6-3
Safety String Bypass Jumper
iControl AC
6
Safety String Bypass Jumper
If any switch or relay in the safety string opens, the car immediately loses power and stops. In
some situations, you may need to temporarily bypass an open safety string. For example, if the
car has tripped a final limit, you will need to bypass the safety string and move the car up (or
down) the hoistway past the limit switch so that the safety string can again be made. Once the
safety string is complete again, you must immediately remove the bypass jumper.
The safety string bypass location for iControl is accessed through ports on the front cover of the
iBox. The ports are sized so that a jumper wire (16AWG minimum) with insulated clips on each
end can be used to short the SB and 3 terminals to bypass the safety string.
You are jumpering 110VDC. Place the jumper with caution, being certain that you are insu-
lated from the possibility of electrical shock.
The safety bypass is intelligent. The jumper will have no effect if it is put in place with the safety
string intact (other than to generate a time out after 15 minutes pass). The jumper will bypass
the string and allow the car to be moved only if it is placed after the safety string has opened. If
the jumper is in place when the string opens, you must remove the jumper, then
replace it before it will bypass the string.
The jumper is monitored by a timer. If the jumper is in place for longer than 15 minutes, the
timer will expire, drop the brake and motor contactors and generate a Safety Bypass Jumper
Time Out. To clear the fault and restart the car, you must remove the bypass jumper. If more
time is needed, re-install the jumper and the fifteen-minute timer will restart.
The table below specifies what is and is not bypassed by the jumper.
Table 6.1 Safety String Bypass Jumper
Bypasses Does not bypass
Cartop exit input Rope Gripper OK from Rope Gripper board
Emergency Stop switch on car Unintended motion fault already tripped
Governor switch input Rope brake fault already tripped
Hoistway safety string Machine Room Emergency Stop switch
Car safety string Any Safety Processor A or B fault
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