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FORM 1A: GENERATOR-ARC CIRCUIT DATA
Remarks
Theatre Date . .
City Revised
State
Theatre Circuit
Chief Projectionist
1. MOTOR-GENERATOR SETS
Make & Model
Number of sets
Serial Nos
If more than one set, how many are used for each arc at one time?
If more than one set, how many arcs supplied by each set?
If two or more sets are used to supply same arc at same time, how interconnected?
4. FIELD RHEOSTATS
Make & model
Number of rheostats per generator .
Capacity, amperes
Resistance range
Number of settings
Normal setting
Where located
Remarks
Remarks
5. A.C. POWER CONTROL
2. MOTORS
H.P
Volts
Cycles
Phase
Speed
If separate from generators, make, model, and serial Nos
Main switch: Type
Where located
Fuses: Type
Rating
Where located
Circuit breakers: Type . .
Rating
Where located
Control cabinet & starter:
Control box
Starter
Relay switch
Remarks
Remarks
6. BALLAST RESISTANCES
Make & model •.
Number of resistances
Where more than one is used as a unit, number per circuit, specifications, and how connected
3. GENERATORS
Full output voltage
Output voltage used
Capacity, kilowatts
Speed Resistance of one unit
Number & type of brushes Ballast voltage-drop .
Capacity, amperes . . ,
Remarks
If separate from motors, make, model and serial Nos
8. TRANSMISSION LINE
Length of "run"
How many power wires from generator
room to booth
B & S gauge of wire
Type of cable
Line resistance per circuit
Line voltage-drop per circuit
Main switch: Type
Where located
Fuses: Type
Rating
Where located
Circuit breakers : Type
Rating
Where located
Remarks
9. METERS
Line (A.C.) voltmeters:
Make & model
Number of voltmeicrs . . .
Capacity, volts
Normal reading
How connected
Where located
Generator or arc voltmeters :
Make & model .
Number of voltmeters . . .
Capacity, volts
Normal reading
How connected
Where located
Ammeters :
Make & model
Number of amme'ers . . . .
Capacity, amps
Normal reading
How connected
Where located
Remarks
10. EMERGENCY EQUIPMENT
Remarks
7. ARC POWER
Arc voltage (drop)
Arc resistance
Arc current
the sum from the voltage at the generator
Formula: ea = E — [eb + ex] METHOD 3. Rule: To find the arc-drop multiply the current in amperes by the resistance of the arc in ohms.
Formula: Ra is the ohmic resistance of the arc: ea -■= IRa To determine the ohmic resistance of the arc:
METHOD 1. (The line voltage-drop needed with this method will be considered under Section 8.)
Rule: To find the arc resistance add the ballast-drop to the line-drop. Subtract the sum from the generator voltage. Divide the difference by the current in amperes.
E — [eb + ej
Formula: Rn
I
METHOD 2. Rule: To find the arc resistance divide the arc-drop in volts by the current in amperes.
ea
Formula: Ra = —
I
To determine the current at the arc: this value is the same as the current anywhere in the arc circuit. Practically every installation is equipped with one or more
20
INTERNATIONAL PROJECTIONIST • April 1947