Electrical installation
4.9 Other connections
Drive converter cabinet units
Operating Instructions, 07/07, A5E00288214A
87
4.9.13
PT100 evaluation unit (option L86)
Description
Note
The PT100 evaluation unit and the parameters for the measurement channels are described
in the lug "Additional operating instructions".
The PT100 evaluation unit can monitor up to six sensors. The sensors can be connected in a
two or three-wire system. With the two-wire system, inputs Tx1 and Tx3 must be assigned.
With the three-wire system, input Tx2 must also be connected (x = 1, 2, ...6). The limit values
can be freely programmed for each channel. Shielded signal cables are recommended. If
this is not possible, however, the sensor cables should at least be twisted in pairs.
In the factory setting, the measurement channels are divided into two groups of three
channels. With motors, for example, this means that three PT100s in the stator windings and
two PT100s in the motor bearings can be monitored. Unused channels can be suppressed
via parameters.
The output relays are integrated in the internal fault and warning train of the cabinet unit. The
messages can also be picked up by the customer via two spare fault signaling relays. Two
user-programmable analog outputs (0/4 to 20 mA and 0/2 to 10 V) are also available for
integration in a higher-level controller. The power for the PT100 evaluation unit is supplied
and the evaluation itself executed within the converter.
In the event of a fault, the "external alarm 1" (A7850) and "external fault 1" (F7860) are
triggered.