Reaching Contract Speed (System 12 SCR Drive)
42-02-7223 C1 4-9
4
iControl DC
Armature Voltage (System 12 SCR Drive)
While running the car, observe armature voltage by setting Virtual Oscilloscope Test point 1 to
Armature Voltage Synthetic Feedback.
The value show on the Virtual Oscilloscope Test point 1 and output to iBox test point STP1 is
scaled. A value of 8 volts is equal to the System 12 SCR Drive header voltage value shown on
page D1 of the job prints. To calculate the actual value of the reading on the Virtual Oscilloscope
Test point 1 and iBox test point STP1, use the formula: Header value I 8 x Test point 1 value, e.g.
if the header value is 240 volts, a reading of 6 volts on Test point 1 indicates an actual value of
180 volts (240 I 8 x 6 = 180).
As you approach contract speed, see that hoist motor armature voltage does not severely over-
shoot the desired value of the Armature voltage limit parameter (Configuration > Drive > Safety
tab). Any lighting of the Current Limit LED on the SCR drive at low speeds indicates current
limiting and may indicate voltage limiting if the Current Limit LED lights as you approach high
speeds. Also be sure armature voltage is reaching the desired value as you approach contract
speed. If it is too low (full load up/empty car down), the Field running voltage (Configuration >
Motor Field > Control tab) is too low.
Learning Terminal Slowdown Switches
Once the car is running at or near contract speed, you must learn the terminal slowdown
switches in order to safely run the car to the terminal landings (required before performing
drive fine tuning).
Please proceed to “Learning Normal and Emergency Terminal Limit Switches” on
page 4-12.)
Before learning the terminal switches, you can trip on terminal position and/or velocity faults when
the terminal switches (UNT1, DNT1, etc.) are activated. Avoid activating the terminal switches until
they have been learned.
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