8.- WIRING
8.1.- POWER SUPPLY, RECOMMENDED WIRING
Main switch
FUSE and spare fuse.
8.2.- PROTECTION FUSES
The unit has a protection fuse located on the power supply socket. If this fuse must be replaced or changed because the power supply is changed, use the
POWER SUPPLY
115 Vac (230 Vac Optional).
Power | Fuse |
Supply | value |
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230 Vac | 0.2 A |
115 Vac | 0.4 A |
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TABLE 4
8.3.- CONTROL LINES, ALARM AND SERIAL OUTPUT |
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Control lines connector |
| Alarm connector | Serial RS422 connector | |||
9 | 1 |
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| A | 1 | 6 |
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| B |
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| C | 5 | 9 |
15 | 8 |
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| D |
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| 1.- | Serial A. | |
1.- | Vexc. |
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9.- | Vexc. |
| 2.- | Serial B. | ||
2.- | Vexc. |
| 3.- | No connection | ||
3.- | Start | 10.- | Stop | A : + Alarm | 4.- | No connection |
4.- | GND | 11.- | Reset | 5.- | GND | |
5.- | GND | 12.- | GND | B : No connection | 6.- | No connection |
6.- | Minutes | 13.- | Seconds | C : No connection | 7.- | No connection |
7.- | GND | 14.- | Hours | D : - Alarm | 8.- | No connection |
8.- | No connection | 15.- | GND |
| 9.- | No connection. |
8.4.- NOTES
The HOURS, MINUTES & SECONDS inputs are for contact closure to GND, and are pulled up to the auxiliary 15 volt rail through 4.7 KΩ .
The STOP, START and RESET inputs are normally configured to be pulled up to the auxiliary 15 volt rail through 1 KΩ, but may be internally jumpered to be pulled to GND through 1 KΩ , or pulled to GND through a high resistance of 100 kΩ .
Debouncing for 200 mS time constant is normally incorporated on the three control inputs, but may be disabled by removing internal jumpers.
Vexc is the Excitation Voltage for sensors supplied by the instrument (pins 1, 2 & 9). The connections to Serial A, Serial B and GND are for the RS422 data output.
Run time uncertainty
The control inputs are sensed eight times per second, but the actual run time clock is incremented or decremented in synchronism with the built in real time clock once per second.
This means that each start/stop condition may be inaccurate by up to one second.
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