SSI SPR-3 Pulse Isolation Relay Instruction Manual
- June 9, 2024
- SSI
Table of Contents
INSTRUCTION SHEET
SPR-3 PULSE ISOLATION RELAY
MOUNTING POSITION
The SPR-3 can be mounted in any position.
POWER INPUT – The SPR-3 is powered by an AC voltage of between 120 and
277 volts. Connect the AC line’s “hot” wire to the LINE terminal. Connect the
AC line’s “neutral” wire to the NEU terminal. Connect GND to Ground. If a true
neutral does not exist at the meter, connect both NEU and GND to Ground. The
Ground terminal must be connected for proper noise immunity.
METER CONNECTIONS – The SPR-3 can be set for either a 2-Wire(Form A) or
3-Wire(Form C) input. For 3 Wire (Form C) input mode, connect the SPR-3’s
“Kin”, “Yin” and “Zin” input terminals to the meter’s “K”, “Y” and “Z”
terminals. In the 2 Wire (Form A) mode, connect the “Kin” and “Yin” terminals
to the meter’s “K” and “Y” terminals. The SPR-3’s “Kin” terminal is the common
return. The +13VDC wetting voltage is “pulled-up” internally on the SPR-3’s
Yin and Zin terminals. Each alternating closure of the meter’s Y and Z output
will pull down each input line to the common return. Put Jumper J1 in the
correct position for the input mode desired: Left=2-Wire (A), Right=3-Wire
(C).The RED LED indicates that the KY input is closed and corresponding K-Y
output is closed. The GREEN LED indicates that the KZ input is closed and the
corresponding K-Z output is closed.
PULSE OUTPUTS – Three Form C (3-wire) isolated outputs are provided on
the SPR-3. Transient voltage protection for the contacts of each relay is
provided by MOVs on board. The output loads should be limited to 100 mA at 250
VAC/350VDC. Maximum Output power dissipation is limited to 800mW max. Outputs
are protected by fuses F1, F2 and F3. One-tenth(1/10) Amp fuses are supplied
standard. The SPR-3’s outputs may be configured for either Long or Short
output pulses. Selector Jumper J2 selects the long or short output mode for
all outputs. In the Long mode, output pulses are the same width as input
pulses. In the Short mode, output pulses are fixed at 100mS in length. Put
Jumper J2 in the desired output mode. See Page 2 for description of these
modes.
WORKING WITH THE SPR-3 RELAY
OPERATING MODES : The SPR-3 Repeating Pulse Relay allows the outputs to be configured for either the “Long” or “Short” pulse output mode. In the Long mode, the outputs simply follow the input. Output pulse widths are equal to input pulse widths. With the “long” output configuration selected, pulse speeds of up to 72,000 pulses per hour (20/sec) are possible. Figure 1 below shows the timing diagram for the “long” output mode.
In the Short output mode, shown in Figure 2 below, an output pulse (K-Y closure) with a fixed width (T1) of 100mS occurs each time the input is triggered. Correspondingly, the K-Z output opens for 100mS (T2) each time the input is triggered. In the “short” mode, the output pulse rate is limited to 9 pulses per second, or about 32,400 pulses per hour.
If the input pulse rate is greater than 9 pulses per second, it is recommended that the LONG pulse output mode be used. Contact the factory for technical support at (888)272-9336.
SPR-3 Wiring Diagram
SPR-3WiringDiagram_2022.vsd
Brayden Automation Corp./ Solid State Instruments div.
6230 Aviation Circle
Loveland, CO 80538
(970)461-9600
support@brayden.com
www.solidstateinstruments.com
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