Rockwell 70-602, Technical Manual

Page: 23 / 48

STEP 3 - Change the heater elements in the overload
block, Fig. 8, for the proper voltage/ampere rating
shown on the motor nameplate.
For every LVC motor starter, a heater coil chart is
located on the inside cover of the motor starter enclo-
sure. See Fig. 14.
Note from the motor nameplate, the full load current
for the new line voltage. Select the heater or heaters
one code number lower than specified in the table of
the heater coil chart which will give a maximum trip
r a t i n g o f a p p r o x i m a t e l y 1 1 5 % o f t h e m o t o r n a m e -
plate current.
S I N G L E P H A S E
For example, on three phase starters, assume it is nec-
essary to pick a heater for a motor with a nameplate
rating of 10.6 amperes.
Reference to the heater coal
chart in Fig. 14, shows that a 10.6 full load motor
ampere rating corresponds to a heater code number,
E-56. Thus, heater number E-55, should be specified
w h i c h w i l l g i v e a m a x i m u m t r i p r a t i n g o f a p p r o x i -
m a t e l y 1 . 1 5 x 1 0 . 6 = 1 2 . 2 a m p e r e s .
of
M o . C o d e
Mu. No.
T H R E E P H A S E
Fig 18 - Heater Elements for Non-Compensated Relays
1 7