System Manual HS3A-H21M4
12
Electrical Connection
The following connection options are available:
Separate operation
Series connection with Y-distributors from IDEC
Series connection, e.g. with wiring in the control cabinet
Warning!
In case of an error, loss of the safety function through incorrect connection.
To ensure safety, both safety outputs (OA and OB) must always be evaluated.
Monitoring output (OUT) must not be used as safety outputs.
Lay the connection cables with protection to prevent the risk of short circuits.
Caution!
Risk of damage to equipment or malfunctions as a result of incorrect connection.
Do not use a control system with pulsing or switch off the pulsing function in
your control system. The device generates its own test pulses on the safety
outputs. A downstream control system must tolerate these test pulses,
which may have a length of up to 1 ms.
The test pulses are also output when the safety outputs are switched off.
Depending on the inertia of the connected device (control system, relay,
etc.), this can lead to short switching processes.
The inputs on an evaluation unit connected must be positive-switching, as the
two outputs on the HS3A deliver a level of 24 V DC in the switched-on state.
All the electrical connections must either be isolated from the mains supply
by a safety transformer according IEC 61558-2-6 with limited output voltage
in the event of a fault, or by other equivalent isolation measures (PELV).
All electrical outputs must have an adequate protective circuit for inductive
loads. The outputs must be protected with a free-wheeling diode for this
purpose. RC interface suppression units must not be used.
Power devices which are a powerful source of interference must be installed
in a separate location away from the input and output circuits for signal
processing. The cable routing for safety circuits should be as far away as
possible from the cables of the power circuits.
In order to avoid EMC interference, the physical environmental and operating
conditions at the installation site of the device must comply with the require-
ments according to the standard EN 60204-1:2006, section 4.4.2 (EMC).
Please pay attention to any interference fields in case of devices such as
frequency converters or induction heating systems. Observe the EMC in-
structions in the manuals from the respective manufacturer.
Important!
If the device does not appear to function when operating voltage is applied
(e.g. green STATE LED does not flash), HS3A must be returned unopened to
the manufacturer.
