Delta EB3000 Series User Manual page 83

Chapter 4 WiringEB3000
4-9-4-5 STO Wiring Examples
Circuit with one operation contactor that complies with EN81-1 / EN81-20
The STO circuit can be installed in an elevator system that only uses one instead of two operation
contactors. In such a system, the following guidelines must be followed to comply with EN81-1 or
EN81-20.
 Circuits must be designed in order to deactivate input terminals STO1 and STO2 when the
safety circuit is OFF, and disable the drive output.
 The drive digital output (MO) must be set to 42 (STO Output Status). This signal must be
connected to the contactor monitoring circuit in the elevator controller in order to prevent the
motor from restarting when STO circuit or operation contactor malfunctions.
 All contactors and wirings chosen and installed must be conformed to EN81-1 or EN81-20.
 STO inputs (terminals STO1 and STO2) must be used to enable / disable the drive.
NOTE:
1. Once input terminal STO1 or STO2 is OFF, the drive output will immediately stop. In this case, use brake
immediately to prevent the elevator from moving.
2. Input terminals STO1 and STO2 must be ON before setting the Up/Down command. The elevator controller can give
the Up/Down command only when it receives the signal that the STO Output Status (MO=42) is OFF.
3. After the elevator stops, STO1 and STO2 should be OFF. The elevator controller must receive the signal that the
STO Output Status (MO=42) is ON, if not, STO circuit sticking may occur and the elevator cannot be started again.
4-30
Figure 4-27