156 Options Emotron AB 01-4429-01r2
When the "Safe Stop" condition is achieved by using these
two different methods, which are independently controlled,
this safety circuit ensures that the motor will not start run-
ning because:
• The 24V
DC
signal is taken away from the "Inhibit"
input, terminals 1 and 2, the safety relay K1 is switched
off.
The supply voltage to the driver circuits of the power
conductors is switched off. This will inhibit the trigger
pulses to the power conductors.
• The trigger pulses from the control board are shut down.
The Enable signal is monitored by the controller circuit
which will forward the information to the PWM part on
the Control board.
To make sure that the safety relay K1 has been switched off,
this should be guarded externally to ensure that this relay did
not refuse to act. The Safe Stop option board offers a feed-
back signal for this via a second forced switched safety relay
K2 which is switched on when a detection circuit has con-
firmed that the supply voltage to the driver circuits is shut
down. See Table 37 for the contacts connections.
To monitor the "Enable" function, the selection "RUN" on
a digital output can be used. For setting a digital output, e.g.
terminal 20 in the example Fig. 114, please refer to section
11.5.4, page 124 [540].
When the "Inhibit" input is de-activated, the VSD display
will show a blinking "SST" indication in section D (bottom
left corner) and the red Trip LED on the Control panel will
blink.
To resume normal operation, the following steps have to be
taken:
• Release "Inhibit" input; 24V
DC
(High) to terminal 1
and 2.
• Give a STOP signal to the VSD, according to the set
Run/Stop Control in menu [215].
• Give a new Run command, according to the set Run/
Stop Control in menu [215].
Fig. 112 Connection of safe stop option in size B and C.
Fig. 113 Connection of safe stop option in size E and up.
NOTE: The method of generating a STOP command is
dependent on the selections made in Start Signal Level/
Edge [21A] and the use of a separate Stop input via
digital input.
WARNING: The safe stop function can never
be used for electrical maintenance. For
electrical maintenance the VSD should
always be disconnected from the supply
voltage.
Table 37 Specification of Safe Stop option board
X1
pin
Name Function Specification
1Inhibit +
Inhibit driver circuits of
power conductors
DC 24 V
(20–30 V)
2Inhibit -
3
NO contact
relay K2
Feedback; confirmation
of activated inhibit
48 V
DC
/
30 V
AC
/2 A
4
P contact
relay K2
5 GND Supply ground
6+24 VDC
Supply Voltage for oper-
ating Inhibit input only.
+24 V
DC
,
50 mA
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