Standard Transformers; Screw Terminal Block Installation - Honeywell Excel 50 Installation Instructions Manual

EXCEL 50 INSTALLATION INSTRUCTIONS

Standard Transformers

Standard commercially available transformers must fulfill the
following specifications:
Table 15. Requirements for standard transformers
output voltage
24.5 Vac to 25.5 Vac
24.5 Vac to 25.5 Vac
24.5 Vac to 25.5 Vac

Screw Terminal Block Installation

1. Make sure that the power supply of the cabinet is
disconnected.
2. Make sure that the power supply of the cabinet is
disconnected and that the application module is plugged
in the housing.
3. Choose the min. cross sectional areas for all cables to
and from sensors, actuators, valves, relays, etc. you
want to connect to the Excel 50 Controller from Table 4.
4. Connect sensors, transducers, etc. to the analog input
terminals.
Fig. 33. Connecting a cable to a screw terminal
IMPORTANT
When installing a separate external transformer, do
not connect the cabinet ground to the controller
system ground.
5. If the distance between the controller and an actuator or
sensor with 24 Vac supply is greater than 550 ft
(170 m):
a) Choose a transformer from the transformers listed in
section "
Power Supply".
b) Connect the chosen transformer directly to the
actuator or sensor.
6. Connect sensors, transducers, etc. to the digital input
terminals.
7. Connect valves, actuators, relays, etc. to the analog
output terminals.
EN1B-0101GE51 R1105D
impedance AC current
≤ 1.15 Ω
max. 2 A
≤ 0.40 Ω max. 6 A
≤ 0.17 Ω
max. 12 A
8. Connect relays, actuators etc. to the digital output
terminals.
9. Select one of the transformers of the CRT series or
1450 series (Table 13 or Table 14) or use a com-
mercially available standard transformer fulfilling the
requirements in Table 15.
10. Make sure that the application module is attached to the
controller housing.
WARNING
High Voltage
Risk of death or electrical shock.
— Do not connect line power supply directly to the
terminals.
— Insulate devices with 120 Vac / 230 Vac by a
transformer.
IMPORTANT
The transformer feeding the Excel 50 Controller must
be in the same cabinet. For the selection of the trans-
former the max. DC current must be considered if
field devices with DC load are used.
The secondary side of the transformer must not be
connected to earth ground.
11. Connect the 24 Vac (-) on the secondary side of the
transformer to terminal 1 on Screw Terminal block A.
12. Connect the 24 Vac on the secondary side of the
transformer to terminal 2 on Screw Terminal block A.
Fig. 34. Connecting the power supply
IMPORTANT
If there already are additional transformers, for
example supplying actuators or active sensors:
— Connect the 24 Vac (-) (secondary side) of the
transformers together.
13. Attach the terminal blocks to the housing as shown in
Fig. 35.
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