Eaton Moeller Series, Руководство пользователя

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Engineering
10
10/12 MN04913001Z-EN
Average diagnostic
coverage DC
avg
Disconnection in the event of a hazardous situation is imple-
mented from two units that are included in the calculation as
parallel channels:
• Channel 1: contactor,
• Channel 2: series connection of the CMD and under-
voltage release of the motor-protective circuit-breaker/
circuit-breaker.
The mirror contacts used allows a DC
avg
= 99 % to be
applied to channel 1.
For channel 2 the DC
avg
for the CMD was calculated at DC
avg
= 90 %. The undervoltage release can be estimated a DC
avg
= 60 % provided that regular inspections are carried out.
h
Two CMD relays are required in reversing starter circuits.
To attain category 3, faults were excluded by wiring inside
a control cabinet.
On disconnection via the undervoltage release, a time
delay of 100 ms
G
20 % can occur.
An enable circuit must be protected with a max. 2 A gG/
gL fuse to protect the internal relay contacts.
h
The function of the undervoltage release must be tested
manually at regular intervals.