Electrical Connection; Operation - Teledyne HASTINGS 200 Instruction Manual

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2.5

Electrical Connection:

Ensure that the power switch is turned off. Plug the AC line cord into an acceptable receptacle.

Then plug the 15 pin D connector cable, purchased separately from Hastings Instruments, into the

top of the flow instrument and into the back of the power supply. When looking at the back panel

of the power supply the different channels are numbered from left to right (see Figure 2.2).

2.6

2.6.1

Each controller connected to the Hastings Power Supply has a valve override switch. For normal

operation this will remain in the AUTO position. The CLOSE position will remove power from the

valve, thus shutting off the flow regardless of the command signal. The OPEN position will send

the maximum available voltage to the valve ensuring that it will be wide open, independent of the

command signal. The OPEN position is useful for purging the system. When the soft start method

of valve override has been installed as described in Section 3.2.1, the switch operates by overriding

the command signal. Therefore when monitoring the command signal, the display will over range

high when the valve is opened and over range negative (i.e. -1. - - - ) when the valve is closed.

page 8

V V V V V alv

alve Ov

alv

e Over er er er err r r r r ide

e Ov

ide

Figure 2.2

Figure 2.3

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