iCentral - Central Dispatcher
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iControl DC
Check for Shorts to Ground
Check for shorts to ground before powering up the system. Power must be OFF at the main
disconnect(s). A short to ground is defined as having a resistance of less than 20 ohms
between the #1 (Common) bus and the terminal being tested. If any shorts to ground are dis-
covered, they must be corrected before proceeding.
Be certain that power is OFF at the main disconnect(s) before proceeding.
1. Using a standard screwdriver, temporarily disengage all twist-socketed fuses by turning
them counterclockwise until they pop up.
2. Measure the resistance between the #2 (120VAC) bus terminals and the #1 bus.
3. If no shorts to ground are discovered, re-engage the fuses.
AC Voltage Verification and Wiring
The AC wiring instructions in this section describe connecting power wiring between the iCon-
trol elevator cabinets and the iCue cabinet. The majority of technical information is contained
in the MCE job prints package and referenced here as necessary. AC voltage verification and
wiring instructions include:
•Verifying main line power
• Wiring iCue
• Initial power up and test for bus voltage presence
All conductors entering or leaving the cabinet must be through conduit.
1. Consult the job prints. Verify that AC supply is as specified.
2. Refer to the Group Supervisor Field Wiring Print in the job prints and to the following
illustration. iCentral power is provided by the car controllers as shown in drawing -2.
The main AC power supply wiring size must be determined by the electrical contractor.
2a. Check the phase-offset of the individual car ST2-bus lines before connecting them
to the Group cabinet. Use a voltmeter set to AC volts to measure between adjacent
car 2-bus terminals in the Group cabinet. The meter must read less than 10VAC. If
the reading is higher, reverse the power leads going to the car T1 transformer at L1
and L2 and measure again.
All 2 bus power from cars to the iCue cabinet must be in phase. Connecting out-of-phase power
WILL cause damage.
2b. A separate conduit or trough must be provided for the System (group-to-car)
Ethernet network. Wiring details in the job prints must be followed exactly.
2c. If applicable, also wire according to the Group Interconnects to Individual Car
Cabinets print. Be sure to ground all cabinets according to instructions.
2d. Refer to the Group Supervisor Field Wiring Print for iCentral field wiring instruc-
tions.
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