Operating Instructions
Euchner Control Box ECB-...
10
(Translation of the original operating instructions) 2533580-02-03/20
6. Function
Important!
The system can fulfill its safety function only if the users always carry their CKS keys with them when
accessing the machine. When leaving the machine, they must ensure that there are no other persons
in the machine. Only persons who have been instructed about using the ECB device safely may access
the machine. The organization operating the machine must ensure that these guidelines are met.
6.1. Operation as an electronic lockout bar
(version ECB-A-2K-A2-160398)
The device closes the floating, safe relay contacts 13 / 14 and 23 / 24 if the taught-in CKS keys are inserted into both
CKS key adapters.
As soon as the CKS key is in the CKS key adapter, the LED on the CKS key adapter illuminates and data transmission to the
CES evaluation unit begins. The read code is compared with the taught-in code in the CES evaluation unit.
When using the system, ensure that the respective CKS key is inserted into the associated CKS key adapter. If the CKS keys
are inserted interchanged, safety contacts 13 / 14 and 23 / 24 do not switch through. CKS keys come in different colors
to permit a visual allocation. The two safety contacts 13 / 14 and 23 / 24 are closed only when both CKS keys have been
correctly inserted into the CKS key adapters of the same color (red or black).
When the CKS key is removed from the CKS key adapter, the white LED goes out, safety contacts 13 / 14 and 23 / 24
are opened and the installation is switched off. The installation is prevented from restarting when the CKS key is removed.
Pulsed signals from a safe control system can be connected to safety contacts 13 / 14 and 23 / 24 of the ECB-A2 device.
The pulses are looped through if the relay contacts are closed. The pulsed signals can then be read back and evaluated by
the control system to detect any short circuit immediately.
6.2. Operation as an electronic lockout bar in combination with guard locking
(version ECB-A-2K-A1-160397)
In addition to the lockout bar function described above, this device features the option of controlling the guard locking of a
safety switch CTP-LBI-AP. In this combination, guard locking fulfills only the requirements for process protection.
The task of the ECB-A1 is to ensure that guard locking can be released only if the following conditions are met simultaneously:
Ì
A PLC signal is present at input IMP.
Ì
At least one of the two CKS keys has been removed from the CKS key adapter.
As long as the operator carries the CKS key with him, there is no hazard for the operator due to unexpected machine start-
up or being locked into the machine unintentionally.
Guard locking of safety switch CTP-LBI-AP cannot be activated or moved to locked position as long as at least one of the
CKS keys is removed. Safety outputs FO1A and FO1B of safety switch CTP-LBI-AP are switched off as long as guard locking
is released.
When the operator leaves the hazardous area and inserts the CKS key into the CKS key adapter (both keys are inserted again),
guard locking is activated immediately if the door is closed. Safety switch CTP-LBI-AP is moved to locked position even if
voltage is present at control input IMP. Safety contacts 13 / 14 and 23 / 24 are closed, and the installation can be started.
Safety switch CTP-LBI-AP additionally features a bistable guard locking function. It ensures that the guard locking remains
in its most recent position in case of a power failure. Either “locked” or “released”.
When the operating voltage (24 V at U
B
) is applied again after a voltage failure, the door locked by safety switch CTP-LBI-AP
will be released only if the following conditions are met:
Ì
A PLC signal is present at input IMP.
Ì
At least one of the two CKS keys has been removed from the CKS key adapter.
These measures prevent persons from being unintentionally locked into the hazardous area, and the installation cannot be
started.
