Julabo Presto Plus LH 47, Руководство по эксплуатации

Страница: 63 / 76

63
1
2
3
AK
STAND-BY
Stand-by input (3.2)
(for external emergency switch-off)
Pin assignment:
Pin Signal
1 not connected
2 5 V / DC
3 0 V
Use shielded cables only.
Activate the stand-by input:
•
Under menu item Stand-by, set the parameter to "yes"
(see page 44).
•
Connect an external contact 'AK' (e.g. for emergency switch-off) or
an alarm contact of the superordinated system.
In case the connection between Pin 2 and Pin 3 is interrupted by
opening the contact 'AK', a complete shutdown of the circulation pump
and heater is effected, and the unit enters the condition "OFF".
As long as the contact remains open, line 4 of the DIALOG-DISPLAY
(LCD) flashes and displays the message "STAND-BY".
If the contact is reclosed, the instrument returns to the stand-by state
and "OFF" is displayed.
Additional tips for using the STAND-BY input:
The stand-by function can be used in conjunction with the
AUTOSTART feature (see page 44)
1. If the Autostart function is NOT turned ON, the stand-by input should
be used as described above.
2. If the Autostart funcion is enabled, the instrument will revert back to
the original method of entering the setpoint (i.e. keypad, RS232,
Analog input, etc.).
•
Entering the setpoint with the keypad.
As described above, a bipolar shut-down is accompanied by the
"STAND-BY" display and the OFF state. The programmable
controller starts again when the contact is reclosed. The
temperature of the bath liquid changed during the STAND-BY state.
•
Entering the setpoint with the programmer (see pages 47 and 49).
The display "STAND-BY" appears. The setpoint value and the time
are both held at the current value. The temperature of the bath liquid
will be held constant at this temperature. The programmer continues
once the contact is reclosed.
Warning: this is not an actual shutoff feature.
AK
1
2
3
STAND-BY