12
Signet 8900 Multi-Parameter
6. Wiring
All wiring connections to the 8900 are made via the removable terminals of the plug-in modules. This section contains instructions and
diagrams for wiring each type of module. Several helpful tables, explanations and recommendations are also provided. In general:
•
Do not allow any AC leads that may be connected to the Power Module, or to optional internal relays, to come in contact with low
voltage wiring.
•
Terminals accept 12 to 24 AWG wire.
•
Strip 10 to 12 mm (0.4 to 0.5 in.) of insulation from wire tips and tin bare ends to eliminate fraying.
•
Use ferrules when connecting more than one wire to a single terminal.
•
Insert wire tip or ferrule completely into the terminal and secure with the screw.
•
The I/O Module provides the terminals for sensor inputs, optional external relays, and optional Analog Outputs 1 & 2.
•
These modules (3-8900.401-X) support frequency and digital (S
3
L) sensor input signal types. External relays are controlled via
digital (S
3
L) and connect to the I/O Module just as if they were digital (S
3
L) sensors. External relays do NOT consume a sensor
input channel.
•
Refer to Section 6.4: Output Module for wiring optional Analog Outputs 1 & 2.
6.1 Signal Type: Frequency
The maximum allowable cable length for fl ow sensors with frequency output is dependent upon the output signal strength of the
sensors themselves, and the degree to which the signals are susceptible to EMI or "noise". This is largely a function of whether the
sensors are self-powered, or powered by an external source.
All of the sensors in the table below are compatible with the 8900. The three models limited to 60 m (200 ft) are self-powered sensors.
The 8900 automatically provides power to the others via the I/O Module (normal sensor wiring).
These maximum recommended cable lengths apply to individual sensors and are completely independent of one another. Additionally,
these cable lengths have no relevance to any digital (S
3
L) devices that may also be connected to the I/O Module.
Flow sensor models with Frequency Output
Maximum Cable Length 515
525
2000
2100
2507
2536
2537 2540
2551
2552
60 m (200 ft)
X
X
305 m (1000 ft)
X
X
X
X
X
X
X X
Frequency Input Wiring
The 8900 accepts one or two frequency inputs. Each input will occupy one channel.
The frequency input connected to terminals 1-2-3 will be identifi ed in the 8900 menu as "Freq. in 1."
The frequency input connected to terminals 4-5-7 will be identifi ed in the 8900 menu as "Freq. in 2."
3-8900.621C
I/O Module 3-8900.401-X
1
2
3
4
5
6
7
8
9
10
11
12
13
14
+5VDC (Black)
Freq. Input (Red)
GND (Shield)
+5VDC (Black)
Freq. Input 2 (Red)
S L (Red)
GND (White/Shield)
+5VDC (Black)
S L (Red)
GND (White/Shield)
3
3
Analog Output 1
Analog Output 2
(if applicable)
(if applicable)
Frequency
Input
1
Frequency
Input 2
OR
S3L
Input
2
S3L
Input
1
+
-
+
-
