EXCEL 50 INSTALLATION INSTRUCTIONS
19
EN1B-0101
Power Supply
The Excel 50 Controller is powered by an external trans-
former.
Transformer requirements for one Excel 50 Controller:
Voltage
24 Vac
±
20%
Current
3 A, if fully equipped (6 DO's x 0.4 A)
2 A, if current of DO's does not exceed 1.8 A
Power
72 VA, if fully equipped
The transformer, already installed in the cabinet, can be used
to supply several controllers, communication devices or peri-
pherals like actuators, etc. if the transformer provides
sufficient power.
Fig. 33. Transformer example.
CRT-Series
Table 12. Number of controllers connected to one
transformer.
Transformer
Controller Excel 50
CRT 2
1 (1.8A max.)
CRT 6
2
CRT 12
4
Use quick-acting backup fuse 10 A (or automatic H16 or L16)
to protect transformer primary side. On the primary side of
the CRT 2, there is a fusible output of type M 0.315 A (T)
250 V for the purpose of fine fusing.
Table 13. Overview of CRT Series AC/DC current.
Transformer
max. AC current
max. DC current
CRT 2
2 A
0.5 A =
500 mA
CRT 6
6 A
1.3 A = 1300 mA
CRT 12
12 A
2.5 A = 2500 mA
Fig. 34. AC/DC current graphs.
1450 Series
All transformers of the 1450 series are designed for 50/60 Hz
AC and have insulated accessory outputs. The transformers
include built-in fuses, line transient/surge protection and AC
convenience outlets and meet NEC class 2 requirements.
Table 14. 1450 Series transformers.
Part #
1450 7287
Primary Side
Secondary Side
-001
120 Vac
24 Vac, 50 VA
-002
120 Vac
2 x 24 Vac, 40 VA and
100 VA from separate
transformer
-003
120 Vac
24 Vac, 100 VA and
24 Vdc 600 mA
-004
240/220 Vac
24 Vac, 50 VA
-005
240/220 Vac
2 x 24 Vac, 40 VA and
100 VA from separate
transformer
-006
240/220 Vac
24 Vac, 100 VA and
24 Vdc 600 mA
Standard Transformers
Standard commercially available transformers must fulfill the
following specifications:
Table 15. Requirements for Standard Transformers.
Output voltage
Impedance
AC current
24.5 Vac to 25.5 Vac
≤
1.15 ohms
max. 2 A
24.5 Vac to 25.5 Vac
≤
0.40 ohms
max. 6 A
24.5 Vac to 25.5 Vac
≤
0.17 ohms
max. 12 A
