Synrad Firestar TI Series User Manual

technical reference
325Synrad Firestar ti-Series operator’s manual
DB-9 connections (SA models only)
Figure 3-20 illustrates the connections for fan speed control when using customer-supplied 48 VDC cool-
ing fans. Connect the positive (+) fan lead to Pin 4 or Pin 8, Fan Power, +48 VDC, and connect the
negative (–) fan lead to Pin 5 or Pin 9, Fan Power Return.
If fan speed control is not desired, connect the negative (–) fan leads to Pin 6 or Pin 7, Signal Ground.
Important Note: The total current draw of both fans must not exceed 1.0 A to prevent tripping the
internal 1.1 A self-resetting fuse.
Figure 3-20 48 VDC fan connections
Note: Some types of cooling fans are not designed for PWM control and will stall at low speeds.
SYNRAD has tested Delta EFB1248SHE cooling fans with good results.
Isolated cooling fan connections
To connect cooling fans operating at voltages other than 48 VDC or with currents greater than 1.0 A,
a customer-designed isolation circuit like that shown in Figure 3-21 could power almost any type of DC
cooling fan (with a suitably sized resistor and optoisolator device) while minimizing voltage or current
spikes that might damage the laser’s control board.
(4) FAN POWER, +48 VDC
(5) FAN POWER RETURN
(8) FAN POWER, +48 VDC
(9) FAN POWER RETURN
DB-9 PINS
DC
FAN
DC
FAN
+
+
–
–
Figure 3-21 Alternate fan connections
(4) FAN POWER, +48 VDC
(5) FAN POWER RETURN
DB-9 PINS
Optoisolator
Resistor
DC
FAN
+–
+ VDC
(8) FAN POWER, +48 VDC
(9) FAN POWER RETURN
Optoisolator
Resistor
DC
FAN
+
–
+ VDC

Synrad Firestar TI Series Specifications

General

Brand	Synrad
Model	Firestar TI Series
Category	Medical Equipment
Language	English