5. MAINTENANCE, ADJUSTMENTS AND CALIBRATION
Page 167
© 2009 DH Instruments, a Fluke Company
5.14
SUBASSEMBLY DESCRIPTION AND LOCATION
PPCH consists of two modules. The electronic module is mounted on the top of the unit (see Section 5.14.1).
The mechanical module (see Section 5.14.2) is beneath the electronic module.
5.14.1
ELECTRONIC MODULE
1. Power entry and fuse
2a. 12V power supply
2b. +5 V, ±15V power supply
3. Driver
board
4. Mini micro card
5. On-board barometer
Figure 21.
Electronic module, internal view
5.14.1.1
POWER ENTRY AND FUSE
Electrical Power Connector (IEC-320-C13) and main fuse.
Fuse: 1 A, 250 VAC fuse, 5 x 20 mm, time lag type
5.14.1.2
POWER SUPPLIES
+12 V DC (± 2 %) @ 3.3 Amps: For internal and external solenoid valve
actuation, thermal pressure control unit (TPCU), servo-controlled valve stepping
motor supply.
+5 V DC (± 1 %) @ 3.0 Amps; + 15 V DC (± 3 %) @ 2.0 Amps; -15 V DC (± 3 %)
@ 0.35 Amps: For the supply of the micro board and driver board electronics.
Internal power supply fuse not replaceable by operator: 2A, 250 V (UV 440-2
power supply). 3.15A, 250 V (NFS40-7612 power supply).
