CAUTION:

After adjusting slowdown pots, no other pots on the DAR board should be adjusted or be tampered with at this point.

C. 7Pc Board Preliminar Adjustments

The 7PC board is part of the Magnetek drive located in the back of the controller. The cover of the DC drive must be removed to get to the 7PC board. On the 7PC turn the following pots as indicated:

1. INT GAIN(73RH):

Adjust to 65 percent clockwise. This pot should be in the low range, dip switch 1SS(2)should be in the closed position.

2. PROP GAIN(74RH):

Adjust to 45 percent clockwise. This pot should be in the low range, dip switch 1SS(1)should be in the closed position.

3. TACH/VARM (79RH):

Adjust to 100 percent clockwise.

4. TACH RATE(76RH):

Adjust to 50 percent clockwise.

5. IR DROOP (77RH):

Adjust to 50 percent clockwise.

CAUTION:

no other pots on the Magnetek DC drive should be adjusted or be tampered with at this point.

V. INSPECTION MODE ADJUSTMENT PROCEDURE

A. Tach Voltage Verification

1.Set voltmeter on DC voltage and place the positive lead on T+U and the negative lead on T-U terminals.5pc board 1TB1 and 1TB2.
2. Turn the tach shaft in the direction it will rotate if the car is moving up. The UT (PMI 1-9) input should turn on and the voltage on the meter should be negative.
3. Turn the tach shaft in the direction it will rotate if the car is moving Down. The DT (PMI 1-10) input should turn on and the voltage on the meter should be positive.

B. Preliminary Tach Calibration

The inititial tach scaling is adjusted by choosing a combination of series connected resistors (1R to 4R) on the (5PC-1)board.
1. Disconnect tach leads from 1TB(1) and 1TB(2) terminals.
2. Calculate the required resistance (R) as follows:
Sheave Diameter /Tach wheel Diameter *Motor RPM =R(kilo-ohms)
If tach is direct drive the Tach to sheave Ratio would be 1 to 1.
4. Select the resistor series combination on the 5PC-1 board that is the closest to but not larger than Cal(R-35),Kilo-ohms.
By connecting jumpers to the appropriate tabs to bypass the resistors not needed. Note that all resistance values are in units of kilo-ohms.
5. Measure the resistance between 1TB91) and 1TB(2) terminals and adjust the TACH CAL (75RH) pot to obtain the calculate ohmic value of R. Reconnect the tach leads.
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