Bosch Appliances DS938Z Feature Selection, LED Operation, Sensitivity Selection, Signal Gain

1	2	3	4	5	6	7
–	+
6 to 15			Alarm		TAMPER
VDC
			RELAY

Figure 3.1: Wiring to terminals

8

TROUBLE

KEY GUIDE

INTERFACE

PINS

•Standard Sensitivity: Tolerates environment extremes on this setting, but requires the largest amount of intruder motion to achieve an alarm.

•Intermediate Sensitivity: The recommended setting for most instal- lations. Use in locations where an intruder is expected to cover only a small portion of the protected area. Tolerates normal environments on this setting. The detector is shipped in Intermediate Sensitivity mode.

•High Sensitivity: The setting for fast response to intruder signals. For use only in extremely quiet environments where ceiling drafts, and thermal and illumination transients are not anticipated.

If both switches are in the OFF position, the unit will default to the inter- mediate setting.

Terminals 1 (-) & 2 (+): Power contacts.

Terminals 3 (NO), 4 (C), & 5 (NC): Alarm relay contacts. Use terminals 4

&5 for Normally Closed circuits. Do not use with capacitive or inductive loads.

Terminals 6 (T) & 7 (T): Normally Closed tamper contacts.

Terminal 8 (TR): Solid state Trouble output. Shorts to ground (-) when the detector is in a Trouble condition.

4 Feature Selection

The DS938Z has several features that are controlled using the configuration switches.

	Motion	4 ON	and	5 OFF	=	4 Day
		4 OFF	and	5 ON	=	30 Day
	Monitor
		4 OFF	and	5 OFF	= Disabled
	Sensitivity	2 ON	and	3 OFF	= High
		2 OFF	and	3 ON	= Intermediate
		2 ON	and	3 ON	= Standard
		1 ON	=	ON
		1 OFF	=	OFF		} }
						OPEN
Figure 4.1: Selecting features
4.1 LED Operation
ON:	Allows the Alarm/Test LED to operate when activated by
	motion.

OFF: The LED will not operate on alarm activation, but will indicate a supervision trouble condition.

4.2 Sensitivity Selection

Sensitivity modes depend on the type of coverage desired and the installa- tion environment.

NOTICE!

Although the sensitivity modes provide different degrees of tolerance to environmentally caused alarms, the installer should assure peak background noise voltage readings do not exceed ±0.15 VDC. (See Section 8.0 Final Tests).

4.3 Signal Gain

The DS938Z permits selection of the signal gain depending upon the environment to be protected. The gain select jumper is located under the optical module. Refer to Figure 2.3.

•High Gain: Recommended for large coverage applications up to 60 ft. (18.3 m) in diameter. The DS938Z is shipped in this setting. If

the gain select jumper is missing, the unit will default to High Gain.

•Low Gain: Recommended for applications where the area to be cov- ered is 40 ft. (12.2 m) or less in diameter and for applications where High Gain may be too sensitive for environmental extremes.

NOTICE!

Setting the DS938Z for Low Gain reduces the coverage area to 40 ft. (12.2 m) in diameter.

5 Setup and Walk Testing

1.Attach a TC6000 Test Cord to the Noise Voltage terminals. Since the outside terminals are common, polarity is not important and the black lead may be toward or away from the optical module.

2.Attach a Sonalert to the sounder pins at this time if one will be used during walk testing.

6 © 2012 Bosch Security Systems, Inc. F.01U.263.663 01 05.2012 7