Liquid Controls SP2850 (MS-649) - Manual (Page 27)

Sponsler, Inc. Model SP2850-TC with MS649 Page 27 DOC#: MN-2850
TROUBLESHOOTING GUIDE
PROBLEM POSSIBLE CAUSES SOLUTIONS
Power is applied but the display
does not light. 1. AC or DC power wiring is incorrect.
2. Excessive current draw or short on
12 volt output.
3. Damaged unit. 1. Recheck power wiring.
2. Recheck output wiring and insure
that all peripheral devices powered
by the 12 volt output do not exceed
a 100mA current draw.
3. Call factory for RMA.
Unit works but occasionally the
display freezes or displays erratic
counts. Line noise is effecting the processor
due to a current spike or surge. Use a different power supply or install
a surge suppressor.
Rate is erratic or greatly
fluctuating. Input pulse frequency is fluctuating. Increase the `WEIGHT’ value to
average or dampen the rate display.
Unit displaying `DATALOST’. Pulse input is faster than scaled pulse
output setting. Increase the `OUTFREQ’ value.
Unit displaying `PREWRONG’. Preset value is larger than the
Prewarn value. Recheck Preset and Prewarn values.
(See Error Messages)
Unit displaying `SECURITY’. 1. Unit was started and no pulses
were received.
2. Defective flowmeter. Recheck input wiring, sending device
and `SECUR’ time value (See Error
Messages).
Unit displaying `ERROR TP’. 1. Temperature input is out of range.
(I.e. below -200
°C or above 850°C)
2. Defective temperature sensor.
Recheck temperature input wiring and
sending device. (See Error Messages)
Unit displaying `ERROR DN’ The density input is out of range.
(i.e. below 4mA or above 20mA) Recheck density input wiring and
sending device (See Error Messages).
UNITS OF MEASURE TABLE
Compatible units of measure must be used when entering data and when calculating the coefficient of expansion.
Acceptable combinations for the units of entry include:
Table 1
K-Factor
gallon
pulses
ft
3
pulses
liter
pulses
M
3
pulses
Ref Density
gallon
lbs.
ft
3
lbs
liter
Kg.
M
3
Kg.
Mass Display lbs lbs. Kg. Kg.
Volume Display gallon ft
3
liter M
3
EQUATIONS
Volume Correction Factor (VCF): VCF = 1 - [Coefficient of Expansion X (T
flow
- T
ref
)]
Density: Density = Reference Density C VCF (where: Density is in units of mass per unit volume)
Totalizer: Corrected Volume Total = (Input Pulses X VCF)
K-Factor
Mass Total = (Input Pulses X Density)
K-Factor
Ratemeter: Corrective Volume Rate= (Frequency X VCF)
K-Factor
Mass Total = (Frequency X Density)
K-Factor
(Where the various time bases for rate are implied in the rate K-Factor)