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Case D - Mechanical Details
All dimensions are in inches (mm)

Overall size: 9.00 x 4.87 x 3.28
                (228.6 x 123.7 x 83.8)
Weight: 7.5lbs / 2.03 kg
Case D - Models & Ratings

Output
Voltage
Current Rating
Model Number
5 V
12.00 A
IHD5-12/OVP(5)
24 V
4.80 A

(Click here to View Dimensions)		  
Notes
1. Adjustment range potentionmeter. 4. No cover available
2. Contact office for adjustment details. 5. Remote sense fitted.
3. Models with -S are terminated with screw terminals at the output. 6. Isolate Output
All other models are terminated with solder turrets 7. Comes factory set at ± 12 v for


Application Notes - Overvoltage Protection (OVP)

An overvoltage protection circuit, commonly referred to as a crowbar, is used to prevent damage to
voltage senstive loads such as TTL logic.  The trip point of the OVP is usually set at 115% - 135% of
the output voltage.  The OVP will short the output terminals upon sensing a fault condition.  The
primary fuse of the supply will blow if the supply is not foldback current limted.  Nuisance tripping of the
OVP is a common problem.  Noise from input line spikes or load noise can cause an OVP to fire.  

The IH series has OVP noise filtering to prevent nuisance tripping and reduced transformer interwinding
capacitance to minimise input line susceptibility. The majority of 5 V outputs have OVP fitted as standard
see tables. N.B not available with cover fitted.

OVP SELECTION GUIDE
Model
Case Size
OVP Modules Requires
Single Output
B, C, N, D
IOVP-12
Single Output
E,F
IOVP-25
Dual Output
AA, BB
IOVP-12 protects both outpus OVP built-in on 5 V outputs
Dual Output
CC
IOVP-24 protects both outputs
Triple Output
AA,D
IOVP-12 protects both 9 V through 15 V outputs
built-in on main 5 V outputs

AC Connection and fusing

The five wire input provides four voltages range: 100/120/220/230-240* +10% -13%.  See chassis AC
connection table for the jumpering requirements.  Extended low line tolerance provides additional drop
out margin in areas where line voltages are marginal.  Inputs must be fused,  see markings on unit
chassis for individual model fuse rating.  Input terminal accept 0.110 x 0.032 " fast-on solder
connection.

AC CONNECTION TABLE (AC Input: 46-63 Hz)
For use at
100 V
120 V
220 V
230/240 V
Jumper
1 & 3
2 & 4

1 & 3
2 & 4
2 & 3
2 & 3
Apply A.C
1 & 5
4 & 1
1 & 5
4 & 1
                                                                * Tolerance for 230 V AC operation is +15%, -10%.

-5 Volt Sub- Regulator Module

The IAR5-0.6/OVP can be used to provide a regulated -5 VDC 0.6 A outputs when connected to any
filtered source between -7 and -30volts.  It can be fitted to IH series units using the OVP mounting
holes.  (not available with cover fitted.)