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MODEL 155 GENERAL PURPOSE TRANSDUCER MONITOR/ALARM SYSTEM

Description

The Model 155 assembly consists of eight
single-channel signal conditioner cards and
four dual-channel alarm cards. The unit
monitors acceleration, velocity, displacement, pressure, or any other critical parameter and provides AC voltage, DC voltage and
4-20mA current outputs. Two setpoints per
signal are settable on the alarm cards, which
will hold an over- or under-setpoint alarm condition until reset. Alarms can drive external relays for signaling purposes.

Specifications

Signal Card

Input: Voltage, from accelerometer or other transducer;
4-20mA loop can also be monitored

Input monitor: Card-mounted BNC allows temporary direct connection to hardwired accelerometer with other monitoring/logging equipment

Accel excitation: 4mA ±2% at 24VDC to input connection; switchable on/off; -24VDC available on input terminal block

Input gain: 0.1, 1.0, or 10, jumper selectable

Lowpass filter: 15kHz, or customer specified

Highpass filter: 15Hz, or customer specified

Integration: Zero, one, or two stages of integration, with unity gain at 307Hz or customer specified frequency

Output gain: 1.0, 10, or 100, jumper selectable;
10:1 attenuation trimpot adjustment

Outputs:	Buffered input signal, after input gain stage
	Filtered output, after input gain and high/lowpass filtering
	DC output, from optional integration stages
	4-20mA current loop output, from DC output; 0-600 ohms load resistance

Fault indication: If accelerometer input is open/ shorted
or excitation is off, output is clamped to zero and sensor fault LED lights

Alarm Card

Input signal: DC output from signal card; can be acceleration, velocity, displacement, or other signal

Level 1 alarm: Trips when input goes above or below (jumper selectable) trimpot settable level; lights yellow Warning LED after 10 second nuisance delay

Level 2 alarm: Trips when input goes above or below (jumper selectable) trimpot settable level; closes relay contact and lights red Alarm LED after 5 second nuisance delay

External relays: Provision to drive external relays on Warning and Alarm trips

Monitor voltage: One pushbutton per setpoint adjustment connects setpoint voltage to monitoring terminal block for voltmeter connection; when neither button is pressed, buffered input voltage is passed to monitor connection

Channel reset: One pushbutton per channel resets Warning and Alarm trips; both alarms light for nuisance delay time when button is pressed; any channels still in an alarmable state will remain set; also activated at system powerup

Enclosure

Cabinet: NEMA-rated steel box, 14" high x 12" wide x 6.5" deep

Connections: Alarm card voltage outputs and Alarm relay contacts on terminal blocks; buffered input signals on BNC connectors

Master reset input: Activates all alarm channel resets at once

Voltmeter: Optional LCD voltmeter and channel select switch allows monitoring of signal card output levels and alarm setpoints

Power: 115VAC ±10%, 50/60Hz to terminal block

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