Toshiba 48-1250 A 用户手册
TOSHIBA- 11
TX Series
48 - 1250A
2.8.2 Two-Wire Connection
An alternate connection for unattended operation replaces start/stop push
buttons by connecting a maintained contact closure between pins 3 and
5 on TB4. When the maintained contact is used for start/stop it is
necessary to set the overload setpoint to the manual reset position.
This will prevent the motor from restarting if the thermal overload trips
and then cools off.
buttons by connecting a maintained contact closure between pins 3 and
5 on TB4. When the maintained contact is used for start/stop it is
necessary to set the overload setpoint to the manual reset position.
This will prevent the motor from restarting if the thermal overload trips
and then cools off.
When two-wire connection method is used, the start
circuit must be interlocked to prevent automatic
restart when either of the two protective devices
(overload or thermostat) reset. Thermostats always
automatically reset on cool down.
circuit must be interlocked to prevent automatic
restart when either of the two protective devices
(overload or thermostat) reset. Thermostats always
automatically reset on cool down.
2.8.3 Programmable Relays/Relay Contacts
All the relay contacts are FORM C (Com, N.O., N.C.). Toshiba recommends
fusing all contacts with external fuses. The TX has four programmable relays
on TB3 on the power board. The relays are rated for 240Vac, 5 A and 1200
VA. These relays can respond to either a fault condition or an up-to-speed
condition. In the TX all tripping functions have been assigned to the TRIP
(AUX1) relay, and all alarm (warning) condition has been configured to the
ALARM (AUX2) relay. AUX 3 is factory programmed for a SHUNT TRIP
indication and can be connected to a shunt trip coil on an incoming circuit
breaker or open an input isolation contactor. AUX4 is the AT SPEED contact.
When the motor has reached the end of its acceleration ramp, the TX will
wait until the AT SPEED programmed time delay has expired. Then, the
relay will energize until a stop command has been received. The AT SPEED
contact can be used to operate a bypass contactor (used for shorting the
load current around the SCRs. To change AUX3 or AUX4 functions, see
Setpoint Page 4.
fusing all contacts with external fuses. The TX has four programmable relays
on TB3 on the power board. The relays are rated for 240Vac, 5 A and 1200
VA. These relays can respond to either a fault condition or an up-to-speed
condition. In the TX all tripping functions have been assigned to the TRIP
(AUX1) relay, and all alarm (warning) condition has been configured to the
ALARM (AUX2) relay. AUX 3 is factory programmed for a SHUNT TRIP
indication and can be connected to a shunt trip coil on an incoming circuit
breaker or open an input isolation contactor. AUX4 is the AT SPEED contact.
When the motor has reached the end of its acceleration ramp, the TX will
wait until the AT SPEED programmed time delay has expired. Then, the
relay will energize until a stop command has been received. The AT SPEED
contact can be used to operate a bypass contactor (used for shorting the
load current around the SCRs. To change AUX3 or AUX4 functions, see
Setpoint Page 4.
Relay Contacts on Power Board
Rated 240Vac, 5A, 1200VA
Two-Wire Connection
WARNING