (0 V to 0.5 V) or short-circuit to pin 5 of the J1 connector, the alarms will
be cleared.
Alarm clear connection
Use pins 5 and 19 of the J1 connector.
The open-circuit voltage across pins 5
and 19 is approximately 5 V. The short-cir-
cuit current across pins 5 and 19 is
approximately 0.5 mA.
Use external contacts that have a contact
rating greater than or equal to 0.5 mA at 5
Vdc.
If two or more units are floating, and you are using a single external contact to clear alarms,
use a relay or similar device for the external contact signal to isolate the signal transmitted to
each unit.
 For long-distance wiring
When you are wiring over a great distance,
use a small relay and extend the coil side of
the relay.
WARNING
Risk of electric shock.
• The insulation of the external contact (S) and the connected cable must be greater
than or equal to the isolation voltage of the PWX series.
For the isolation voltage of each model, ”Specifications” on page 93.
• When using shielded cables for the connection, protect the uncovered sections of
the shielded cable by using insulation tubes whose withstand voltage is greater than
the PWX series isolation voltage.
2-core shielded wire or
twisted-pair wire
Output terminals
J1
5
19
PWX
S
S
Extend this line.
Relay