MKS Baratron 740C, Руководство пользователя, Страница: 70 / 84

How To Configure the Trip Points Chapter Five: Type R7xxC Relay System
60
Contact Rating
The contact rating for the relays is 30 Volts AC/DC @ 2 Amp resistive.
How To Configure the Trip Points
To change the operation of a relay, that is, to select the pressure condition that will energize the
relay, you must change its jumper setting on the PC board inside of the Relay Module. The Relay
Module is enclosed in a two-piece cover that snaps together.
To access the PC board and adjust the trip point jumpers:
1. Disconnect the interface cable from the Relay Module and the transducer.
2. Remove the 2 hex nuts from the 9-pin Type “D” connector on the transducer and detach
the Relay Module from the transducer.
It is not necessary to remove the bracket from the Relay Module.
3. Firmly grasp the Relay Module so that the rear panel of the unit faces up.
4. Insert a coin, flathead screwdriver, or the thumb nail of your other hand, at any point
along the cover seam and gently bend the side of the bottom cover out.
Refer to Figure 16, page 55, for the location of the cover seam.
5 Gently lift the cover up and off of the unit.
The PC board is affixed to the inside of the front panel of the Relay Module and is visible
as soon as the bottom cover is removed.
6. Locate the appropriate jumper(s) for the relay you want to change, and adjust the
jumper(s) as required.
Refer to Figure 21, page 61, for information on the location and position of the jumpers.
7. Align the bottom cover so that the long edge and the side edges fit into the grooves on the
inside of the front cover.
8. Press the unit to snap the two cover pieces together.
9. Reattach the Relay Module to the transducer.
Refer to Setup , page 54, for instructions.
10. Reconnect the interface cable removed in step 1.