INSTALLATION GUIDE
NI CB-37F-HVD
High-Voltage DIN Rail Screw Terminal Block for Rack Mount Users
This guide describes how to install and use the National Instruments
CB-37F-HVD 37-pin D-SUB high-voltage (150 V) DIN rail terminal
block. The CB-37F-HVD has screw terminals for connecting up to 37 I/O
signals. Use 12–30 AWG wire to connect to the CB-37F-HVD screw
terminals.
Using the Terminal Block Safely with High Voltage
Signals
The CB-37F-HVD is UL recognized. You can use the CB-37F-HVD
terminal block with low-voltage or high-voltage products up to 150 V.
When hazardous voltages (>30 Vrms, 42.4 V
any terminal, all terminals must be considered hazardous. Ensure that
external wiring or any circuits connected to the device are properly
insulated from human contact.
, 60 VDC) are present on
pk
Caution Failure to adhere to the following precautionary steps when connecting the cable
to a high-voltage NI device can result in electrical shock or death.
Caution Before you begin installation, ensure that no high-voltage signals are connected
to your accessory.
Caution Signal connections should be made by a qualified technician or service personnel.
Caution When using this product with UL listed high-voltage PCI or PXI devices, the
connecting cable must be keyed for hazardous voltage (>30 Vrms, 42.4 V
using the 37-Pin High-Voltage Accessory Kit. This kit is provided with the PCI/PXI device
or can be ordered separately for replacement (part number 779445-01). Refer to the 37-Pin
High-Voltage Accessory Safety Kit Installation Guide provided in the kit for installation
instructions.
, 60 VDC)
pk
When using the CB-37F-HVD with hazardous voltages (>30 Vrms,
42.4 V
, 60 VDC), it is required that all signal wires must be strain
pk
relieved, and the CB-37F-HVD must be placed in a UL listed,
suitably-rated NEMA or IP enclosure, shown in Figure 1, which is
grounded to a safety earth ground. The enclosure must be entirely enclosed
and none of the parts should be accessible to the user when the system is
running.
Figure 1. CB-37F-HVD and UL Listed Enclosure
What You Need to Get Started
The following items are necessary for setting up and using the
CB-37F-HVD terminal block:
❑ Hardware
– CB-37F-HVD terminal block
–DAQ device
– SH37F-37M-x 37-pin female-to-male shielded I/O cable
or other 37-pin cable rated to 150 V
– Cabling and sensors as required for your application
– 37-Pin High-Voltage Accessory Safety Kit (supplied with
high-voltage devices)
– DIN Rail (and DIN rail mounting kit)
– Zip ties
– UL listed industrial enclosure
cabinet
1
, electrical cabinet, or rack-mount
1
National Instruments sells two UL listed industrial enclosures: FP-ENC1 industrial enclosure with polycarbonate window
(part number 777596-01) and NI FP-ENC1 industrial enclosure with solid metal door (part number 777596-02).
NI CB-37F-HVD Installation Guide 2 ni.com
❑ Documentation (available at ni.com/manuals)
– Read Me First: Safety and Radio-Frequency Interference
– DAQ Getting Started Guide
– Documentation for your DAQ device
– 37-Pin High-Voltage Accessory Safety Kit Installation Guide
(supplied with the 37-Pin High-Voltage Accessory Safety Kit)
❑ Tool s
– 1/8 in. flathead screwdriver
– Wire insulation stripper
Connecting the Signals
To connect signals to the CB-37F-HVD terminal block, refer to Figure 2
while completing the following steps.
Note Refer to the Read Me First: Safety and Radio-Frequency Interference document
before removing equipment covers or connecting or disconnecting any signal wires.
© National Instruments Corporation 3 NI CB-37F-HVD Installation Guide
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