Temperature System Magnum 91
61
AK
1
2
3
STAND-BY
AK
1
2
3
STAND-BY
STAND-BY input
(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 40).
•
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 40)
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 43 and 45). 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.
