Blodgett MT2136 Series, Service And Repair Manual

Page: 63 / 94

MT2136
4-3
STANDARD CONTROLLER CONFIGURATION
BELT SPEED CALIBRATION - OPEN LOOP
NOTE: The following procedures must be perĆ
formed after dc voltage levels have been
set and are known to be accurate.
The cooking time digital display should be adĆ
justed when changing any of the system compoĆ
nents. Prior to adjusting the display, determine the
following two specifications:
1.
The number of pulses per spindle revoluĆ
tion generated by the Hall effect pickup.
Move the plastic endĆcaps on the pickup loĆ
cated on the DC motor. If the pickup is marked
with the number 2, it is a single pulse per revoĆ
lution pickup. If the pickup is marked with the
number 10 (Standard After 6Ć1Ć91) it is a five
pulse per revolution pickup. Replace the endĆ
caps.
2. The manufacturer and the voltage rating of
the DC drive motor.
This information is embossed on the nameĆ
plate located on the motor's case.
Once the above specifications have been deterĆ
mined, perform the following calibration proceĆ
dures.
1. Remove the screws securing the cooking time
display lens cover. Remove the lens cover. If a
5 pulse pickup is used, verify that the multiplier
potentiometer is set to the x10 position (refer
to FIGURE 4 for the potentiometer location).
Cooking Time
INCREASE DECREASE
X1
X10
Belt speed DIP switch located
behind cooking time digital display
Multiplier potentiometer located behind
cooking time digital display
For 5 pulse pickups set to x10
FIGURE 4
Set The Belt Speed DIP Switches.
Belt speed DIP switch settings are specified by the
following equations:
60Hz motors with a single pulse pickup use:
36 x Motor RPM x .275
60Hz motors with a five pulse pickup use:
36 x Motor RPM x .325
50Hz motors with a single pulse pickup
use:ą 36 x Motor RPM x .65
50Hz motors with a five pulse pickup use:
36 x Motor RPM x .325
NOTE: Refer to TABLE 3 to determine Motor RPM.
Bodine Motors RPM
130VDC (Standard after 9/15/90) 4.2
180VDC (50Hz Only) 4.2
TABLE 3
The DIP switch summed values should match the
value obtained in the previous equation. Move the
appropriate DIP switches to OFF.
EXAMPLE: For a switch value of 73 (from the motor
formula and TABLE 3), set switches 7, 4 and 1 to
OFF since the total of these switches is 73
(64+8+1=73).
8 7 6 5 4 3 2 1
Switch Setting For A Value Of 73
128 64 32 16 8 4 2 1
OFF
Rear Of
Switch Number
Switch Value
Control
FIGURE 5