Generac Power Systems H-100 The Measurement Engine, ‹Analog Channels, ‹Analog Maths

General Information

H-100 Control Panel Technical Manual

THE MEASUREMENT "ENGINE"

The measurement “engine” is the key feature of the system. All the inputs to the controller are processed by this module. Each physical input is measured and the result processed by an individual set of rules that are set via a PC and GenLink. Normally, a product is delivered with the inputs and outputs pre-con- figured and nothing needs to be done, however the manufacturer has provided complete flexibility to each measurement (except where product safety is concerned). The inputs are divided into analog and digital channels.

‹ANALOG CHANNELS

There are 23 analog channels of which 14 have fixed functions. The remaining 9 channels are split between product specific inputs (such as oil temperature), and customer spares. The exact split depends on the product. Table 1 shows the channel allocation.

Some of the 14 fixed channels are “DERIVED” read- ings in that they are calculated from the other read- ings. For example, power is calculated from both volt- age and current. These are not real hardware chan- nels, but they result in an analog reading that can be treated as a “fixed channel” just like any other.

‹ANALOG MATHS

Each of the 23 channels is processed by a set of mea- suring rules using constants that are set via GenLink. Usually these constants can be changed by the cus- tomer. In the following illustration, the measurement is represented by M and the GenLink constants are in italics. The measurement is processed in the fol- lowing order and the result is then stored for cus- tomer display or use.

M = M * Calibration Factor

This is used to calibrate out any reading inaccura- cies where calibration factor is a number such that 1024 is equivalent to 1, so it’s really M * calibration factor/ 1024. GenLink will hide this computation so you can enter floating point numbers such as 1.1 or 0.987 etc.

THEN

M = M processed by function x:

Table 1

CPU
Channel			Derived
No.	Channel Title	Update Rate	Value
7	User Configurable #1 (Usually Oil Temp)	3.84 ms	No
8	User Configurable #2 (Usually Coolant Temp)	3.84 ms	No
9	User Configurable #3 (Usually Oil Pressure)	3.84 ms	No
10	User Configurable #4 (Usually Coolant Level)	3.84 ms	No
11	User Configurable #5 (Usually Fuel level)	3.84 ms	No
12	User Configurable #6 - Spare -	3.84 ms	No
13	User Configurable #7 (Usually throttle position)	3.84 ms	No
14	Special Oxygen sensor	3.84 ms	No
15	Special Battery charge sensor	3.84 ms	No
16	Battery Voltage/ PSU voltages	3.84 ms	No
1	Generator Phase A RMS Current	Phase A ZERO CROSSING	No
2	Generator Phase B RMS Current	Phase B ZERO CROSSING	No
3	Generator Phase C RMS Current	Phase C ZERO CROSSING	No
-	Generator average current	Every Phase ZERO CROSSING	Yes
4	Generator Phase A RMS Voltage	Phase A ZERO CROSSING	No
5	Generator Phase B RMS Voltage	Phase B ZERO CROSSING	No
6	Generator Phase C RMS Voltage	Phase C ZERO CROSSING	No
-	Generator average voltage	Every Phase ZERO CROSSING	Yes
-	Total Generator Power KW	Every Phase ZERO CROSSING	Yes
-	Total Generator Power Factor	Every Phase ZERO CROSSING	Yes
-	Generator Frequency	Every Phase ZERO CROSSING	Yes
-	RPM #1	4 - 8 ms variable (geared)	Yes
-	Oxygen sensor zero crossings	Every O2 ZERO CROSSING	No

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