Construction Mode
2-28 Manual # 42-02-7223
Basic Safety String and Associated Wiring
This section contains wiring instructions for basic safety string switches (in Construction Mode,
before the iLink cartop interconnect is installed). A safety string is essentially a number of nor-
mally-closed switches connected in series such that, should any one of the switches open, power
to the motor and brake will immediately drop to stop the car. The elevator must not be run until
the safety string is connected. Safety string wiring includes:
• Emergency Stop switch
• Hoistway safety switches
• Cartop safety CTS Relay temporary bypass (for Construction Mode use only)
The location and number of safety switches varies from job to job. MCE job prints indicate exact
job wiring as determined during the job survey. Please refer to “Safety String Bypass Jumper”
on page 6-3 for safety bypass related information.
Cartop Safety Switches
Depending upon the job, cartop safety switches may include:
• Safety Clamp Switch
•Emergency Exit Contact
•Emergency Stop Switch
•CTS Relay (iLink)
The wiring instructions for these switches are on the job prints.
1. Refer to the job prints.
2. Wire the cartop safety switches as shown.
The Cartop Safety Relay is located in the cartop interconnect box. If the box is not yet installed,
the relay must be temporarily bypassed to get the car operating in construction mode. For now,
using the switches and terminals available to you, wire as much of the string as you are able.
Hoistway Safety Switches
Depending upon the job, hoistway safety switches may include:
•Final Limit Switches
•Buffer Switches
•Pit Door Switch
•Pit Stop Switch
•Governor Switch
The wiring instructions for these switches are on the job prints.
1. Refer to the job prints.
2. Wire the hoistway safety string switches as shown.
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