Reaching Contract Speed (System 12 SCR Drive)
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iControl DC
Reaching Contract Speed (System 12 SCR Drive)
For Quattro DC Drive Reaching Contract Speed see page 4-11.
Be sure to read this entire section before performing the following procedure. The car must be
on Test operation (iBox Test switch to ON) throughout the setup procedure. This prevents the
doors from operating during adjustment.
Final Adjustment Before Running at Contract Speed
The following adjustments must be made in preparation for contract speed operation.
1. Arrange the elevator for no load (empty car) conditions.
2. System 12 Drive only:
• Refer to page -D1 of the job prints under Output Ratings. On the Configuration > Drive
> General tab, set Rated armature voltage equal to the SCR drive maximum output
voltage (header rating).
•Set Rated armature current equal to the SCR drive maximum output current (per
Output Ratings on page -D1 of job prints).
3. Verify that the iBox Test switch is in the ON position.
4. Verify motor parameters against the motor name plate.
5. Verify that all drive and initial parameter settings have been programmed. (Refer to Sec-
tion 2 and specifically see “Verifying Initial Parameter Settings” on page 2-43). These
parameters are critical for smooth operation during normal runs.
Determine the Armature Voltage Limit (System 12 SCR Drive)
Armature voltage limit is a percentage of the SCR drive maximum output voltage rating. For
example, if the drive maximum output voltage rating is 300VDC and you wish to limit the volt-
age to 270VDC, set Armature voltage limit (Configuration > Drive > Safety tab) to 90% (270/
300 x 100 = 90%). Factors to consider include:
• If you have a geared installation, read the armature voltage rating from the hoist motor
nameplate and use this figure to calculate the Armature voltage limit setting.
• If you have a gearless installation, you may set the Armature voltage limit to be equal to
the hoist motor name plate voltage rating or up to 10% higher than name plate voltage (as
long as it does not exceed the maximum DC armature voltage rating of the SCR drive on
page -D1 of the job prints). Use this figure to calculate the Armature voltage limit setting.
• In any case, do not set Armature voltage limit any higher than 108% of the numerical value
of the 3-phase AC voltage existing on terminals X1, X2, X3 or Y1, Y2, Y3 on the contactors
at the bottom of the SCR drive. For example, if the 3-phase AC voltage was 270VAC, you
should not set Armature voltage limit any higher than 1.08 x 270 = 291.6VDC = 97%
(291.6/300 x 100 = 97%).
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