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MACHI NE CONT ROL M36 MACH INE CO NTROL E NCLOS URE 7.14 Technical Reference Manual Chapter Issue 8 O ct 06 Dipswi tch Settings Use t he following graphi c and tables to determine the correc t dipswi tch settin gs: Figur…
MACHINE CONTROL
M36 MACHINE CONTROL ENCLOSURE
Chapter Issue 8 Oct 06 Technical Reference Manual 7.13
Dual Stepper Drive
Card
CAUTION
ANTI-STATIC HANDLING.
Standard precautions must be adhered to when
handling electronic cards and configuring and inserting into the enclo-
sures.
The dual stepper drive card consists of two identical stepper motor drive circuits
used to drive two stepper motors, in half-step mode.
Each of the twin channels of this card consists of an IC (A3977SED) which
combines the conversion of the Step and Direction inputs into control signals for
the output to the stepper motor. These control signals sequence the current in
each of a pair of DMOS (Diffused Metal Oxide Semiconductor) H-bridge motor
drivers.
The card is connected to both the +24V SW and +24V US supplies. The
switched (SW) supply is protected by a diode-fuse transient suppressor circuit.
The diode operates over an extremely short time period, enabling the circuit to
absorb voltage spikes without rupturing the fuse (F1 - 4Amp). If a sustained
voltage is experienced above its rating, the fuse ruptures. The +24V US is used
to produce an internally regulated +5.5V (VCC and VDD).
Whilst the stepper motor is stationary, the card switches to half power to
minimize power consumption.
The card utilizes the mixed decay feature of the IC to achieve the best sinusoidal
motor current waveform for stepper motors. This decreases current ripple and
hence decreases motor heating.
Each channel has a separate dipswitch which enables various circuit functions
and are shown in the table below:
Dipswitch Function
1 Enables Full/Half/Quarter/Eighth Step Operation
2 Enables Full/Half/Quarter/Eighth Step Operation
3 Half Power Timer Enable
4INV_STEP
5INV_DIR
6 Sets Motor Current Output
7 Sets Motor Current Output
8 Sets Motor Current Output
9 Percent Fast Decay_0
10 Percent Fast Decay_1
MACHINE CONTROL
M36 MACHINE CONTROL ENCLOSURE
7.14 Technical Reference Manual Chapter Issue 8 Oct 06
Dipswitch Settings Use the following graphic and tables to determine the correct dipswitch settings:
Figure 7-7 Dual Stepper Drive Card
Card Position and Dipswitch
Switch Positions (Standard Machine)
12345678910
Slot X1 - SW 1 OFF ON ON ON ON OFF ON ON ON OFF
Slot X1 - SW 2 OFF ON ON ON ON OFF ON ON ON OFF
Slot X2 - SW 1 OFF ON ON ON ON OFF ON ON ON OFF
Slot X2 - SW 2 OFF ON ON ON ON OFF ON ON ON OFF
Slot X3 - SW 1 OFF ON ON ON ON OFF ON ON ON OFF
Slot X3 - SW 2 OFF ON ON ON ON OFF ON ON ON OFF
Card Position and Dipswitch
Switch Positions (RTC Machine)
12345678910
Slot X1 - SW 1 OFF ON ON ON ON OFF ON ON ON OFF
Slot X1 - SW 2 OFF ON ON ON ON OFF ON ON ON OFF
Slot X2 - SW 1 OFF ON ON ON ON OFF ON ON ON OFF
Slot X2 - SW 2 OFF ON ON ON ON OFF ON ON ON OFF
Slot X3 - SW 1 OFF ON ON ON ON OFF ON ON ON OFF
Slot X3 - SW 2 OFF ON ON ON ON ON OFF OFF ON OFF
12
3
4
56
7
8
9
10
SW1
12
3
4
56
7
8
9
10
ON
ON
SW2
5V Regulator
Fuse F1
MACHINE CONTROL
M36 MACHINE CONTROL ENCLOSURE
Chapter Issue 8 Oct 06 Technical Reference Manual 7.15
Stepper Drive Card
Edge Connector
The edge connector connects the card to the backplane of the enclosure.
Pin No. Row a Row c
2 CH1 B- CH2 B-
4 CH1 B+ CH2 B+
6 CH1 A- CH2 A-
8 CH1 A+ CH2 A+
10 24V SW 24V SW
12 24V US 24V SW
14 24V US 24V SW
16 GND GND
18 GND GND
20 N/C N/C
22 N/C N/C
24 IDAT ICLK
26 IVPP DIR1
28 VCC OUT STEP1
30 DIR2 STEP2
32 N/C N/C
a
c
2 32
Keyway
4