Liquid Controls SP2850 (MS-649) - Manual (Page 3)

Sponsler, Inc. Model SP2850-TC with MS649 Page 3 DOC#: MN-2850
RESET: Front push button: `CLEAR’ resets displayed batch counter and control input.
Remote: 4 to 30 VDC positive edge resets batch counter and control output.
Impedance: 10K to ground (-DC)
Minimum pulse: 5 msec.
START: Front push button: `START’: When pressed, the unit displays, `STARTED’ and both relays energize.
The relays will remain energized until the preset values are reached or the `STOP’ is activated.
Remote: 4 to 30 VDC positive edge starts unit as described above.
Impedance: 10K to ground (-DC)
Minimum pulse: 5 msec.
TEMPERATURE:
Operating: -40
°F (-40°C) to +158°F (+70°C)
Storage: -40
°F (-40°C) to +200°F (+93°C)
FACTORED OUTPUT: The unit gives one pulse out for each factored count. The open collector sinks 30 VDC
maximum to 1 volt at 100mA maximum. Output speed is user selectable (see table below). An internal buffer holds
up to 10,000 pulses for output at the selected frequency before `DATALOST’ flashes, indicating pulses are lost. If
factored rate exceeds 7 digits `RFF...’ flashes. These alarms indicate that speed has been exceeded.
Speed (HZ) 10 200 2000 20000
Min. on/off (msec) 47.5 2.0 0.2 0.013
CONTROL OUTPUTS: (Each of two outputs)
1. NPN Transistor Version: Open Collector sinks max. 250mA from 30 VDC when active. (When relay is used,
10 VDC is provided at transistor outputs through relay coil. If greater than 2mA is used, relay will remain
energized. Applying greater than 10 VDC may destroy unit. Transistor will sink 100mA in `ON’ state)
2. SPDT Relay Version: 10A 120/240 VAC or 28 VDC (Standard).
ANALOG OUTPUT:
Current Outputs:
A sinking driver generated a corresponding linear current through the external devices, updating
with each update of the rate. Accuracy is +/- 100
µA worst case. Compliance voltage must be 3 to 24 VDC, non
inductive. (The unit can provide the DC source as long as the drop across any device being driven does not exceed
21V)
Voltage Outputs: When the voltage option is ordered, a controlled voltage output is located at terminal 3 and
referenced to pin 12 (ground). Accuracy is .1% @ 20
°C (max. Drift .01% / °C).
SECURITY: This output is not available when using RTD input. The unit has a missing pulse detector. The user
selects the amount of time (1 to 99 sec.) that the unit will ‘wait’ for input pulses. If the unit doesn’t receive pulses
within the selected time, the unit will display ‘SECURITY’ and both relays drop out. (00 disables the security feature;
Entering the lockout code returns the unit to the run mode).
Security output:
When the unit is in ‘SECURITY’, a normally high (5V) at pin 8 goes low (< 0.4V).
PRESETS: The user may enter two numbers to set up the batch counter, Preset and Prewarn. The Prewarn value
is the number of counts before the Preset value that the Prewarn relay will de-activate. For instance, a 100 gallon
batch with a valve to close and slow down flow 25 gallons before the end of the batch is desired, the preset is 100,
and the prewarn is 25. When the start is activated, the relays energize simultaneously to start flow. When the
counter reaches 75 (25 before 100) the prewarn relay drops out. When the counter reaches 100, the preset relay
drops out. The preset values can be viewed or changed via the menu (when stopped).
OPERATION USING EZ PRE: The EZ PRE (easy preset) programming option has been designed for users who
are changing the batch amount often. By choosing EZ PRE, the user has fewer buttons to push to change the
Preset. The EZ PRE features functions as follows:
Initially, the preset is set to zero upon entering EZ-PRE mode. A new batch PRESET will be entered after pressing
CLR. Once the unit is started, the relays engage and the unit begins to count. When the batch is complete the relays
drop out and the display flashes zero. To start another run, the user must enter a new value for the Preset by simply
keying in the new Preset value. The user may press CLR to clear the Preset to zero, however, the Preset must
comply with the PREWARN value before the unit will start. Pressing START will automatically reset the count and
start a new batch using the new Preset value.