Siemens 3UA66 Instructions Manual page 2

Overload Relay with Transformer
Instructions
WARNING:
HAZARDOUS VOLTAGE
CAN CAUSE ELECTRICAL SHOCK
AND BURNS.
DISCONNECT POWER BEFORE PROCEEDING
WITH ANY WORK ON THIS EQUIPMENT.
Installation
Dimension drawings (dimensions in mm):
Permissible installed positions:
Do not subject to sudden shocks or long-term vibrations.
Snap-on mounting on a standard EN 50 023 rail (75 mm) , or bolting on a
plane surface by four bolts to be secured by washers and spring washers.
Connection
Permissible cable cross-sections for phase conductors:I
... 200 A
Mounting on a) 3TB54, 3TF54/55
contactors b) 3TB56, 3TF56
2
Round con- mm ref. a) 35 to185
ductor with (...170 A)
cable lug ref. b) 35 to 240
2
Flat bar mm 20 x 3
Terminal M8
screws
Tightening Nm 10 to 14
.
torque lb in 89 to 124
Permissible cable cross-sections for phase conductors:
Solid
Finely stranded with end sleeve
AWG conductors
Tightening torque
For position of connection terminals:
Connection of the main conductors:
Equipment circuit diagram:
In the case of several single-phase loads, the three main circuits must be
connected in series.
Commissioning
Instructions:
¿ Set the scale to the rated current of load.
À Reset button (blue)
Push this button before commissioning and after tripping to make relay
ready for operation. In the as-delivered condition, the auxiliary contact
is set to H = Manual resetting. To change from H = Manual to A = Auto-
matic, press and turn the button counter-clockwise from H to A.
Á Test button (red)
When this button is actuated, the NC contact opens and the NO contact
closes.
In the „Manual" position, the relay is reset when the blue button is
pressed.
In the „Automatic" position, the relay is reset automatically when the
red button is released.
 TRIPPED indication (green)
In the H setting, a green pin protrudes from the front plate to indicate
the TRIPPED condition. In the A setting, this condition is not indicated.
Separate installation of the relay, see Catalog.
Tripping characteristics:
The characteristics conform to VDE 0165, VDE 0170/0171 for machines with
type of protection E Ex e. Tripping times are shown for a three-phase load
from the cold state (ambient temperature +20 °C).
2
Fig. I
Fig. II
3UA66 3UA68
... 400 A ... 500 A
3TB56 3TB58
3TF56/57 3TF68
50 to 240 2 x 70 to
2 x 240
2 x 30 x 5
M10
14 to 24
124 to 210
2
mm 2 x (0.5 to 1); 2 x (1 to 2,5)
2
mm 2 x (0.5 to 1); 2 x (0.75 to 2,5)
2 x 18 to 12
Ncm 0.8 to 1.4
.
lb in 7 to 12
Fig. III
Fig. IV
Fig. V
Fig. VI
Fig. VIII
Order No.: 3ZX1012-0UA66-1AA1
In the case of hot relays, preloaded with 1 x I
by approx. 25 %.
I Current setting
E
t Tripping time in seconds (+ 20 %)
A
¿ Setting range
À Type designation/Order No.
Á PTB (Federal testing Laboratories) Test Report No.
Technical data
Permissible ambient air temperature
Degree of protection
Main circuit
Rated insulation voltage
Rated operational current
Short-circuit protection
Table Fig. VIII
¿ Setting range (A = Ampere; u = minimum, o = maximum setting range)
... 630 A À Max. response current of the line-side circuit-breakers
Á Commissioning:
Set scale so that the ratio corresponds to the rated load current.
Example: Rated load current
2 x 95 to
Max. setting
2 x 240
Ratio
Auxiliary circuit
2 x 40 x 5
Rated insulation voltage:
400 V,
differing potential
45277.1
Rated operational currents:
AC-15/U V
e
AC-15/I A
e
DC-13/U V
e
DC-13/I A
e
Short-circuit protection:
NH, NEOZED or DIAZED fuses
Miniature circuit-breaker
Continuous thermal current I
Operating conditions at ambient temperatures > 55 °C
At ambient temperatures > 55 °C, you must
1. Reduce the current loading for the overload relay
2. Upwardly correct the setting current to prevent tripping at motor rated
current.
Correction factors:
Ambient
temperature
55 °C
60 °C
65 °C
70 °C
Example: Motor rated current: 100 A
Ambient temperature: 70 °C
Overload relay fitted: 80 to 125 A
1st Step: Determine the permissible current loading:
Max. current loading: 125 A x 0.82 = 102.5 A
Loading with motor rated current 100 A at 70 °C ambient temperature is
permissible.
2nd Step: Calculate the setting current:
Motor rated current: 100 A
Setting current correction: 100 A x 1.1 = 110 A
You must set the overload relay to 110 A.
For further information and accessories, see Catalog.
3UA66, 3UA68
DIN VDE 0660, IEC 60947
, the tripping times decrease
E
(u = minimum setting, o = maximum setting)
-25 °C to +55 °C
IP 00 (IEC 60529)
1000 V
3UA66 80 to 400 A
3UA68 320 to 630 A
see nameplate
= 188 A
= 250 A
= 188:250 = 0.75
690 V,
same potential
45277.2
24 60 125 230
2 1.5 1.25 1.15
24 60 110 220
2 0.5 0.3 0.2
th
Perm. current loading referred
to end-of-scale value
1
0.94
0.88
0.82
English
400 500 690
1.1 1 0.8
6 A gG or 10 A, fast
3 A (C-characteristic)
6A
Setting current
correction
1
1.08
1.09
1.1