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“Power+” +0500048IE - rel 2.2 - 06.11.2014
ENG
Safety digital input
Connect the “Safe Torque Off ” digital input to a safety device (for example, a maximum pressure switch) with normally
closed voltage-free contact, in series with an external 24 Vac/24 Vdc voltage source, without needing to observe
the polarity for direct current (ref. A). When the contact is open, the drive stops operating, bypassing the software
control. If the Safe Torque Off function is not used, the input must be connected to the auxiliary 24 Vdc available on
the terminal block, so as to enable correct operation of the drive (ref. B).
Dispositivo di sicurezza NC
NC Safety device
24 Vdc
9 (STOa)
10 (STOb)
24 Vac
A
7 (24 Vdc)
8 (0 V)
9 (STOa)
10 (STOb)
B
Fig. 3.n
Note:
IEC61508 requires that the power supply applied to the safety input is isolated from the drive.
Serial network connection
For the serial connection use a three-wire shielded cable. For large networks, install a 120 ohm ¼ W resistor between
terminals 4 and 5 on the last drive or device connected, to avoid possible communication problems.
p
CO
/ building management system
RS485
Schermo
Shield
R = 120 ohm
Power +
3 4 5
GND
T
x/Rx+
T
x/Rx
-
0 V
T
x/Rx+
T
x/Rx
-
Power +
3 4 5
0 V
T
x/Rx+
T
x/Rx
-
Fig. 3.o
