Nakanishi E2280 Operation Manual page 36

③ Safety Relay Signal
CAUTION
If the Emergency Stop Function is not installed, the Emergency Stop Signal (EMG - IN) will not function.
If enabling the Emergency Stop Function, it is necessary to set parameter
Selection of Emergency Stop Function " section.)
Pin No. 3 -1 1, 4 -1 2
・ The Safety Relay will be ON or OFF depending on the state of the " Emergency Stop (Pin No. 1 : EMG -
INA - Pin No. 9 : EMG - INB) ".
・ When there is continuity between Pin No. 3 (SAFE - 1A) and Pin No. 11 (SAFE - 1B) or between Pin No.
4 (SAFE - 2A) and Pin No. 12 (SAFE - 2B) the motor is off. If there is no continuity between these pairs of
pins then the system is operating normally.
・ If the Emergency Stop Signal is ' OFF (Open) ' the Safety Relay will be ' OFF (Open) ' and the motor power
will be interrupted and the motor will stop.
・ If the (NO) Normally Open contacts of the Safety Relay are welded together by an over load or short circuit
the (NC) Normally Closed contacts separation are maintained with more than 0.5mm spacing by the relay's
recoil mechanism.
・The voltage / current specifications of Pin No. 3 - 11 and Pin No. 4 - 12.
Applied Voltage (V) ≦ DC+30V
Working Current (Ip) ≦ 2A
Refer to Fig. 32 below for connections.
* Safety Relay
If an N - O contact becomes welded, all N - C contacts will maintain a minimum distance of 0.5 mm when
the coil is not energized.
N - O contacts (Normally - opened contacts) : Contacts of U - Uʼ, V - Vʼ, W - Wʼ.
N - C contacts (Normally - closed contacts) : Contacts of (SAFE - 1A) - (SAFE - 1B), (SAFE - 2A) - (SAFE -
2B)
* Machine Safety Circuit is possible when using the Safety Relay Contacts Output
・ When an Emergency Stop Signal input that is coupled to a door open switch of an Industrial Machine, the
Safety Relay will energize and open the Motor Power Line circuit.
・ Contact outputs ((SAFE - 1A) - (SAFE - 1B), (SAFE - 2A) - (SAFE - 2B)) of the N - C contacts can be
used for detecting the opening of the Motor Power Line. If N - O contacts become welded, contact outputs
will maintain an OFF (Open) condition, by Forced Guide Mechanism. Therefore, Safety Relay can be used
as an open signal of a movable guard or operator door with a locking (switch) mechanism for Industrial
Machinery.
The side of CONTROLLER
Motor output part
Safety Relay
U' V' W'
Contact
U V W
Motor output line
Fig. 32
(Refer to P108 " 18 - 4 ⑪
3 (SAFE-1A)
11 (SAFE-1B)
4 (SAFE-2A)
12 (SAFE-2B)
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