Factory 5: Transformer Supervision With Pt100 - ABB CM-TCN Manual

4.1.5.

Factory 5: Transformer supervision with PT100

This profile allows transformer supervision with three escalation steps. Thresh-
old 1 is set to 130 °C and starts ventilation for cooling. If the threshold is reached
relay 1 trips. A cyclic switching function is assigned to relay 1 to periodically
switch the relay once per week for 15 minutes to keep the fan from clogging.
Threshold 2 is a pre-warning at 140 °C and trips relay 2. Additionally to the
threshold configuration the sensor error signals are assigned to relay 2 as well.
Threshold 3 is for the switch off at 155 °C.
Relays 1 and 3 operate in open-circuit-principle, relay 2 in closed-circuit-principle.
Automatic reset is active for all relays.
The operating logic and the settings are displayed in the block diagram:
STATUS
Approved
© Copyright 2020 ABB. All rights reserved.
SECURITY LEVEL
Public
S M ART T EMP ER ATUR E MONITORI NG R EL AYS
DOCUMENT ID.
2CDC112285M0201
REV. LANG. PAGE
B en 18/42