ABB CM-MSS.33 Sicherheitshinweise - Seite 10

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Monitoring functions

The thermistor motor protection relay CM-MSS monitors the

winding temperature and thus protects the motor from

overheating, overload and insufficient cooling.

For this the motor has to be equipped with PTC resistor

sensors type A. If the motor heats up excessively (sensor

resistance > 2.83 kΩ, CM-MSS.12/13/22/23: > 2,7 kΩ), the output

relays de-energize. A reset is only possible after cooling down

of the motor (sensor resistance < 1.1 kΩ, CM-MSS.12/13/22/23:

< 1,2 kΩ).

Short-circuit detection

(CM-MSS.21/31/32/33/41/51)

If a short circuit is detected between the two lines of a sensor

circuit, the output relays de-energize.

Dynamic interrupted wire detection

(CM-MSS.11/21/31/32/33/41/51)

During the operation the device is permanently monitoring the

measuring circuit. If the resistance in the measuring circuit is

changing, the device recognizes on the basis of the velocity of

change if there is a interrupted wire. Then the output relays de-

energize.

Test function

(CM-MSS.31/32/33/41/51)

is only possible when there is no fault.

By pressing the front-face combined Test / Reset button a

system test routine is executed.

CM-MSS.41/51: If the function „Remote Test / Reset" (DIP

switch 4) is activated, the system test routine is also possible

via control input S1-T2 (CM-MSS.41) or S1-1T2/2T2 (CM-MSS.51).

After starting the test routine the output relays de-energize.

They remain de-energized until the Test / Reset button is

pressed again or control input S1-T2 (CM-MSS.31/32/33/41) or

S1-1T2/2T2 (CM-MSS.51) is closed (remote reset).

Reset (CM-MSS.11/12/13/21)

Once the fault has been rectified and the measured value has

dropped below the release threshold, an automatic reset is

executed.

Reset (CM-MSS.22/23/32/33)

After rectification of a fault, the device has to be reset. This

reset can be made manually by the Reset button, automatically

by jumpering S1-T2 or externally by a remote reset between

S1-T2.

Fault storage and reset (CM-MSS.31)

The fault storage is designed as non-volatile (remanent). After

switch-off and return of the control supply voltage the device

returns to the state it was prior to the switch-off.

If prior to the interruption of control supply voltage there was

no fault, the device restarts automatically after re-applying

control supply voltage.

If there was a fault prior to the interruption, reset can be made

manually by the Test / Reset button, automatically by

jumpering S1-T2 or externally by a remote reset between S1-T2.

Fault storage f and reset (CM-MSS.41/51)

The fault storage is designed as non-volatile (remanent). This

means that after switch-off and return of the control supply

voltage the device returns to the state it was prior to the

switch-off.

If prior to the interruption of control supply voltage there was

no fault, the device restarts automatically after re-applying

control supply voltage.

If there was a fault prior to the interruption, reset can be made

manually by the Test / Reset button or externally by a remote

reset between S1-T2 (CM-MSS.41) or S1-1T2/2T2 (CM-MSS.51).

With deactivated fault storage reset can be made manually by

the Test / Reset button, externally by a remote reset between

S1-T2 (CM-MSS.41) or S1-1T2/2T2 (CM-MSS.51) or automatically

by jumpering S1-T2 (CM-MSS.41) or S1-1T2/2T2 (CM-MSS.51).

Single and accumulative evaluation (CM-MSS.51)

Single evaluation

If a fault occurs in the measuring circuit 1, output relay 1 (11-

12/14) de-energizes. If a fault occurs in the measuring circuit 2,

output relay 2 (21-22/24) de-energizes.

Accumulative evaluation

In case of a fault in one of the two measuring circuits, both

output relays de-energize synchronously.

All operating states are signaled by the front-face LEDs.

See table „LEDs, status information and fault messages".

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