Tektronix Keithley PCM1 AC Power Control Module Rev. C User manual
PCMl
AC Power Control Module
The PCMl AC Power Control Module is designed to switch on and off AC line devices
- motors, contactors, lamps, and solenoids - without disturbing the operation of the
computer or the Series 500.
The PCMl consists of two elements: the KM1 card, which plugs into the Series 500
baseboard, and a remote signal connection unit. All AC connection and switching takes
place at the remote unit, keeping potentially dangerous and noisy AC voltage outside of
the system case. An eight-foot ribbon cable links the remote unit to the plug-in module.
The PCMl provides four channels of AC switching output, with each channel accepting
power signals of I2 to 140V AC, at up to 3A. These channels are switched by solid state
relays (with full optical isolation to 1OOOV AC), and are short-circuit protected by fuses.
The remote unit has screw terminals for signal connection, and LED’s to indicate the
status of each channel. The KM1 module may be installed in any available slot.
WARNING: The remote unit should not be handled unless all AC power has been
removed. Mount the remote assembly in an enclosure for maximum safety.
CAUTION: Always turn off the power before installing or removing modules. To
minimize the possibility of EM1 radiation, never operate the system with the mainframe cover removed.
User-Configured Components
The KM1 has two user-configured components: the cable which connects the plug-m
PCMl module to its remote connection unit, and the screw terminals for signal connection (see Table 1).
The linking cable is a lo-contact, flat ribbon cable with connectors at either end. To in-
stall the cable, the small arrows on the cable connectors must be matched with similar
arrows on the module connector and the remote unit connector. Jl31 is the jack on the
interface board, while Pl.32 is the plug on the remote board. The connectors are keyed
so that they can be installed only one way.
The screw terminals located on the remote unit accept 16-24 gauge leads stripped 3116
of an inch.
WARNING: Dangerous user-supplied voltages may be present on the remote unit. Use
normal safety precautions when using the PCMl module.
Document Number: 500-936-01 Rev. C
PCMl-1
Table 1. User-Configured Components on the PCMl Module
Name Designation Function
Screw Terminals
Cable 1
Plug (Remote Board) Pl32
Jack (Interface Board) Jl31
J135
CBl
Figure 1. PCMl Interface Card
Screw terminals for signal connection
Linking cable between plug in module and remote
unit
Connection for CBl on remote board
Connection for CBl on interface board
PCMl-2
0
CHO CHl CH2 CH3
II II /I II /I /I II I
I
FI
@I- __
Jl35
I
PIN I
PI32
0
DSIOI
0
0
DS102
0
OS103
!I
F
103
I
I-
J
K104
O
DS104
1
F
104
1
Figure 2. PCMl Remote Card
Connections
Terminals for the KM1 module are marked on the remote unit. When connecting
leads, the AC power source should be connected in series with the output load and the
connecting screw terminals. A typical connection scheme is illustrated in Figure 3.
CAUTION: Each Channel on the PCMl assembly can control circuits at a maximum of
140V AC, 3A. Exceeding these values may cause damage to the unit.
PCMl-3