Ptc Thermistor Relays; Abb Cm-Mss.41 Thermistor Motor Protection Relay; Layout - ABB ACS880 Series User Manual

22 ATEX-certified motor thermal protection function with PTC thermistor relays (+L513+Q971)

PTC thermistor relays

The ATEX-certified motor thermal protection function contains one (+L513) or two (+2L513)
ABB CM-MSS.41 thermistor relay(s) by default. Three ABB CM-MSS.41 thermistor relays
(+3L513) are available as an order-based engineered option.
DOLD MK 9163N.12/110-ATEX thermistor relay(s) are available as an order-based
engineered option.
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ABB CM-MSS.41 thermistor motor protection relay

Layout

LEDs Indication of operational states
"U" LED (green) Supply voltage present
"F" LED (red) Fault message (overtemperature, broken wire, or short-circuit in the measurement circuit)
"R" LED (yellow) Output relay status
DIP switches
Position 1
ON Not in use
OFF (default) Not in use
A1-A2 Power supply
T1-T2 Measuring circuit with 1...3 sensors
S1-T2 Remote reset push button switch
Note: Although autoreset of the relay can be implemented
by connecting these terminals together, this is not recommen-
ded when used in the protection function of an Ex motor.
11-12/14 Output contacts (1)
• 11: Common
• 12: Normally-closed
• 14: Normally-open
21-22/24 Output contacts (2)
• 21: Common
• 22: Normally-closed
• 24: Normally-open
Test / Reset Fault reset button
Reset: only possible if the measured value is less than switch-
on resistance.
Test: only possible when there is no fault.
2
Not in use
Not in use
3 4
Short-circuit detec- Non-volatile fault
tion de-activated storage de-activated
Short-circuit detec- Non-volatile fault
tion activated storage activated