Electrical Connections - Signet 8550-1 Installation Manual

3. Electrical Connections

Caution: Failure to fully open terminal jaws before removing wire may permanently damage instrument.
Wiring Procedure
1. Remove 0.5 - 0.625 in. (13-16 mm) of insulation from wire end.
2. Press the orange terminal lever downward with a small screwdriver to open terminal jaws.
3. Insert exposed (non-insulated) wire end in terminal hole until it bottoms out.
4. Release orange terminal lever to secure wire in place. Gently pull on each wire to ensure a good connection.
Wiring Removal Procedure
1. Press the orange terminal lever downward with a small screwdriver to open terminal jaws.
2. When fully open, remove wire from terminal.
Terminals 3 and 4: Loop Power
12-24 VDC ±10% system power
and current loop output.
Max. loop impedance:
50 Ω max. @ 12 V
325 Ω max. @ 18 V
600 Ω max. @ 24 V
System Pwr
4
Loop -
System Pwr
3
Loop +
AUX
2
Power -
AUX
1
Power +
Terminals 1 and 2: AUXILIARY power
Used only if the flow sensor requires
more than 1.5 mA current. For Signet
sensors this is limited to the following
products:
• 2000 • 2507
• 2530 • 2535
• 2540 if mfg. prior to Jan 1999
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Terminals 7-9: Flow sensor input
6
Output -
5
Output +
Internal open-collector
output circuit
S
D
Isolation
Terminals 5 and 6: Open-collector Output
A transistor output, programmable (see CALIBRATE menu) as:
• High or Low setpoint with adjustable hysteresis
• Volumetric pulse
• Frequency based on flow rate
• May be disabled (Off) if not used.
Sensr Gnd
9
(SHIELD)
Sensr IN
8
(RED)
Sensr V+
7
(BLACK)
15Ω
Output --
Output +
‡ SIGNET 8550-1 Flow Transmitter
2
1