Intelligent Technologies (IT.) QSNAP
10 Pub. No. MN05001001E
February 2002
Enhanced Features
The QSNAP offers a variety of enhanced features, including: settable warnings, current
threshold warning, underload warning and reset. To help diagnose an application, a fault
queue is provided to view the last five faults.
Refer to the following two tables for definitions of the QSNAP Enhanced Features and
Threshold Features.
Table 8: Standard Features
Table 9: Enhanced Features
Note: The threshold values for Thermal Overload and Phase Current Unbalance can not be
modified.
Fault Definition
Phase Current
Unbalance/Phase Loss
A phase current unbalance trip will occur if one or two of the line currents are
40 – 60% or less of the remaining line(s) for longer than 10 seconds.
A phase loss trip will occur with a load current of at least 75% of the minimum
FLA if one of the two input line voltages is lost, with the line current going to
zero for longer than 10 seconds.
Thermal Overload While the motor is running and depending on the FLA and trip class settings,
when the FLA is exceeded for a period of time (depending on the trip class
setting), a thermal overload trip will occur. For more information on this
feature, see the IT. Contactor and Starter User Manual (Publication No. 49400).
Fault Definition
Ground Fault With the addition of a Ground Fault module, the QSNAP will trip when the
module detects a ground fault. To set the level of the trip, a setting is adjusted
on the Ground Fault Module. The Ground Fault Module is connected to the
QSNAP through the Auxiliary opening on the face of the QSNAP.
Underload Warning While the motor is running, a warning will be activated when the current falls
below a user settable % of FLA.
Current Threshold
Warning
While the motor is running, a warning will be activated when the current rises
above a user settable % of FLA.