Level Pro ITC 450 User Manual page 16

ITC 450/470
User manual
The connection circuit should not be changed while unit is powered. While using TC, RTD or voltage
inputs (0-150mV) the device is able to detect wire breaks. Wire breaks are detected within about 2
seconds. For connectors number 32 and 33 of RTD input it may take up to about 7 seconds. During
detection measurements will be incorrect. If wire break is detected "S.Err" (sensor error) message is
displayed.
Contacts of relay outputs are not equipped with spark suppressors. While use the relay outputs for
switching of inductive loads (coils, contactors, power relays, electromagnets, motors etc.) it is required to
use additional suppression circuit (typically capacitor 47nF/ min. 250VAC in series with 100R/5W resistor),
connected in parallel to relay terminals or (better) directly on the load. In consequence of using the
suppression circuit, the level of generated electromagnetic disturbances is lower, and the life of relay
contacts rises.
www. levelprosales.com www. levelprosales.com
14