I
Operating Instructions
Electronic Star Delta Timer
Type: 7PU60 20
Operating Voltage range :
Not Applicable for 7PU6020 3NW2
0.8 to 1.1 x Us
(Us = Rated Voltage)
Setting accuracy: ±25% in sector
scale
Recovery time: £ 150 ms
Repeat accuracy: ± 0.5%
Selection
The Siemens 7PU60 20 Timers
provide adjustable star time
i.e.[(2-20/6-60 sec)/(20-200 sec)]
and fixed Star to Delta transfer
time (i.e. 50 ms)
Timers type 7PU60 20–3N..are
provided with 2 time setting
ranges. Selection of range is done
with Selector Switch, Provided on
the front plate of timer. Timer type
7PU60 20–4N.. has one setting
range (Selector switch is not
functional)
AC Voltage
110V
220/240V
380/440V
220/400V
Technical Data
Rated insulation
Voltage
: 500V AC
Voltage Code
J2
N2
T2
W2
Installation
Type
Setting time range
7PU60-20-3N.. 2-20/6-60 secs.
(can be selected
with selector
switches)
7PU60 20-4N.. 20-200 secs
(Selector Switch is
not functional)
Snapped on standard DIN
mounting rail (35 mm) to EN50022
or
Fixed by two M 3.5 screws on a
plain surface. Plain washers and
Rated operating
Current : Ie AC 15 at 220V=3A
at 440V=1A
Ie DC 13 at 220V=0.1A
Can be mounted in any position.
Allowable conductor
Cross Section.
– Solid 2 x 2.5 mm2
– Stranded with end sleeves:
2 x 1.5 mm2
Terminal screws: M3.5
Tightining Torgue: 80 to 120 N–Cm
Terminal diagram:
See front plate of the timer
Functional diagram:
Ref. Fig: 2
2) ‘Y’ contact (17/18) closes
instantanously and remains
closed for set time ty which is
adjustable between 2-20/6-60/
20-200 sec.
3) ‘D’ contact (27/28) closes after
set time (ty) + dead time (td)
(i.e. Star to Delta transfer
time + 50 ms)
M3.5 Fixing screws (2X)
88
DIN Rail mounting feature
95
Operating temperature:
-25ºC to + 55ºC
For mounting dimension refer fig-1
1) Apply rated voltage to terminals
A1/A2
Setting time ranges
23.5
spring washers must be used.
112
15
Fig. - 1
2
Fig. - 2
Connection Diagram:
Control Circuit Wiring Diagram
Refer Fig – 3
1/N/PE ~ 50Hz Supply
S0 = Push Button OFF (1NC)
S1 = Push Button ON (1NO)
K1 = Line Contactor with 2NO
Auxiliary Contacts.
K2 = Star Contactor with 1NO + 1NC
Auxiliary Contacts.
K3 = Delta Contactor with 1 NC
Auxiliary Contacts.
K4 = Star Delta Timer with 1NO
instantaneous and 1NO delayed
Auxiliary Contacts.
F1 = Overload Relay.
F0 = Backup Fuse.
Main Circuit Wiring Diagram
Refer Fig – 4
3 ~ 50Hz V
K1
K2
K3
F1
F0
=
=
=
=
=
Standard Products Division
Control Systems & Products
Thane Belapur Road,
Thane - 400 601
Tel. : (022) 760 0001
Fax : (022) 760 0076
Siemens Ltd.
SGR-01-111-006
This replaces SGR-01-111-005
Line Contactor
Star Contactor
Delta Contactor
Overload Relay
Backup Fuse
Instruction No. 4I–0088–0115786 203
Product development is a continuous process. Consequently
the data indicated in this leaflet is subject to change without
prior notice. For latest issue contact our sales offices.