Switch Change - Teledyne HASTINGS 200 Instruction Manual

3.1.3 3.1.3 3.1.3 3.1.3 3.1.3
To set the master unit, follow the instructions for adjusting the display in an internal command
configuration; see Section 3.1.1. To set the slave unit, remove the top two screws in the back panel
and slide out the top cover. Turn the EXTERNAL COMMAND dipswitch to the INTERNAL
position per Section 3.3. Turn the COMMAND potentiometer fully clockwise. Set the FLOW/
COMMAND switch to COMMAND. Adjust the DISPLAY-ADJUST potentiometer for the
channel being set until the display reads the desired full scale reading. The DISPLAY-ADJUST
potentiometer is located in the front/center of the PC board (see Figure 3.1). Channel one is on
the right side when looking from the front. Set the decimal point per Section 3.1.4 if required.
Reset the EXTERNAL COMMAND dipswitch to EXTERNAL per Section 3.3 Replace the top
cover.
3.1.4 3.1.4 3.1.4 3.1.4 3.1.4
Remove the two screws that hold the aluminum perforated upper cover in place. Slide the cover
out. The dipswitches are located next to the display terminal strip (see Figure 3.1). Turn on the
desired decimal point for a particular channel by pressing its respective dipswitch down towards the
channel number (OPEN indicates that the switch is off). Switches 1 and 2 are for Channel 1
(Switch 1 provides 2 places to the right of the decimal point, and Switch 2 provides 1 place to the
right of the decimal point). Switches 3 and 4 are for Channel 2
to the right of the decimal point, and Switch 4 provides 1 place to the right of the decimal point).
Switches 5, 6, 7, 8 are used for channels 3 and 4 in the same fashion (see Figure 3.2) for example
and chart below). Reinstall cover if no further modifications are needed.
3.2

Switch Change:

The valve override switches on the front panel of the Hastings Power Supply are normally set up
for an OPEN - AUTO - SHUT configuration. This method results in the voltage on pin 8 of the
connector to the individual flow instrument being forced to different values. +15 VDC drives the
valve open, -15 VDC closes the valve, and if pin 8 is left floating, the valve will be in the flow
control mode. The valve is fast-responding and has rapid recovery when returning to the AUTO
mode.
This option bypasses most of the electronics in the control circuit of the flow controller, including
the soft start circuit. The soft start will be active when changing the command signal if the switch is
in the AUTO mode, but the controller will have overshoot or undershoot when switching to the
AUTO position from the OPEN or SHUT positions. There are jumpers in the power supply
that can be changed to put soft start into the switch. This is accomplished by overriding the
command signal to the HFC unit. See Section 3.2.1 to set up this option. When using this option,
there will be no overshoot or undershoot when switching from SHUT or OPEN to the AUTO
position, but the valve will be slower acting.
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Displa Display y y y y Adjustment for Master Sla Displa Displa Displa Adjustment for Master Sla Adjustment for Master Sla Adjustment for Master Slav v v v v e e e e e Adjustment for Master Sla
Decimal P Decimal P Decimal Point Decimal P Decimal P oint oint oint oint
Switches 3 and 4 are for Channel 2 (Switch 3 provides 2 places Switches 3 and 4 are for Channel 2 Switches 3 and 4 are for Channel 2 Switches 3 and 4 are for Channel 2
Channel Switch Selection
1 1
2
2 3
4
Switches 1 and 2 are for Channel 1 Switches 1 and 2 are for Channel 1 Switches 1 and 2 are for Channel 1 Switches 1 and 2 are for Channel 1
Decimal Position
xx.xx
xxx.x
xx.xx
xxx.x