Delta Tau analog output interface board ACC-8E connection

The Accessory 8E for the PMAC2 family of controllers provides the pinouts for 2 axes with analog-input amplifiers. The ACC-8E board has a single flat-cable connection to the PMAC2.

The ACC-8E has 4 18-bit D/A converters (DACs) to command the amplifiers with optical isolation from PMAC circuitry. The analog outputs have a range of -10V to +10V, and a maximum current output of 10 mA. These outputs are clamped to 0V by on-board hardware on loss of any of the on-board power-supplies (+15V, -15V, or +5V) by the amplifier-enable signal going false, or by tripping of PMAC2's watchdog timer.

The ACC-8E requires a +/-12V to +/-15V power supply provided through TB1 or pins 13-16 of J4. Often, this will be provided from the bias power supply of the amplifier. This supply should be isolated from the PMAC2's 5V supply. The current requirements are under 200 mA for each voltage.

Connection to amplifiers can be made through J4 for both axis or TB5 for axis 1 and TB7 for axis2, pinouts for all connectors are shown on Table 4.2.

Table 4.2: ACC-8E J4 connector.

ACC-8E						Piezo amplifier
J4 (16-Pin Header)	TB5 (12-Pin Phoenix)	TB7 (12-Pin Phoenix)	TB1 (4-Pin Phoenix)	Function	Description
1	1			DAC1A+ Out	Phase A Analog Out +/-10V, ref to AGND
2	2			DAC1A- Out	Phase A Analog Out
3	4			DAC1B+ Out	Phase B Analog Out	not used
4	5			DAC1B- Out	Phase B Analog Out	not used
5		1		DAC2A+ Out	Phase A Analog Out
6		2		DAC2A- Out	Phase A Analog Out
7		4		DAC2B+ Out	Phase B Analog Out	not used
8		5		DAC2B- Out	Phase B Analog Out	not used
9	7			AMP_ENA1+ Out	Amplifier Enable	not used?
10	8			AMP_ENA1+ Out	Amplifier Enable	not used?
11		7		AMP_ENA2+ Out	Amplifier Enable	not used?
12		8		AMP_ENA2+ Out	Amplifier Enable	not used?
13	3,11	3,11	1	AGND	Analog Reference Voltage
14			2	A+15V	Analog Positive Supply Voltage
15	6,12	6,12	3	AGND	Analog Reference Voltage
16			4	A-15V	Analog Negative Supply Voltage