Basler BE1-CDS220, Instruction Manual

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8-46 Application BE1-CDS220
Low Inertia Motor Start
Selecting the low inertia protection through virtual control switch 243 disables the 151P high inertia locked
rotor protection. When the breaker is closed, 250TP, start/run current detection, and 150TP low inertia
locked rotor protection, start timing. If the motor comes up to speed before time out of the 150TP element,
start is successful. If 150TP times out first, the motor is tripped through output 1. As described under high
inertia start, a motor could successfully start but still have abnormally high run currents. If 250TP, start/run
current detection times out, 150TP (low inertia locked rotor protection) is defeated and the same motor
overload protection discussed above takes over.
Emergency Trip
An external emergency trip as sensed at IN3 initiates a trip of the breaker through output 1 and seals the
trip path through V09. Virtual output 13 goes high which drives alarm bit #21 in the programmable alarm
mask. The breaker cannot be closed until the seal-in is cleared by the alarm reset key (ARSTKEY).
Alarms
Three logic variables drive the front panel LEDs: Relay Trouble (ALMREL), Major Alarm (ALMMAJ), and
Minor Alarm (ALMMIN). There is a fourth logic variable, Logic Alarm (ALMLGC), but there is no associated
front panel LED. When the relay self-test detects a problem in the relay (ALMREL) as programmed for the
MOTOR scheme, the Relay Trouble LED lights, output A operates, and all outputs are disabled. When a
Major Alarm is detected (ALMMAJ), the associated LED lights, but in this scheme, no output relay is
programmed to operate. When a Minor Alarm (ALMMIN) is detected, the associated LED lights, but in this
scheme, no output relay is programmed to operate.
Table 8-27. MOTOR Contact Input Logic
State Labels
Input Purpose Name Label
Closed Open
IN1
Optional input. Used for CT input circuit 1 breaker status
indication in SER reports. TRUE when breaker closed.
BREAKER-1 CLOSED OPEN
IN2
Speed switch, closed at rest. Used to block the 51S locked rotor
protection (for high inertia motors) during running. SPEED-
SWITCH-IN2
RUNNING STOPPED
IN3 Emergency trip. This is an optional input.
EMERG-TRIP-
IN3
TRIP NORMAL
NOTE
Tables 8-27 through 8-30 provide detailed logic definitions for the inputs, outputs,
protection, and control elements. Only those inputs, logic blocks, virtual switches,
and outputs in use for the MOTOR preprogrammed logic are described in the
following Tables.