52 M OT O R CO N TR O L A N D P R OT E C TI O N U N I T M 10X U S ER G U I D E
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41 PTC protection
The resistance of PTC input is compared against
the alarm level. When resistance of PTC input
exceeds above the alarm level, a PTC alarm
message is issued.
The resistance of the PTC input is compared
against the trip level. When resistance of PTC in-
put is above the trip level PTC trip alarm is is-
sued and the contactor tripped.
After PTC trip is executed, the resistance of PTC
input is compared against the PTC reset level.
When resistance of PTC input decreases below
the reset level, the PTC protection function
executes the function set by PTC reset mode.
When the resistance of PTC input exceeds 12kΩ, a
PTC open circuit alarm message is issued.
Short circuit and open circuit detection threshold
have no fault time delay. The short circuit and
open circuit protection is enabled when PTC
protection is enabled, and cannot be disabled.
If the measured resistance is over
""
The distance between PTC sensors and M10x PTC
measuring inputs cannot exceed the following to
be able to maintain reasonable reading:
Cross section Length
2.5mm
2
2x250m
1.5mm
2
2x150m
0.5mm
2
2x50m
M10x provides short circuit and open circuit
detection for the temperature sensing element.
Short circuit alarm level is settable, and open
circuit alarm level is fixed. When the resistance
of PTC input falls below short circuit alarm level,
a PTC short circuit alarm message is issued.
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