Safety String Bypass Jumper - MCi iControl User Manual

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 to move the car so
that the safety string can once again be "made up." 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 completed. Once the safety string is com-
plete 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.
Danger
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 circuitry 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
Cartop exit input
Emergency Stop switch on car
Governor switch input
Hoistway safety string
Car safety string
Bypasses
Safety String Bypass Jumper
Does not bypass
Rope Gripper OK from Rope Gripper board
Unintended motion fault already tripped
Rope brake fault already tripped
Machine Room Emergency Stop switch
Any Safety Processor A or B fault
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