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.
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
estimate the average tripping
time at different multiples of set
current.
Caution:
1. Switch OFF the Starter, and
disconnect the main supply by
switching OFF the main switch
before doing any maintenance.
2. Under No Circumstances should
the Relay be set higher than phase
current i.e.. 0.58 times the rated
current on the motor nameplate.
3. If the Relay trip even when set
at the rated Motor current, the
suitability of the starter or relay for
the particular application should be
checked with the nearest Siemens
office.
4. Refer Table 1 for the Motor current
corresponding to the Motor rating.
Figure 2: Timer Adjustment
Figure 3: Relay setting Adjustment
Figure 4: Maximum permissible angle from
vertical plane
Table 1: Technical Details
Motor Rating
at 415V, 3ph,
50Hz
Motor Current
"Type
(ASD)"
Contactor
Contactor
Birelay
(Inbuilt)
Recommend-
ed Max.
Back-up HRC
Fuse rating
SIEMENS
make type
3NA
Recommended Cu
Cable with lugs in
sq. mm
Line
current
Phase
current
MLFB
Delta/Main
Star
Incoming Outgoing
HP
kW
I
L
(A)
I
ph
(A)
3TF
3TF
Relay
Range
Type
From
Supply
To Motor
100
75
131
75.6
3TE05 94-2AR0
3TF49
3TF47
70-95A
3UA5800-8YZ1
160
50
25
125
90
156
90
3TE05 95-2AR0
3TF50
3TF47
70-95A
3UA5830-5B
160
70
35
150
110
189
109
3TE05 96-2AR0
3TF50
3TF50
95-120A
3UA5830-5D
200
95
35
180
132
227
132
3TE05 97-2AR0
3TF51
3TF50
115-180A
3UA6230-5B
250
120
50
* For Type-2 co-ordination chart, refer latest Price list of " LV switchgear - Motor control products"
2
Dial
