Idiomas disponibles
Idiomas disponibles
Overload Relay
Instructions
WARNING:
HAZARDOUS VOLTAGE
CAN CAUSE ELECTRICAL SHOCK
AND BURNS.
DISCONNECT POWER BEFORE PROCEEDING
WITH ANY WORK ON THIS EQUIPMENT.
The 3UA7 overload relay consists of a basic unit fitted with supplementary
modules. The modular system permits the user to uprate the basic version or
to modify it, e.g. from a contactor-mounting to a single-mounting unit. The
modules are snapped onto the basic unit.
Ordering data (Fig. I):
➀ 3UA70 10-..
Single-mounting (1NC)
➁ 3UA70 11-..
Single mounting (1NO+1NC), test function,
trip indicator
➂ 3UA70 21-..
Contactor-mounting unit (1NO+1NC), test function,
trip indicator
➃ 3UA70 20-..
Contactor-mounting unit (1NC)
Modules (Fig. I):
➄ 3UA79 00-0A Single-mounting module
➅ 3UA79 00-0B Contactor-mounting module
➆ 3UA79 01-0A Functional module with 1 NO contact, test button,
trip indicator
➇ 3UA79 00-0C Cover (shock protection)
➈
Basic units
➉ 3UA79 01-1
Remote resetting
Installation
(dimensions in mm)
Dimension drawings
Mounting onto contactors:
Individual mounting:
Permissible installed positions:
Keep distance to earthed parts (≥ 6 mm).
Do not subject to sudden shocks or long-term vibrations.
With ambient temperatures above 25 °C, in-row mounting and simultaneous
loading of several relays: reduce the upper setting value I
or keep a centre-to-centre spacing of 5 mm between the units.
Modules
Modifying from contactor-mounting to single-mounting or vice
Fig. IVa:
versa.
Fig. IVb:
Extending the basic unit by functional modules.
Connection
Permissible cable cross-sections: Fig. Va
Equipment circuit diagram:
In the case of several single-phase loads, the three main circuits must be
connected in series.
Commissioning
Instructions:
Basic unit:
➀ Set setting lever to rated load current.
➁ Stop/reset button (red):
Press this button before putting relay into operation and after tripping.
Off function: During operation the NC contact can be opened manually
by pressing the stop/reset button. The relay itself remains ready for
operation.
➂ Device nameplate.
➃ Terminals for three motor leads.
➄ Terminals for NC contact.
2
Fig. IIa
Fig. IIb
Fig. III
by 0,5 % per °C
O
Fig. Vb
Fig. VI
Order No.: 3ZX1012-0UA70-1AA1
Functional module:
➅ Trip indicator: (I) relay ready for operation, (O) relay has operated.
➆ Test button: Tripping can be simulated by pressing the test button (NC
contact opens, NO contact closes). Subsequently , press again reset
button.
➇ Terminals for NO contact.
The
tripping characteristics
(
Fig. VII
for machines with type of protection E Ex e.
Technical data
Mounted on contactors 3TF20, 3TD20, 3TE20 and single mounting.
Rated insulation voltage
Rated operational current for single mounting
Rated operational current for contactor mounting
Permissible ambient air temperature
Degree of protection
Short-circuit protection
Auxiliary circuit
Rated operational currents
AC-15/U
V
24
60
e
AC-15/I
A
2
1.5
e
DC-13/U
V
24
60
e
DC-13/I
A
2
0.5
e
Rated insulation voltage
3UA7010
3UA7020
690 V
400 V
differing potential
Short-circuit protection:
NH, NEOZED or DIAZED fuses
Miniature circuit-breaker
Continuous thermal current I
th
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
Perm. current loading referred
temperature
to end-of-scale value
55 °C
60 °C
65 °C
70 °C
Calculation example:
Motor rated current: 10 A
Ambient temperature: 70 °C
Overload relay fitted: 8...12.5 A
1st Step: Determine the permissible current loading:
Max. current loading: 12.5 A x 0.82 = 10.25 A
Loading with motor rated current 10 A at 70 °C ambient temperature is
permissible.
2st Step: Calculate the setting current:
Motor rated current: 10 A
Setting current correction: 10 A x 1.1 = 11 A
You must set the overload relay to 11 A.
For further information and accessories, see Catalog.
3UA7
DIN VDE 0660, Part102, IEC 947-4
English
) conform to VDE 0165, VDE 0170/0171
690 V
up to 12 A
up to 10 A
-25 °C to +55 °C
IP 20 (IEC 529)
see nameplate
125
230
400
500
1.25
1.15
1.1
1
110
220
0.3
0.2
3UA7011
3UA7021
690 V
same potential
6 A gG, 10 A Dz fast
3 A (C-characteristic)
6 A
Setting current
correction
1
1
0.94
1.08
0.88
1.09
0.82
1.1
690
0.8
