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Commissioning
1. Open the door by unlocking the
locks
2. Before switching ON, re-check
external connections.
3. Set Overload relay to 0.58 times the
rated motor current.
4. Set the dial of the Timer to an
approx. value of starting time of
Motor (preferably more than 6 secs)
A. Star-delta Timer setting
1. First Start the motor by pressing
Green push button, marked "I"
2. Measure time taken for it to reach
nearly rated speed or steady state
current (indicated when motor hum
reaches a steady pitch)
3. Stop the Motor, set Timer to this
measured value, by rotating the
Timer dial.
Figure 2: Timer Adjustment
Table 1: Technical Details
Motor Current
Motor Rating
at 415V, 3ph,
50Hz
Line
current
current
kW
HP
I
(A)
L
100
75
131
125
90
156
150
110
189
180
132
227
* For Type-2 co-ordination chart, refer latest Price list of " LV switchgear - Motor control products"
2
B. Relay Settings
1. For Closer protection set the
Overload Relay to the phase current
as measured by an ammeter.
2. In absence of Ammeter, use
procedure as given below:
a) Start the motor and let it run
for half an hour. Then gradually
reduce relay setting till it trips.
Set Relay at a slightly higher
value of this setting.
b) Allow reset time of approx. 4
min. Press the blue knob on the
relay completely to reset the
relay.
c) Re-start motor after some
time. If the relay does not trip,
consider it to be properly set. If it
trips follow step b with setting at
little higher value and recheck.
d) Overload relay characteristics
given below can be used to
Dial
Figure 3: Relay setting Adjustment
"Type
Contactor
(ASD)"
Phase
MLFB
Delta/Main
I
(A)
3TF
ph
75.6
3TE05 94-2AR0
3TF49
90
3TE05 95-2AR0
3TF50
109
3TE05 96-2AR0
3TF50
132
3TE05 97-2AR0
3TF51
Caution:
1. Switch OFF the Starter, and
2. Under No Circumstances should
3. If the Relay trip even when set
4. Refer Table 1 for the Motor current
Figure 4: Maximum permissible angle from
vertical plane
Contactor
Birelay
(Inbuilt)
Star
Relay
3TF
Type
Range
3TF47
70-95A
3UA5800-8YZ1
3TF47
70-95A
3UA5830-5B
3TF50
95-120A
3UA5830-5D
3TF50
115-180A
3UA6230-5B
estimate the average tripping
time at different multiples of set
current.
disconnect the main supply by
switching OFF the main switch
before doing any maintenance.
the Relay be set higher than phase
current i.e.. 0.58 times the rated
current on the motor nameplate.
at the rated Motor current, the
suitability of the starter or relay for
the particular application should be
checked with the nearest Siemens
office.
corresponding to the Motor rating.
Recommended Cu
Recommend-
Cable with lugs in
ed Max.
sq. mm
Back-up HRC
Fuse rating
Incoming Outgoing
SIEMENS
make type
From
3NA
Supply
160
50
160
70
200
95
250
120
To Motor
25
35
35
50
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