Grieve Corporation B856-501 Service Manual

Introduction

An excellent value in its class, the B856 features a compact 1/16 DIN package, the
precision of digital setting, versatile functionality, and a straightforward button-per­digit interface.

It can be easily programmed to perform any standard timing operation: On-Delay, Off­Delay, Interval 1, Interval 2, or Repeat Cycle. A unique On-Delay /Interval Mode can in
many cases perform the function of two separate timers. Output is via DPDT relay
contacts.

Five selectable time ranges and a programmable decimal point provide preset times
ranging from .01 seconds to 9999 hours.

Simplicity of operation is maintained while still providing a high level of functionality. All
programming is done through the front panel, with an intuitive button-per-digit keypad
that makes entry of preset times quick and easy. A crisp dual line LCD display lets the
operator readily view elapsed or remaining cycle time as well as the preset value.
Prominent annunciators indicate
information such as the time range and the
status of the input and outputs.

Reliability is a key feature of the B856. IEC
Level 4 noise immunity ensures flawless
operation in harsh electrical environments,
while its IEC IP65 enclosure rating allows
use in washdown conditions.

Technical Manual
702096-0001

Wiring via an industry standard 8 pin
socket and a power supply that can
accept 24 - 240 VAC or 24 VDC vastly
simplify setup.

Features

• Field programmable choice of 6 operating
modes

• 5 selectable time ranges with resolution down
to 0.01 seconds

• High Contrast LCD display indicates both
process time and preset value

• Simple button per digit interface

• Programmable security levels prevent
unauthorized setpoint or program changes

• Universal Power Supply (24 - 240 VAC,
24 VDC)

• External Start and Reset Inputs

• IEC IP65 rated front panel

Index

Overview

Panel Mounting page 2
Wiring Connections page 2
Front Panel Operation page 2

Programming

Program Mode page 3-4

Operating Modes

Timing Diagrams page 5

General

Specifications page 8
Ordering Information page 8
Warranty page 8

Eagle Signal

brand

Model B856-501
Multifunction
LCD Timer

OVERVIEW

INSTALLATION & WIRING

48mm

8mm

66mm
81mm

Socket

To wire the unit, an 8 pin socket is required. The unit
can then either be DIN rail mounted or panel mounted
using the supplied mounting bracket. For panel
mounting, place the unit in the cutout, then slide the
bracket forward over the rear of the unit so that the
tabs catch in the grooves on the housing and the
bracket is as far forward as possible. Tighten the
panel mount screws until there is a snug fit against
the panel. Do not overtighten.

Start

Reset

4

5

3

2

1

–

Power*

6
7

8

+

* 24–240 VAC

or

24 VDC

FRONT PANEL OPERATION

I/O Status Indicators

Illuminates to display when an input or
output is active: "IN' for the start input,
"OUT" for the timed output, and "RST" for the
external reset signal.

Time Indicators

The word "Timing" Flashes when a timing
function is taking place. The applicable
arrow also lights to indicate if the display is
set to time up or time down.

Time Value

Indicates the elapsed/remaining time to
preset.

Edit Key

Many of the parameters in Program Mode require selection of a
specific choice as opposed to a numeric value. The Edit key is
used to scroll through the available choices. In Operation mode,
the Edit key can be pressed simultaneously with the Program key to
reset the timer.

EAGLE SIGNAL

IN
OUT

RST

1234

Timing

H
M

1234

4 3 2 1

E

Program Key

Pressing the key continuously for 3 seconds moves the unit in and
out of Program mode. Once in Program mode, pressing and
releasing the key will scroll the display from one parameter to the
next.

Time Range Indicator

Illuminates to show the time base: H for
hours, M for minutes, S for seconds.
Multiple indicators will be illuminated
when the time base is Hours:Minutes or

H
M
S

P

Minutes:Seconds.

Set Value

Settable value used to trigger the timed
output.

Numeric Keys

Each of the number keys is used to
increment or decrement the value of the
corresponding digit of the preset or a
parameter value (increments if unit is set
in time up mode and decrements if set in
time down mode).

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PROGRAMMING

PROGRAM MODE

• Enter the Program Mode by holding down the "P" key for 3 seconds

• Press the "P" key to move the top display from one parameter to the next

• Press the "E" key to scroll the bottom display through the available choices for that parameter

• While in Program Mode the unit will stop timing and the output will retain its last state. The new
settings will only become effective after returning to Operation Mode by holding down the "P" key
for 3 seconds

P

For 3 Seconds

Operating Function: Determines how outputs will operate in relation to the set value. Choices are:

Func

OndL

P

See Appendix A for timing charts

• On-Delay (OndL)

• Off Delay (OFdL)

• Interval 1 (int1)

• Interval 2 (int2)

• Delay/Interval (dint)

• Repeat Cycle (CYCL)

1St

On

P

int

1.0

S

P

trnG

S

P

dEcP

0

S

First Operation: Determines whether the Repeat Cycle will start with an On or an Off Operation

Note: This parameter will only appear if Repeat Cycle is chosen as the Operating
Function

Interval Time: Sets the amount of time the output will be active after the On-Delay function has timed
out. Use the 1 through 4 keys to set the value in a range from 0.1 to 999.9 seconds.

Note: This parameter will only appear if Delay/Interval is chosen as the Operating
Function

Time Range: Sets the unit of measure for the time values that will be shown on the display in Operation
Mode. Choices are:

• Seconds

• Minutes

• Hours

• Minutes:Seconds

• Hours:Minutes

Decimal Position: Sets the decimal position for the time display. Choices are: no decimal point (0),
1/10ths position (0.0), or Hundredths position (0.00). The time range selected in the previous
parameter will remain illuminated for reference.

Note: This parameter will not appear if Minutes:Seconds or Hours:Minutes is
selected as the time range

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