Electronics AC-24 - Manual (Page 4)

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I. To set the alarm bandwidth push (1-4) and ▼ or ▲. The alarm bandwidth is relative to this
value and is centered at the setpoint command. Typical setting is 5% of Full Scale (FS).
J. Adjust the alarm delay time by pushing (2-17) and ▼ or ▲. Typically setting is 5 seconds.
5. OPERATION
Operation consists of controlling motor amps by modulating the shot flow rate through the
MagnaValve and transmitting an alarm signal when motor amps is above or below the desired
amperage. The servo circuit controls the output voltage signal for the MagnaValve by compar-
ing the setpoint command with the actual motor amps.
A. SETPOINT
1. Setpoint may be adjusted at any time, either with or without the enable signal.
2. To set desired motor amps in the local setpoint mode be sure the indicator (1-9) is on.
If it is not on then push (2-27). Next, push the setpoint button(1-8) and the ▼ or ▲ but-
tons. The setpoint value will be shown in the digital display (1-1).
3. To set desire motor amps in the remote setpoint mode push (2-19) until the indicator (1
-10) is on.
B. ENABLE MODE: The enable mode button (2-22) controls the operating modes that are
displayed by indicators “Off” (1-5), “Ready” (1-6) and “On” (1-7). Push the Mode button (2
-22 to go through the sequences of Off-Ready-On as shown by the LEDs.
1. Enable mode “Off”: In this mode the MagnaValve will stay turned off, even if an enable
signal is received.
2. Enable mode “On”: In this mode the MagnaValve will be turned on whether or not the
enable signal is present.
3.
Enable mode “Ready”: In this mode the MagnaValve will only be turned on if the en-
able signal is received.
C. ENABLE DELAY:
The Enable Delay (2-30) is factory set to zero. This feature is used only when a time delay
is required after the receipt of the enable signal before the MagnaValve is activated. This
feature is typically not used in wheel blast applications of the MagnaValve. To change the
setting push Enable Delay (2-30) and ▼ or▲
D. ALARM:
High and low alarm conditions are shown by LEDs (1-3) and (1-2).
1. The alarm bandwidth may be calculated relative to either full scale (FS) or setpoint
(SP) as shown by indicators (2-15) and (2-14).
2. To change from one alarm band mode to the other push (2-16).
3. The alarm bandwidth is adjustable from 0 to 50% of full-scale and is factory set at 5%.
Customer may readjust to another value as desired.
4. The midpoint of the alarm band automatically follows the setpoint setting.
5. To increase or decrease the alarm band push button (2-16) and ▼ or ▲.
6. The alarm circuit is only activated when the servo is “on” and the control is enabled.
When the control is enabled, the “Enable On” LED (1-4), on the front panel will be on.
7. The alarm relay contacts will activate after a short time delay (see next section for
alarm delay).
8. The alarm function can be inhibited by applying an alarm reset signal (24Vdc) to termi-
nal 12.
9. The alarm band, usually set at 5% of full scale, will track the motor amps setpoint set-