Medrad ProVis Mark V, Service Manual

Page: 68 / 143

Imaging System Interface
14 - 7
ISI Card
(with Siemens Z5 Option)
When JU5 is set to the Z5 option (Siemens Interface), card operation is
altered as outlined below.
NOTE: The default interface configuration of all Mark V ProVis
Injection Systems is the Universal Interface Mode.
Injector Arming When the injector is armed, a high signal (+5V) is supplied to U5D, pins
12 and 13, which produces a low (0V or ground) at pin 11. The low is
directly coupled to U4A pin 2, producing a high output at U4A pin 3. The
low causes relay K1 to energize, thus sup26VDC through con-
nector J40 pin 4, to one side of the coil for relay SR4 in the Siemens
equipment interface. The other side of SR4 is connected to Buffered
Ground (BGND) through J40 pin 3. When SR4 energizes, +26VDC is
supplied to one side of coils of Siemens interface relays SR1, SR2, and
SR3.
Injection Initiation In this interface mode, the injection is initiated by the Siemens imaging
equipment. When the Injector Start command is initiated (on the Sie-
mens equipment), relays SR1, SR2, and SR3 energize, supplying
+26VDC to the coils of relay K2 on the ISI Card. The other side of the
coil is connected to BGND through JU5, pins 5 and 6. When K2 ener-
gizes, BGND is supplied to J40 pin 2. Internal to the interface cable
(XMC 970, 971, 972, or 973) is a jumper between J40 pin 2 and 9 (J40
pin 9 is the Remote Start), thus when K2 energizes, BGND is supplied
to J40 pin 9 through J40 pin 2.