7–29
T-372
is automatically terminated and the valves return to normal machinery control. To operate the override:
1. Press the CODE SELECT key.
2. Use the Arrow keys until Cd41 is displayed in the left window. The right window will display a controller
communications code.
3. Press the ENTER key. The left display will show a test name alternating with the test setting or time remaining.
4. Use the Arrow keys to scroll to the desired test, and then press the ENTER key. “SELCt” will appear in the
left display.
5. Use the Arrow keys to scroll to the desired setting, and then press the ENTER key. Selections available for
each of the tests are provided in
.
6. If the timer is not operating, follow the above procedure to display the timer. Use an Arrow key to scroll to the
desired time interval and press the ENTER key to start the timer.
7. The above described sequence may be repeated during the timer cycle to change to another override.
7.26 Autotransformer
If the unit does not start, check the following:
1. Verify the 460 VAC (yellow) power cable is plugged into the receptacle (see
) and locked in place.
2. Verify that circuit breakers CB-1 and CB-2 are in the “ON” position. If the circuit breakers do not hold in,
check voltage supply.
3. Using a voltmeter, and with the primary supply circuit ON, check the primary (input) voltage (460 VAC). Next,
check the secondary (output) voltage (230 VAC). The transformer is defective if output voltage is not available.
Figure 7.20 Autotransformer
1) Circuit Breaker (CB-2) 230-Volt
2) Dual Voltage Autotransformer
3) 460 VAC Power Receptacle
- - - - -
Table 7–1 Valve Override Control Displays for Cd41 “SELCt”
Controller Communication Codes (Right Display)
Setting Codes (Right Display)
tIM
(Override Timer)
0 00
(0 minutes/0 Seconds)
In 30 second increments to
5 00
(5 minutes/ 0 seconds)
PCnt
(% Setting - DUV Capacity Modulation)
AUtO
(Normal Machinery Control),
0, 3, 6, 10, 25, 50, 100
EEV
(% Setting - Electronic Expansion Valve)
AUtO
(Normal Machinery Control)
CLOSE
(Closed)
0, 3, 6, 10, 25, 50, 100
CAP
(Capacity Mode)
AUtO
(Normal Control)
Std; UnLd (
Economizer = Closed
)
ECOn
(Economizer = Open)
1
3
2
