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Temperature converter with trip relays KF**-GUT-(Ex)1.D
Editing devide data: Relays
8.5.3 Switching point and hysteresis
Be aware of the following when entering the switching point and hysteresis values:
•
The following rule applies if the assignment Ch1 has been selected (see section 8.5.1):
− Both values must be specified in the unit selected under Unit (see section 8.3).
− The input limits of the switch point depend on the measuring range of the selected sensor (see
section 8.9).
•
The following rule applies if the assignment Trend has been selected (see section 8.5.1):
− Both values must be specified as unit/sec. (e.g. °C/sec).
− For all units except for mV, you can select a switching point between -100 unit/sec and +99.00
unit/sec ; for mV, you can select a value in the range from -10.0 mV/sec to +9.900 mV/sec.
•
The hysteresis value must be high enough to avoid flickering of the relays (reference value: > 1 %
of the measuring range).
•
As illustrated in the representation of the switching behaviour in section 8.5.2, the Max switching
direction requires that the switch point hysteresis value ≥ is the switch point lower limit. With the
Min switching direction, the value must be the switch point + hysteresis ≤ switch point upper limit.
These limitations are automatically specified by the GUT.
8.5.4 Error signal
The illustration below shows two menu levels subordinate to the Error signal menu item. Menu items
of the lowest menu level are displayed in a bold frame.
If the Error signal function has been enabled (On) and you press the OK key, the program guides you
from the Error signal menu item to the Restart inhibit menu item. If you reactivate the Error signal
function (see section 8.5) and press the OK key twice, the Restart inhibit menu item is available.
Error signal (On) —— Restart inhibit (see below) ——
A relay with the Error signal function is picked up in the normal mode. If the device detects a fault
(see section 6), the relay drops out.
Subject to reasonable modifications due to technical advances.
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