Wire the motor with three-phase lines through the two contactors.
Coil ends A1 and A2 of the safety relay are wired with a 230 volt single phase supply
through the 2 pole switch.
SAFETY RELAY OPERATION MANUAL
The supply voltage for this particular safety relay must be between 48-240V AC or DC
“S21” terminal must be connected to ground.
Input circuits, start / reset circuit and feedback loop are powered by 24V DC.
Joining "S11" and "S12" together will activate input channel 1, which in turn operates the
internal contactor "K1".
Joining "S21" and "S22" together will activate input channel 2, which in turn operates the
internal contactor "K2".
“Y32” is for the PLC input terminals.
Connect “S11” and “S12” terminals wiring through one set of “NC” on the e-stop switch.
Connect “S21” and “S22” through the other set of “NC” to enable input channel 2.
Reset switch needs to be wired between “S12” and “S34” terminals and also required
to go through the two “NC” contact points on the two contactors.
Terminals 13-14, 23-24, and 33-34 are safety contacts which can be used to operate
equipment safely.
Output contact points 41-42 is an auxiliary contact, which can be used only for display
purposes.
Take 230V phase wire through terminals 13 and 14, and connect it to the A1 terminals
of the two contactors.
Connect neutral line to the A2 terminals.
Connect control phase line to the indicator lamp, through the terminals 41 and 42.
Connect neutral line to operation of this circuit.
Switch on the 4 pole breaker first.
Master relay receives 3 phase power now.
When the control circuit breaker is on, terminals A1, 13, and 41 receive power and the
Power L E D is now on. At the same time, the "NC" auxiliary contact point 42 releases
power to the display lamp on the panel board, and shows that the output power of the
safety relay is still off. If the “N C” contacts on emergency stop switch are closed, input
channel 1 is activated through the closing of the terminals S11 and S12.
At the same time, input channel 2 is also activated via terminals S21 and S22.
Now you can start the safety operation by pressing the reset button, which intern
passes
24 volts “D C” power to terminal “S34” from terminal “S12”.
Actually reset “L E D” indication light comes on, when “S34” is supplied with
24 volts. This will activate inner contactors K1 and
K2, allowing normally open contacts at 13-14, 23-24, and 33-34 to close.
So, the L E D indicator for the output is now on, and terminal 14 sends 230 volt control
power to the motor run contactors. Before the reset button is released, the reset
light goes out, because the start loop is now disturbed, through the opening of the
"NC" contacts on the contactors. Also the motor starts running now, as the
contactors are with the control power on. Further, terminal 42 has no power now, so
the output shutdown light is off. If you press the emergency stop button now,
input channels 1 and 2 are deactivated. The L E D lights for those two channels are
off now. Terminal 14 is no longer receiving 230 volts,
so both contactors cut 3-phase power to the motor.
Terminal 42 receives power at the same time, and lights the indicator lamp on the panel
board. Fault indicating red L E D will not light
up here, because both input channels are turned off simultaneously.
The operation can start again, by first resetting the emergency stop button, and then
pressing
the reset button. Let's see another operating condition of the
emergency stop switch now. Here you can see that, the upper "N C" contacts
have a welded condition. Input channel 1 is deactivated here, because
the lower “N C” contacts have opened up correctly.
So the output turned off, and the motor comes to a safe stop without any problem.
But the fault indicating red L E D has now lit up, since input channel 2 did not turn
off simultaneously. Also, you will see, that the LED light indication
on input channel 2 is now flashing, with the red LED fault indication lit up continuously.
The system cannot be reset, until you correct the fault on input channel 2, by replacing
the faulty emergency stop switch with a good one.
Also, if any contactor on the output side has a faulty condition due to contact welding;
it will not be possible to reset the safety relay.
Since the reset loop is connected via the "N C" contact points on the output side
contactors,
any open "N C" contact in the loop will prevent resetting of the safety relay.
So you need to attend to the fault and replace the faulty contactor, before resetting the
safety system back to normal.