Tektronix Keithley PCM3 Power Control Board/Cable Rev. C User manual
PCM3
Power Control Board/Cable
The PCM3 is a general purpose remote relay card for the control of power AC and DC
devices. Ideal for demanding control applications in scientific and industrial automation
systems, the KM3 permits the direct interface of relays, heaters, motors, actuators, and
a wide variety of AC and DC devices-over the full range of voltages from 10 to 280V.
The KM3 is the external relay board which is normally included with the KM2
module set. It is an option for the System 570, and can be used as a spare relay board
for the PCM2. The card is fully optoisolated and protected. All connections are made to
high-current screw terminals, and the relays are industry standard, plug-in, solid-state
elements, so the system is readily reconfigured as the application requires.
The KM3 is a remote unit which keeps potentially hazardous and noisy currents outside the system environment. The remote assembly can be mounted in a variety of
positions.
The PCM3 provides up to 16 channels of power interface. Each channel can be configured with plug in relays for DC or AC output. Each channel is short-circuit protected
with plug-in fuses, and isolated to 1OOOV AC. Control channels can switch up to 3A.
LED indicators are provided to indicate channel status. A ribbon cable is used to connect the remote card to the interface board.
WARNING: The relay card should not be handled unless all power to external circuits
has been disconnected. For maximum safety, mount the relay card in an enclosure.
User-Configured Components
The PCM3 has provisions for 16 channels of plug-in relays. Two relay types can be accomodated: the AC output relay and the DC output relay. Either relay type can be installed in any channel position.
Each channel is interfaced with two screw terminals on the remote card.
Table 1. User-Configured Components on the PCM3
Name
Screw Terminals J161
Screw Terminals f
Cable 1
Fuses
Relays
Jumper
Designation Function
CESl
See Figure 1
See Figure 1
See Figure 1
Screw Terminals for connection of AC/DC output channels (32 terminals)
External +5V power source connection (2 terminals)
Linking cable between the System 570 and the relay
card assembly (50 pin)
Per channel current limit plug-in wire fuses, 5A
Plug-in modular relays
+5V power jumper
Document Number: 500-939-01 Rev. C
PcM3-1
PCM3
Relay No.
PCM2
Channel
I I I I I I I I I I I I I I I
0 1
0 1 2
2 3 4 5
3 4 5
6 7 8
6 7
9 10 11 12 13 14 15
8 9
10 11 12 13 14 15
575/576
Port &
Channel
Port C
16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
REPLACEABLE PARTS
I
I
Customer to specify quantity and type of relay(s)
~
RELAY SELECTION CHART
Port D