Holtgreven GSE-355 I.S. - Manual (Page 27)

18
Analog Card Connections
The 16-bit electrically-isolated analog output module provides a highly accurate analog signal, proportional to weight.
This signal can be used for interfacing to PLCs, chart recorders, and other such devices.
See Analog Output Setup on page 23 for analog output software configuration details.
The Model 350/355 contains components which could be damaged by Electrostatic Discharge (ESD) if
serviced improperly. Use proper ESD precautions (wear a wrist strap connected to ground, use grounded
work stations, etc.) when opening the enclosure.
High voltages may exist within the enclosure! To prevent the risk of electrical shock, ALWAYS unplug
the Model 350/355 when opening the enclosure. Installation and servicing of the Model 350/355 should
be performed by authorized and qualified service personnel only.
Never connect or disconnect option board cables while the indicator is powered. Doing so may result in
circuit board damage.
To install the Analog Output Module (350 die cast model):
1. Open the indicator. Remove the four screws from the back of the unit. It may
help to remove the swivel bracket, if installed.
2. Place the back of the indicator, open side down, on a firm surface. Using a
hammer and screwdriver, remove the appropriate knock-out.
It helps to place the screwdriver tip on the knockout pad, rather than in the
groove. The knock-outs do not require much force to remove. If only
installing one option, the left knock-out (as viewed from the rear) should be
removed. A small file may be used to remove any burrs.
3. Flip the back cover over and place the Analog Output Module, component
side down, over the four mounting holes. Install four 10mm screws to a
minimum of 8 in/lb of torque.
Be sure the cable is already attached before installing the card. Also, be sure
the cable is attached to the left-most connector (as viewed from the
component side of the option board). The second connector is for ‘daisy-
chaining’ another option card. The screws used to mount the option card are
self-tapping and will require added torque when first installed.
4. Attach the loose end of the cable to the serial I/O connector (J7) on the main
board or the open connector of a previously installed option card.
J7 is a 10-pin polarized connector. Be sure the cable is not twisted when installed. If this is a second option
card, route the cable to the open connector of the first option card.
5. Reinstall the back cover. Tighten the four screws to a minimum of 8 in/lb torque.
Be sure to avoid ‘pinching’ the cable between the housing halves. Affix all appropriate labels to the back of
the indicator.
Figure 19: Option Board
Installation (Die Cast Model 350)