Milnor E-P Plus, Reference, Page: 17 / 92

Pellerin Milnor Corporation
11
DANGER:
Electric Shock Hazard —
Contact with high voltage electricity will kill
or seriously injure you. Even with the
Master Switch off
and/or any
Emergency Stop switches off , three-phase power and control circuit
power are still present at several locations within electric boxes and electri-
cal components.
DANGER:
Injury and Damage Hazards — Improper wiring can cause the machine
to malfunction, risking injury to personnel, damage to machine compo-
nents, and damage to goods.
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Electrical and piping connections described in this section must be
made only by qualified, authorized personnel.
�
Lock off and tag out power at the external disconnect switches for the
washer-extractor and for any chemical devices that provide power to the interpret relay
box (if furnished) before proceeding.
�
Do not rely merely on the information in this section when wiring. Consult all applica-
ble electrical schematics.
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Do not reroute or rearrange any wires not specifically permitted by this instruction.
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Do not connect a common wire to ground. Use the common terminal furnished.
CAUTION:
Risk of Poor or Inconsistent Wash Quality —
Injection times of less
than 10 seconds are discouraged because fine adjustments are not possible
and factors such as pump lag time may cause significant variations in the
amount of chemical delivered.
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Size pumps or valves small enough for adequate control (i.e., for lon-
ger injection times).
�
Use two pumps or valves to inject a small or large quantity of the same
chemical, if required.
1.5.1 Maximizing Chemical Injection Precision
BNCJVI01.R01 0000181451 C.2 D.5 B.3 1/2/20 1:16 PM Released
Injection of a consistent amount of chemical is important in controlling wash quality and using
chemicals economically. When chemicals are injected by units of time, as is done with most
washer-extractors, injections of short duration can be imprecise because of two reasons:
• Fine adjustments to the delivered quantity are not possible. For example, if an injection of
three seconds is extended by one second, the quantity delivered is theoretically increased by
more than 30 percent. However, if an injection of 20 seconds is increased by one second, the
theoretical quantity is increased by only five percent.
• Variations in the time between the start of the chemical signal and the start of the chemical de-
livery into the machine can cause significant differences in the quantity of chemical injected.
In this case, if a pump starts more slowly some times than others, or if the delivery tubes are
partially empty at the start of the inject period, the quantity of chemical delivered may vary
significantly. As an example, assume a peristaltic pump moves chemical along the delivery
tube at a rate of three feet per second. If the delivery tube is empty for three feet along its
Commissioning