Prevention Of Restarting - Fuji Electric FRENIC-HVAC User Manual

11.1.4.6

Prevention of restarting

To prevent the inverter from restarting just by turning the emergency stop button OFF, configure the
Enable input circuit as shown in Figure 11.9. Figure 11.10 shows the timing scheme for prevention of
restarting.
HLD ("Enable 3-wire operation") must be assigned to any digital input terminal; for example, setting the
E01 data to "6" sets up the HLD function at the [X1] terminal.
After the FWD comes ON with the HLD function being ON, even turning the FWD OFF keeps the
inverter running due to the HLD function. Turning the emergency stop button ON under the condition
causes the motor to coast to a stop. After that, turning the emergency stop button OFF no longer starts the
inverter to run. To run the inverter, turn the FWD ON again.
Safety relay unit complying with
EN ISO13849-1 PL=d Cat. 3 or higher
Reset
Emergency
stop button
*1 Digital input terminal (e.g., [X1])
*2 If SW1 is in the SOURCE mode, [PLC] applies; if in the SINK mode, [CM] applies
*3 Transistor output terminals (e.g., [Y1]-[CMY], DECF (Function code data=1101))
FRENIC-HVAC
[L1/R]
Power
[L2/S]
supply
[L3/T]
[FWD]
*1
[X1]
[PLC]
[PLC]
[EN1]
[EN2]
*3
[Do+]
*3
[Do-]
Figure 11.9 Connection Diagram and Internal Circuit Configuration
Figure 11.10 Prevention of Restarting
11-13
11.1 Compliance with European Standards
Output transistor
[U]
[V]
[W]
*2
6
Gate driver
6
CPU
M
3~