Functions
2.36 Motor Starting Time Supervision (ANSI 48)
SIPROTEC, 7UM62, Manual
C53000-G1176-C149-7, Release date 03.2010
254
Under nominal conditions, the tripping time is the maximum starting time t
Start max
. For ratios deviating from
nominal conditions, the motor tripping time changes. At 80% of nominal voltage (which corresponds to 80% of
nominal starting current), the tripping time is for example:
After the delay time LOCK ROTOR TIME has expired, the binary input becomes effective and initiates a tripping
signal. If the blocked rotor time is set to a value that, in a normal startup, the binary input „>Rotor locked“
(No. 6805) is reliably reset during the delay time LOCK ROTOR TIME, faster tripping will be available during
motor starting under locked rotor conditions.
2.36.3 Settings
The table indicates region-specific presettings. Column C (configuration) indicates the corresponding second-
ary nominal current of the current transformer.
2.36.4 Information List
Addr. Parameter C Setting Options Default Setting Comments
6501 STARTUP MOTOR OFF
ON
Block relay
OFF Motor Starting Time Su-
pervision
6502 START. CURRENT 5A 0.50 .. 80.00 A 15.60 A Starting Current of Motor
1A 0.10 .. 16.00 A 3.12 A
6503 STARTING TIME 1.0 .. 180.0 sec 8.5 sec Starting Time of Motor
6504 LOCK ROTOR TIME 0.5 .. 120.0 sec; ∞ 6.0 sec Permissible Locked Rotor
Time
6505 I MOTOR START 5A 3.00 .. 50.00 A 8.00 A Current Pickup Value of
Motor Starting
1A 0.60 .. 10.00 A 1.60 A
No. Information Type of In-
formation
Comments
6801 >BLK START-SUP SP >BLOCK Motor Starting Supervision
6805 >Rotor locked SP >Rotor is locked
6811 START-SUP OFF OUT Starting time supervision switched OFF
6812 START-SUP BLK OUT Starting time supervision is BLOCKED
6813 START-SUP ACT OUT Starting time supervision is ACTIVE
6821 START-SUP TRIP OUT Starting time supervision TRIP
6822 Rotor locked OUT Rotor is LOCKED after Locked Rotor Time
6823 START-SUP PU OUT Starting time supervision picked up
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