28
45
03
20
15
-09
19
Temperature Trip Amplifier KFD2-GU-(Ex)1
Working with Device Data
The following parameters can be set:
•
Switching point
and
hysteresis
for relay 1 and relay 2; the unit is displayed according to the selection
for
Parameter Input
(see section 7.2). The hysteresis should be selected as > 1 % of the
measurement range to avoid causing the relay to flutter.
•
Switching direction
(
MAX
or
MIN
) and
mode of operation
(
energised
or
de-energised
) for relay 1 and
relay 2
• The
Error Output
function for relay 2 is not available until firmware version 3.0.
•
Alarm Freeze
: when Alarm Freeze is selected, the Relay State is kept after trip or Fault Alarm until
the device is restarted (Power Off-On)
7.4 Switching Behaviour of the Relays
Available settings for the switching direction are
MIN
and
MAX
; available settings for the mode of
operation are
energised
and
de-energised
.
Range of application (see also figure on page 20):
• Switching direction MAX, mode of operation energised:
Alarm when limit value is exceeded, for example horn on
Protection against overheating, for example cooling on
• Switching direction MAX, mode of operation de-energised:
Protection against overheating, for example heater off;
with large hysteresis MIN-MAX operation, for example heater on/off
• Switching direction MIN, mode of operation energised:
Alarm when value falls short of lower limit, for example horn on
Protection against cooling too cold, for example heater on
• Switching direction MIN, mode of operation de-energised:
Protection against cooling off too cold, for example cooling off;
with large hysteresis MIN-MAX operation, for example cooling on/off
