ES0755 rev A 1/11
7
NOTE:
Wide voltage fluctuations are common in many industrial areas;
you need to know the minimum and maximum voltage which will be
supplied to the machine while it is in operation. U.S. National Elec
-
trical Code specifies that machines should operate with a variation
of +5% to -5% around an average supply voltage. If problems with
the line voltage occur, or low line voltage is suspected, an external
transformer may be required. If you suspect voltage problems, the
voltage should be checked every hour or two during a typical day to
make sure that it does not fluctuate more than +5% or -5% from an
average.
CAUTION! Make sure that the main breaker is set to OFF and the power is off at your supply panel BEFORE you
change the transformer connections. Make sure that all three black wires are moved to the correct terminal block
and that they are tight.
3
. Check the connections on the transformer at the bottom-right corner of the rear cabinet. The three
black wires labeled
74, 75,
and
76
must be moved to the terminal block triple which corresponds
to the average voltage measured in
step 2
above. There are four positions for the input power.
The labels showing the input voltage range for each terminal position are as shown in the follow-
ing illustrations.
High Volt
Low Volt
74 75 76
74 75 76
HIGH VOLT
488-458V
457-429V
428-403V
402-377V
376-354V
LOW VOLT
----------------
260-244V
243-227V
226-211V
210-195V
4.
Transformer T5 supplies 24VAC used to power the main contactor. There are two versions of this
transformer for use on 240 and 400V machines (32-0964B and 32-0965B, respectively).The 240V
transformer has two input connectors located about two inches from the transformer, which allow
it to be connected to either 240V or 200V. Users that have 220V-240V RMS input power should
use the connector labeled 240V, while users with 190-220V input power should used the connec-
tor labeled 200V. Users with the External High Voltage Option should use the 240V connector if
they have 420V-510V 60Hz power or the 200V connector if they have 50Hz power. Failure to use
the correct input connector will result in either overheating of the main contactor or failure to reli-
ably engage the main contactor.
The 480V transformer has three input connectors, labeled 360V, 400V and 480V. Users with 340-
380V 50Hz power should use the 360V connector while users with 380-440V 50Hz power should
use the 400V connector. The 480V connector is not currently used.
5
. Set the main switch to ON (rotate the shaft that engages the handle on the panel door clock
-
wise until it snaps into the ON position). Check for evidence of problems, such as the smell of
overheating components or smoke. If such problems are indicated, set the main switch to OFF
immediately and call the factory before proceeding
