C4 User Manual
Page 16 ©2021 Smartrise Engineering, Inc. All Rights Reserved October 25, 2021
2.1.9 Safety String Inputs 120 VAC
WARNING
ALL CONNECTIONS ON THIS TERMINAL BLOCK ARE HIGH VOLTAGE. DISCONNECT POWER TO
THE CONTROLLER BEFORE WIRING THESE TERMINALS.
This terminal block contains the connections for the controller safety string. Each input is
always monitored (including Construction Mode). The source and termination for all Machine
Room and Hoistway safeties are located on this terminal block.
All terminals have a corresponding LED list when active.
PIT Terminal – Termination for the Pit switch. The primary side of the switch is connected to
H120 and the secondary side is then wired back to the PIT terminal.
BUF Terminal – Termination for the Buffer switch. The primary side of the switch is connected
to H120 and the secondary side is then wired back to the BUF terminal.
TFL Terminal – Termination for the Top Final Limit switch. The primary side of the switch is
connected to H120 and the secondary side is then wired back to the TFL terminal.
BFL Terminal – Termination for the Bottom Final Limit switch. The primary side of the switch is
connected to H120 and the secondary side is then wired back to the BFL terminal.
H120 Terminal – Internal fused source for all hoistway safeties. This is used to power the PIT,
BUF, BFL, TFL and any other addition hoistway safety devices.
See the C4 controller sheet 02 Machine Room I/O wiring information.
SFM Terminal – Termination for all Machine Room safety devices that do not have a dedicated
input, for example, Run/Stop switch, roper gripper contacts and EBrake. All additional devices
are wired in series and terminated to the SFM.
SFH Terminal – Termination for all hoistway safety devices that do not have a dedicated input.
All additional devices are wired in series and terminated to the SFH.
See the C4 Controller sheet 02 Machine Room I/O for wiring information.
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