Cable Lengths And Cross Sectional Areas; Analog Inputs; Technical Description; Technical Specification - Honeywell Excel 50 Installation Instructions Manual

EXCEL 50 INSTALLATION INSTRUCTIONS

Cable Lengths and Cross Sectional Areas

Table 4. Signal types and cross-sectional areas
type of signal
≤ 300 ft
(100 m)
≤ 16 AWG
Power supply
(24 Vac)
(≥ 1.5 mm
Low-current
signals*
*E.g. for 0...10 V sensors, totalizers, digital inputs, 0...10 V
signals for actuators.
IMPORTANT
The max. length of a signal cable with 24 Vac supply
is 550 ft (170 m). The max. length of a two-wire,
0...10 Vdc signal cable is 1,300 ft (400 m). The
secondary side of the transformer must not be
connected to earth ground.
PRIMARY
VOLTAGE
2
24 Vac
1
TRANSFORMER
Fig. 19. Cabling of actuator with 24 Vac supply and max.
550 ft (170 m)
If the distance between the controller and actuator or sensor
with 24 Vac supply is greater than 550 ft (170 m), a separate
external transformer for the actuator or sensor is necessary.
PRIMARY
VOLTAGE
2
230 Vac
24 Vac
120 Vac
1
TRANSFORMER
Fig. 20. Cabling of actuator with 24 Vac supply from
external transformer and max. 1,300 ft (400 m)
IMPORTANT
We recommend installing a fuse on the secondary
side of the transformer in order to protect the devices
against miswiring.
EN1B-0101GE51 R1105D
cross-sectional area
≤ 550 ft ≤ 1,300 ft
(170 m) (400 m)
≤ 14 AWG
2 2
) (≥ 2.5 mm )
2
≤ 20 AWG (≥ 0.5 mm
)
24 V
Y
GND
MAX. 550 ft (170 m)
MIN. 14 AWG (2.5 mm ) 2
MAX. 1300 ft (400 m)
MIN.20 AWG (0.5 mm ) 2
0 TO 10 Vdc
GND
24 Vac
EXTERNAL
TRANSFORMER

Analog Inputs

Technical Description

The analog inputs convert data from passive sensors and
active sensors with voltage output. The analog inputs can be
used as current inputs for active sensors, but then an external
resistor parallel to the sensor is necessary. It is also possible
-
to feed digital signals to the analog inputs (see also section
"Sensors and Transducers" on page 14.

Technical Specification

Number: Eight analog inputs
Types of input signals:
NTC 20 kΩ
0 to +10 V (max. +11 V)
0 (4) to 20 mA (with an external resistor of 499 Ω ±0.25%
[see Fig. 22])
Each input is switched automatically via software either as
input for NTC 20 kΩ (low impedance) or voltage source
0...+10V (max. +11 V, high impedance).
NTC 20k ohms: Range = -58 ... +302 °F (-50 ... +150 °C)
Voltage source: Range = 0...10 V
IMPORTANT
The analog inputs are protected against short circuit
and overvoltage up to 24 Vac and 40 Vdc. If any
input is sourced with more than 40 Vdc or negative
voltage, the other inputs will be influenced. This
could result in wrong values.
Passive sensors (NTC 20k ohms)
Room temperature sensor RF 20
Inlet temperature sensor VF 20A
External temperature sensor AF 20
Active sensors (0...10 V):
Duct Humidity Sensor H7011A1000
Duct Humidity Sensor H7012A1009
Active sensors (0 (4) to 20 mA):
Immersion temperature sensor VF 100
Air duct temperature sensor LF 100
230 Vac
120 Vac
Wind sensor:
PRIMARY
Wind sensor WS21
VOLTAGE
Further connections:
Temperature sensor terminal TF26
Solar Sensor SAF 25
VMP Feedback Potentiometer
The characteristic curves for other types of sensors can be
entered manually in the data point description (see Excel 50
User Guide, EN2B-0137GE51).
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